1 /*
   2  * Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import java.io.*;
  28 import java.lang.reflect.Executable;
  29 import java.lang.annotation.Annotation;
  30 import java.security.AccessControlContext;
  31 import java.util.Properties;
  32 import java.util.PropertyPermission;
  33 import java.util.StringTokenizer;
  34 import java.util.Map;
  35 import java.security.AccessController;
  36 import java.security.PrivilegedAction;
  37 import java.security.AllPermission;
  38 import java.nio.channels.Channel;
  39 import java.nio.channels.spi.SelectorProvider;
  40 import sun.nio.ch.Interruptible;
  41 import sun.reflect.CallerSensitive;
  42 import sun.reflect.Reflection;
  43 import sun.security.util.SecurityConstants;
  44 import sun.reflect.annotation.AnnotationType;
  45 
  46 /**
  47  * The <code>System</code> class contains several useful class fields
  48  * and methods. It cannot be instantiated.
  49  *
  50  * <p>Among the facilities provided by the <code>System</code> class
  51  * are standard input, standard output, and error output streams;
  52  * access to externally defined properties and environment
  53  * variables; a means of loading files and libraries; and a utility
  54  * method for quickly copying a portion of an array.
  55  *
  56  * @author  unascribed
  57  * @since   1.0
  58  */
  59 public final class System {
  60 
  61     /* register the natives via the static initializer.
  62      *
  63      * VM will invoke the initializeSystemClass method to complete
  64      * the initialization for this class separated from clinit.
  65      * Note that to use properties set by the VM, see the constraints
  66      * described in the initializeSystemClass method.
  67      */
  68     private static native void registerNatives();
  69     static {
  70         registerNatives();
  71     }
  72 
  73     /** Don't let anyone instantiate this class */
  74     private System() {
  75     }
  76 
  77     /**
  78      * The "standard" input stream. This stream is already
  79      * open and ready to supply input data. Typically this stream
  80      * corresponds to keyboard input or another input source specified by
  81      * the host environment or user.
  82      */
  83     public final static InputStream in = null;
  84 
  85     /**
  86      * The "standard" output stream. This stream is already
  87      * open and ready to accept output data. Typically this stream
  88      * corresponds to display output or another output destination
  89      * specified by the host environment or user.
  90      * <p>
  91      * For simple stand-alone Java applications, a typical way to write
  92      * a line of output data is:
  93      * <blockquote><pre>
  94      *     System.out.println(data)
  95      * </pre></blockquote>
  96      * <p>
  97      * See the <code>println</code> methods in class <code>PrintStream</code>.
  98      *
  99      * @see     java.io.PrintStream#println()
 100      * @see     java.io.PrintStream#println(boolean)
 101      * @see     java.io.PrintStream#println(char)
 102      * @see     java.io.PrintStream#println(char[])
 103      * @see     java.io.PrintStream#println(double)
 104      * @see     java.io.PrintStream#println(float)
 105      * @see     java.io.PrintStream#println(int)
 106      * @see     java.io.PrintStream#println(long)
 107      * @see     java.io.PrintStream#println(java.lang.Object)
 108      * @see     java.io.PrintStream#println(java.lang.String)
 109      */
 110     public final static PrintStream out = null;
 111 
 112     /**
 113      * The "standard" error output stream. This stream is already
 114      * open and ready to accept output data.
 115      * <p>
 116      * Typically this stream corresponds to display output or another
 117      * output destination specified by the host environment or user. By
 118      * convention, this output stream is used to display error messages
 119      * or other information that should come to the immediate attention
 120      * of a user even if the principal output stream, the value of the
 121      * variable <code>out</code>, has been redirected to a file or other
 122      * destination that is typically not continuously monitored.
 123      */
 124     public final static PrintStream err = null;
 125 
 126     /* The security manager for the system.
 127      */
 128     private static volatile SecurityManager security = null;
 129 
 130     /**
 131      * Reassigns the "standard" input stream.
 132      *
 133      * <p>First, if there is a security manager, its <code>checkPermission</code>
 134      * method is called with a <code>RuntimePermission("setIO")</code> permission
 135      *  to see if it's ok to reassign the "standard" input stream.
 136      *
 137      * @param in the new standard input stream.
 138      *
 139      * @throws SecurityException
 140      *        if a security manager exists and its
 141      *        <code>checkPermission</code> method doesn't allow
 142      *        reassigning of the standard input stream.
 143      *
 144      * @see SecurityManager#checkPermission
 145      * @see java.lang.RuntimePermission
 146      *
 147      * @since   1.1
 148      */
 149     public static void setIn(InputStream in) {
 150         checkIO();
 151         setIn0(in);
 152     }
 153 
 154     /**
 155      * Reassigns the "standard" output stream.
 156      *
 157      * <p>First, if there is a security manager, its <code>checkPermission</code>
 158      * method is called with a <code>RuntimePermission("setIO")</code> permission
 159      *  to see if it's ok to reassign the "standard" output stream.
 160      *
 161      * @param out the new standard output stream
 162      *
 163      * @throws SecurityException
 164      *        if a security manager exists and its
 165      *        <code>checkPermission</code> method doesn't allow
 166      *        reassigning of the standard output stream.
 167      *
 168      * @see SecurityManager#checkPermission
 169      * @see java.lang.RuntimePermission
 170      *
 171      * @since   1.1
 172      */
 173     public static void setOut(PrintStream out) {
 174         checkIO();
 175         setOut0(out);
 176     }
 177 
 178     /**
 179      * Reassigns the "standard" error output stream.
 180      *
 181      * <p>First, if there is a security manager, its <code>checkPermission</code>
 182      * method is called with a <code>RuntimePermission("setIO")</code> permission
 183      *  to see if it's ok to reassign the "standard" error output stream.
 184      *
 185      * @param err the new standard error output stream.
 186      *
 187      * @throws SecurityException
 188      *        if a security manager exists and its
 189      *        <code>checkPermission</code> method doesn't allow
 190      *        reassigning of the standard error output stream.
 191      *
 192      * @see SecurityManager#checkPermission
 193      * @see java.lang.RuntimePermission
 194      *
 195      * @since   1.1
 196      */
 197     public static void setErr(PrintStream err) {
 198         checkIO();
 199         setErr0(err);
 200     }
 201 
 202     private static volatile Console cons = null;
 203     /**
 204      * Returns the unique {@link java.io.Console Console} object associated
 205      * with the current Java virtual machine, if any.
 206      *
 207      * @return  The system console, if any, otherwise <tt>null</tt>.
 208      *
 209      * @since   1.6
 210      */
 211      public static Console console() {
 212          if (cons == null) {
 213              synchronized (System.class) {
 214                  cons = sun.misc.SharedSecrets.getJavaIOAccess().console();
 215              }
 216          }
 217          return cons;
 218      }
 219 
 220     /**
 221      * Returns the channel inherited from the entity that created this
 222      * Java virtual machine.
 223      *
 224      * <p> This method returns the channel obtained by invoking the
 225      * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel
 226      * inheritedChannel} method of the system-wide default
 227      * {@link java.nio.channels.spi.SelectorProvider} object. </p>
 228      *
 229      * <p> In addition to the network-oriented channels described in
 230      * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel
 231      * inheritedChannel}, this method may return other kinds of
 232      * channels in the future.
 233      *
 234      * @return  The inherited channel, if any, otherwise <tt>null</tt>.
 235      *
 236      * @throws  IOException
 237      *          If an I/O error occurs
 238      *
 239      * @throws  SecurityException
 240      *          If a security manager is present and it does not
 241      *          permit access to the channel.
 242      *
 243      * @since 1.5
 244      */
 245     public static Channel inheritedChannel() throws IOException {
 246         return SelectorProvider.provider().inheritedChannel();
 247     }
 248 
 249     private static void checkIO() {
 250         SecurityManager sm = getSecurityManager();
 251         if (sm != null) {
 252             sm.checkPermission(new RuntimePermission("setIO"));
 253         }
 254     }
 255 
 256     private static native void setIn0(InputStream in);
 257     private static native void setOut0(PrintStream out);
 258     private static native void setErr0(PrintStream err);
 259 
 260     /**
 261      * Sets the System security.
 262      *
 263      * <p> If there is a security manager already installed, this method first
 264      * calls the security manager's <code>checkPermission</code> method
 265      * with a <code>RuntimePermission("setSecurityManager")</code>
 266      * permission to ensure it's ok to replace the existing
 267      * security manager.
 268      * This may result in throwing a <code>SecurityException</code>.
 269      *
 270      * <p> Otherwise, the argument is established as the current
 271      * security manager. If the argument is <code>null</code> and no
 272      * security manager has been established, then no action is taken and
 273      * the method simply returns.
 274      *
 275      * @param      s   the security manager.
 276      * @exception  SecurityException  if the security manager has already
 277      *             been set and its <code>checkPermission</code> method
 278      *             doesn't allow it to be replaced.
 279      * @see #getSecurityManager
 280      * @see SecurityManager#checkPermission
 281      * @see java.lang.RuntimePermission
 282      */
 283     public static
 284     void setSecurityManager(final SecurityManager s) {
 285         try {
 286             s.checkPackageAccess("java.lang");
 287         } catch (Exception e) {
 288             // no-op
 289         }
 290         setSecurityManager0(s);
 291     }
 292 
 293     private static synchronized
 294     void setSecurityManager0(final SecurityManager s) {
 295         SecurityManager sm = getSecurityManager();
 296         if (sm != null) {
 297             // ask the currently installed security manager if we
 298             // can replace it.
 299             sm.checkPermission(new RuntimePermission
 300                                      ("setSecurityManager"));
 301         }
 302 
 303         if ((s != null) && (s.getClass().getClassLoader() != null)) {
 304             // New security manager class is not on bootstrap classpath.
 305             // Cause policy to get initialized before we install the new
 306             // security manager, in order to prevent infinite loops when
 307             // trying to initialize the policy (which usually involves
 308             // accessing some security and/or system properties, which in turn
 309             // calls the installed security manager's checkPermission method
 310             // which will loop infinitely if there is a non-system class
 311             // (in this case: the new security manager class) on the stack).
 312             AccessController.doPrivileged(new PrivilegedAction<Object>() {
 313                 public Object run() {
 314                     s.getClass().getProtectionDomain().implies
 315                         (SecurityConstants.ALL_PERMISSION);
 316                     return null;
 317                 }
 318             });
 319         }
 320 
 321         security = s;
 322     }
 323 
 324     /**
 325      * Gets the system security interface.
 326      *
 327      * @return  if a security manager has already been established for the
 328      *          current application, then that security manager is returned;
 329      *          otherwise, <code>null</code> is returned.
 330      * @see     #setSecurityManager
 331      */
 332     public static SecurityManager getSecurityManager() {
 333         return security;
 334     }
 335 
 336     /**
 337      * Returns the current time in milliseconds.  Note that
 338      * while the unit of time of the return value is a millisecond,
 339      * the granularity of the value depends on the underlying
 340      * operating system and may be larger.  For example, many
 341      * operating systems measure time in units of tens of
 342      * milliseconds.
 343      *
 344      * <p> See the description of the class <code>Date</code> for
 345      * a discussion of slight discrepancies that may arise between
 346      * "computer time" and coordinated universal time (UTC).
 347      *
 348      * @return  the difference, measured in milliseconds, between
 349      *          the current time and midnight, January 1, 1970 UTC.
 350      * @see     java.util.Date
 351      */
 352     public static native long currentTimeMillis();
 353 
 354     /**
 355      * Returns the current value of the running Java Virtual Machine's
 356      * high-resolution time source, in nanoseconds.
 357      *
 358      * <p>This method can only be used to measure elapsed time and is
 359      * not related to any other notion of system or wall-clock time.
 360      * The value returned represents nanoseconds since some fixed but
 361      * arbitrary <i>origin</i> time (perhaps in the future, so values
 362      * may be negative).  The same origin is used by all invocations of
 363      * this method in an instance of a Java virtual machine; other
 364      * virtual machine instances are likely to use a different origin.
 365      *
 366      * <p>This method provides nanosecond precision, but not necessarily
 367      * nanosecond resolution (that is, how frequently the value changes)
 368      * - no guarantees are made except that the resolution is at least as
 369      * good as that of {@link #currentTimeMillis()}.
 370      *
 371      * <p>Differences in successive calls that span greater than
 372      * approximately 292 years (2<sup>63</sup> nanoseconds) will not
 373      * correctly compute elapsed time due to numerical overflow.
 374      *
 375      * <p>The values returned by this method become meaningful only when
 376      * the difference between two such values, obtained within the same
 377      * instance of a Java virtual machine, is computed.
 378      *
 379      * <p> For example, to measure how long some code takes to execute:
 380      *  <pre> {@code
 381      * long startTime = System.nanoTime();
 382      * // ... the code being measured ...
 383      * long estimatedTime = System.nanoTime() - startTime;}</pre>
 384      *
 385      * <p>To compare two nanoTime values
 386      *  <pre> {@code
 387      * long t0 = System.nanoTime();
 388      * ...
 389      * long t1 = System.nanoTime();}</pre>
 390      *
 391      * one should use {@code t1 - t0 < 0}, not {@code t1 < t0},
 392      * because of the possibility of numerical overflow.
 393      *
 394      * @return the current value of the running Java Virtual Machine's
 395      *         high-resolution time source, in nanoseconds
 396      * @since 1.5
 397      */
 398     public static native long nanoTime();
 399 
 400     /**
 401      * Copies an array from the specified source array, beginning at the
 402      * specified position, to the specified position of the destination array.
 403      * A subsequence of array components are copied from the source
 404      * array referenced by <code>src</code> to the destination array
 405      * referenced by <code>dest</code>. The number of components copied is
 406      * equal to the <code>length</code> argument. The components at
 407      * positions <code>srcPos</code> through
 408      * <code>srcPos+length-1</code> in the source array are copied into
 409      * positions <code>destPos</code> through
 410      * <code>destPos+length-1</code>, respectively, of the destination
 411      * array.
 412      * <p>
 413      * If the <code>src</code> and <code>dest</code> arguments refer to the
 414      * same array object, then the copying is performed as if the
 415      * components at positions <code>srcPos</code> through
 416      * <code>srcPos+length-1</code> were first copied to a temporary
 417      * array with <code>length</code> components and then the contents of
 418      * the temporary array were copied into positions
 419      * <code>destPos</code> through <code>destPos+length-1</code> of the
 420      * destination array.
 421      * <p>
 422      * If <code>dest</code> is <code>null</code>, then a
 423      * <code>NullPointerException</code> is thrown.
 424      * <p>
 425      * If <code>src</code> is <code>null</code>, then a
 426      * <code>NullPointerException</code> is thrown and the destination
 427      * array is not modified.
 428      * <p>
 429      * Otherwise, if any of the following is true, an
 430      * <code>ArrayStoreException</code> is thrown and the destination is
 431      * not modified:
 432      * <ul>
 433      * <li>The <code>src</code> argument refers to an object that is not an
 434      *     array.
 435      * <li>The <code>dest</code> argument refers to an object that is not an
 436      *     array.
 437      * <li>The <code>src</code> argument and <code>dest</code> argument refer
 438      *     to arrays whose component types are different primitive types.
 439      * <li>The <code>src</code> argument refers to an array with a primitive
 440      *    component type and the <code>dest</code> argument refers to an array
 441      *     with a reference component type.
 442      * <li>The <code>src</code> argument refers to an array with a reference
 443      *    component type and the <code>dest</code> argument refers to an array
 444      *     with a primitive component type.
 445      * </ul>
 446      * <p>
 447      * Otherwise, if any of the following is true, an
 448      * <code>IndexOutOfBoundsException</code> is
 449      * thrown and the destination is not modified:
 450      * <ul>
 451      * <li>The <code>srcPos</code> argument is negative.
 452      * <li>The <code>destPos</code> argument is negative.
 453      * <li>The <code>length</code> argument is negative.
 454      * <li><code>srcPos+length</code> is greater than
 455      *     <code>src.length</code>, the length of the source array.
 456      * <li><code>destPos+length</code> is greater than
 457      *     <code>dest.length</code>, the length of the destination array.
 458      * </ul>
 459      * <p>
 460      * Otherwise, if any actual component of the source array from
 461      * position <code>srcPos</code> through
 462      * <code>srcPos+length-1</code> cannot be converted to the component
 463      * type of the destination array by assignment conversion, an
 464      * <code>ArrayStoreException</code> is thrown. In this case, let
 465      * <b><i>k</i></b> be the smallest nonnegative integer less than
 466      * length such that <code>src[srcPos+</code><i>k</i><code>]</code>
 467      * cannot be converted to the component type of the destination
 468      * array; when the exception is thrown, source array components from
 469      * positions <code>srcPos</code> through
 470      * <code>srcPos+</code><i>k</i><code>-1</code>
 471      * will already have been copied to destination array positions
 472      * <code>destPos</code> through
 473      * <code>destPos+</code><i>k</I><code>-1</code> and no other
 474      * positions of the destination array will have been modified.
 475      * (Because of the restrictions already itemized, this
 476      * paragraph effectively applies only to the situation where both
 477      * arrays have component types that are reference types.)
 478      *
 479      * @param      src      the source array.
 480      * @param      srcPos   starting position in the source array.
 481      * @param      dest     the destination array.
 482      * @param      destPos  starting position in the destination data.
 483      * @param      length   the number of array elements to be copied.
 484      * @exception  IndexOutOfBoundsException  if copying would cause
 485      *               access of data outside array bounds.
 486      * @exception  ArrayStoreException  if an element in the <code>src</code>
 487      *               array could not be stored into the <code>dest</code> array
 488      *               because of a type mismatch.
 489      * @exception  NullPointerException if either <code>src</code> or
 490      *               <code>dest</code> is <code>null</code>.
 491      */
 492     public static native void arraycopy(Object src,  int  srcPos,
 493                                         Object dest, int destPos,
 494                                         int length);
 495 
 496     /**
 497      * Returns the same hash code for the given object as
 498      * would be returned by the default method hashCode(),
 499      * whether or not the given object's class overrides
 500      * hashCode().
 501      * The hash code for the null reference is zero.
 502      *
 503      * @param x object for which the hashCode is to be calculated
 504      * @return  the hashCode
 505      * @since   1.1
 506      */
 507     public static native int identityHashCode(Object x);
 508 
 509     /**
 510      * System properties. The following properties are guaranteed to be defined:
 511      * <dl>
 512      * <dt>java.version         <dd>Java version number
 513      * <dt>java.vendor          <dd>Java vendor specific string
 514      * <dt>java.vendor.url      <dd>Java vendor URL
 515      * <dt>java.home            <dd>Java installation directory
 516      * <dt>java.class.version   <dd>Java class version number
 517      * <dt>java.class.path      <dd>Java classpath
 518      * <dt>os.name              <dd>Operating System Name
 519      * <dt>os.arch              <dd>Operating System Architecture
 520      * <dt>os.version           <dd>Operating System Version
 521      * <dt>file.separator       <dd>File separator ("/" on Unix)
 522      * <dt>path.separator       <dd>Path separator (":" on Unix)
 523      * <dt>line.separator       <dd>Line separator ("\n" on Unix)
 524      * <dt>user.name            <dd>User account name
 525      * <dt>user.home            <dd>User home directory
 526      * <dt>user.dir             <dd>User's current working directory
 527      * </dl>
 528      */
 529 
 530     private static Properties props;
 531     private static native Properties initProperties(Properties props);
 532 
 533     /**
 534      * Determines the current system properties.
 535      * <p>
 536      * First, if there is a security manager, its
 537      * <code>checkPropertiesAccess</code> method is called with no
 538      * arguments. This may result in a security exception.
 539      * <p>
 540      * The current set of system properties for use by the
 541      * {@link #getProperty(String)} method is returned as a
 542      * <code>Properties</code> object. If there is no current set of
 543      * system properties, a set of system properties is first created and
 544      * initialized. This set of system properties always includes values
 545      * for the following keys:
 546      * <table summary="Shows property keys and associated values">
 547      * <tr><th>Key</th>
 548      *     <th>Description of Associated Value</th></tr>
 549      * <tr><td><code>java.version</code></td>
 550      *     <td>Java Runtime Environment version</td></tr>
 551      * <tr><td><code>java.vendor</code></td>
 552      *     <td>Java Runtime Environment vendor</td></tr>
 553      * <tr><td><code>java.vendor.url</code></td>
 554      *     <td>Java vendor URL</td></tr>
 555      * <tr><td><code>java.home</code></td>
 556      *     <td>Java installation directory</td></tr>
 557      * <tr><td><code>java.vm.specification.version</code></td>
 558      *     <td>Java Virtual Machine specification version</td></tr>
 559      * <tr><td><code>java.vm.specification.vendor</code></td>
 560      *     <td>Java Virtual Machine specification vendor</td></tr>
 561      * <tr><td><code>java.vm.specification.name</code></td>
 562      *     <td>Java Virtual Machine specification name</td></tr>
 563      * <tr><td><code>java.vm.version</code></td>
 564      *     <td>Java Virtual Machine implementation version</td></tr>
 565      * <tr><td><code>java.vm.vendor</code></td>
 566      *     <td>Java Virtual Machine implementation vendor</td></tr>
 567      * <tr><td><code>java.vm.name</code></td>
 568      *     <td>Java Virtual Machine implementation name</td></tr>
 569      * <tr><td><code>java.specification.version</code></td>
 570      *     <td>Java Runtime Environment specification  version</td></tr>
 571      * <tr><td><code>java.specification.vendor</code></td>
 572      *     <td>Java Runtime Environment specification  vendor</td></tr>
 573      * <tr><td><code>java.specification.name</code></td>
 574      *     <td>Java Runtime Environment specification  name</td></tr>
 575      * <tr><td><code>java.class.version</code></td>
 576      *     <td>Java class format version number</td></tr>
 577      * <tr><td><code>java.class.path</code></td>
 578      *     <td>Java class path</td></tr>
 579      * <tr><td><code>java.library.path</code></td>
 580      *     <td>List of paths to search when loading libraries</td></tr>
 581      * <tr><td><code>java.io.tmpdir</code></td>
 582      *     <td>Default temp file path</td></tr>
 583      * <tr><td><code>java.compiler</code></td>
 584      *     <td>Name of JIT compiler to use</td></tr>
 585      * <tr><td><code>java.ext.dirs</code></td>
 586      *     <td>Path of extension directory or directories</td></tr>
 587      * <tr><td><code>os.name</code></td>
 588      *     <td>Operating system name</td></tr>
 589      * <tr><td><code>os.arch</code></td>
 590      *     <td>Operating system architecture</td></tr>
 591      * <tr><td><code>os.version</code></td>
 592      *     <td>Operating system version</td></tr>
 593      * <tr><td><code>file.separator</code></td>
 594      *     <td>File separator ("/" on UNIX)</td></tr>
 595      * <tr><td><code>path.separator</code></td>
 596      *     <td>Path separator (":" on UNIX)</td></tr>
 597      * <tr><td><code>line.separator</code></td>
 598      *     <td>Line separator ("\n" on UNIX)</td></tr>
 599      * <tr><td><code>user.name</code></td>
 600      *     <td>User's account name</td></tr>
 601      * <tr><td><code>user.home</code></td>
 602      *     <td>User's home directory</td></tr>
 603      * <tr><td><code>user.dir</code></td>
 604      *     <td>User's current working directory</td></tr>
 605      * </table>
 606      * <p>
 607      * Multiple paths in a system property value are separated by the path
 608      * separator character of the platform.
 609      * <p>
 610      * Note that even if the security manager does not permit the
 611      * <code>getProperties</code> operation, it may choose to permit the
 612      * {@link #getProperty(String)} operation.
 613      *
 614      * @return     the system properties
 615      * @exception  SecurityException  if a security manager exists and its
 616      *             <code>checkPropertiesAccess</code> method doesn't allow access
 617      *              to the system properties.
 618      * @see        #setProperties
 619      * @see        java.lang.SecurityException
 620      * @see        java.lang.SecurityManager#checkPropertiesAccess()
 621      * @see        java.util.Properties
 622      */
 623     public static Properties getProperties() {
 624         SecurityManager sm = getSecurityManager();
 625         if (sm != null) {
 626             sm.checkPropertiesAccess();
 627         }
 628 
 629         return props;
 630     }
 631 
 632     /**
 633      * Returns the system-dependent line separator string.  It always
 634      * returns the same value - the initial value of the {@linkplain
 635      * #getProperty(String) system property} {@code line.separator}.
 636      *
 637      * <p>On UNIX systems, it returns {@code "\n"}; on Microsoft
 638      * Windows systems it returns {@code "\r\n"}.
 639      *
 640      * @return the system-dependent line separator string
 641      * @since 1.7
 642      */
 643     public static String lineSeparator() {
 644         return lineSeparator;
 645     }
 646 
 647     private static String lineSeparator;
 648 
 649     /**
 650      * Sets the system properties to the <code>Properties</code>
 651      * argument.
 652      * <p>
 653      * First, if there is a security manager, its
 654      * <code>checkPropertiesAccess</code> method is called with no
 655      * arguments. This may result in a security exception.
 656      * <p>
 657      * The argument becomes the current set of system properties for use
 658      * by the {@link #getProperty(String)} method. If the argument is
 659      * <code>null</code>, then the current set of system properties is
 660      * forgotten.
 661      *
 662      * @param      props   the new system properties.
 663      * @exception  SecurityException  if a security manager exists and its
 664      *             <code>checkPropertiesAccess</code> method doesn't allow access
 665      *              to the system properties.
 666      * @see        #getProperties
 667      * @see        java.util.Properties
 668      * @see        java.lang.SecurityException
 669      * @see        java.lang.SecurityManager#checkPropertiesAccess()
 670      */
 671     public static void setProperties(Properties props) {
 672         SecurityManager sm = getSecurityManager();
 673         if (sm != null) {
 674             sm.checkPropertiesAccess();
 675         }
 676         if (props == null) {
 677             props = new Properties();
 678             initProperties(props);
 679         }
 680         System.props = props;
 681     }
 682 
 683     /**
 684      * Gets the system property indicated by the specified key.
 685      * <p>
 686      * First, if there is a security manager, its
 687      * <code>checkPropertyAccess</code> method is called with the key as
 688      * its argument. This may result in a SecurityException.
 689      * <p>
 690      * If there is no current set of system properties, a set of system
 691      * properties is first created and initialized in the same manner as
 692      * for the <code>getProperties</code> method.
 693      *
 694      * @param      key   the name of the system property.
 695      * @return     the string value of the system property,
 696      *             or <code>null</code> if there is no property with that key.
 697      *
 698      * @exception  SecurityException  if a security manager exists and its
 699      *             <code>checkPropertyAccess</code> method doesn't allow
 700      *              access to the specified system property.
 701      * @exception  NullPointerException if <code>key</code> is
 702      *             <code>null</code>.
 703      * @exception  IllegalArgumentException if <code>key</code> is empty.
 704      * @see        #setProperty
 705      * @see        java.lang.SecurityException
 706      * @see        java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
 707      * @see        java.lang.System#getProperties()
 708      */
 709     public static String getProperty(String key) {
 710         checkKey(key);
 711         SecurityManager sm = getSecurityManager();
 712         if (sm != null) {
 713             sm.checkPropertyAccess(key);
 714         }
 715 
 716         return props.getProperty(key);
 717     }
 718 
 719     /**
 720      * Gets the system property indicated by the specified key.
 721      * <p>
 722      * First, if there is a security manager, its
 723      * <code>checkPropertyAccess</code> method is called with the
 724      * <code>key</code> as its argument.
 725      * <p>
 726      * If there is no current set of system properties, a set of system
 727      * properties is first created and initialized in the same manner as
 728      * for the <code>getProperties</code> method.
 729      *
 730      * @param      key   the name of the system property.
 731      * @param      def   a default value.
 732      * @return     the string value of the system property,
 733      *             or the default value if there is no property with that key.
 734      *
 735      * @exception  SecurityException  if a security manager exists and its
 736      *             <code>checkPropertyAccess</code> method doesn't allow
 737      *             access to the specified system property.
 738      * @exception  NullPointerException if <code>key</code> is
 739      *             <code>null</code>.
 740      * @exception  IllegalArgumentException if <code>key</code> is empty.
 741      * @see        #setProperty
 742      * @see        java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
 743      * @see        java.lang.System#getProperties()
 744      */
 745     public static String getProperty(String key, String def) {
 746         checkKey(key);
 747         SecurityManager sm = getSecurityManager();
 748         if (sm != null) {
 749             sm.checkPropertyAccess(key);
 750         }
 751 
 752         return props.getProperty(key, def);
 753     }
 754 
 755     /**
 756      * Sets the system property indicated by the specified key.
 757      * <p>
 758      * First, if a security manager exists, its
 759      * <code>SecurityManager.checkPermission</code> method
 760      * is called with a <code>PropertyPermission(key, "write")</code>
 761      * permission. This may result in a SecurityException being thrown.
 762      * If no exception is thrown, the specified property is set to the given
 763      * value.
 764      *
 765      * @param      key   the name of the system property.
 766      * @param      value the value of the system property.
 767      * @return     the previous value of the system property,
 768      *             or <code>null</code> if it did not have one.
 769      *
 770      * @exception  SecurityException  if a security manager exists and its
 771      *             <code>checkPermission</code> method doesn't allow
 772      *             setting of the specified property.
 773      * @exception  NullPointerException if <code>key</code> or
 774      *             <code>value</code> is <code>null</code>.
 775      * @exception  IllegalArgumentException if <code>key</code> is empty.
 776      * @see        #getProperty
 777      * @see        java.lang.System#getProperty(java.lang.String)
 778      * @see        java.lang.System#getProperty(java.lang.String, java.lang.String)
 779      * @see        java.util.PropertyPermission
 780      * @see        SecurityManager#checkPermission
 781      * @since      1.2
 782      */
 783     public static String setProperty(String key, String value) {
 784         checkKey(key);
 785         SecurityManager sm = getSecurityManager();
 786         if (sm != null) {
 787             sm.checkPermission(new PropertyPermission(key,
 788                 SecurityConstants.PROPERTY_WRITE_ACTION));
 789         }
 790 
 791         return (String) props.setProperty(key, value);
 792     }
 793 
 794     /**
 795      * Removes the system property indicated by the specified key.
 796      * <p>
 797      * First, if a security manager exists, its
 798      * <code>SecurityManager.checkPermission</code> method
 799      * is called with a <code>PropertyPermission(key, "write")</code>
 800      * permission. This may result in a SecurityException being thrown.
 801      * If no exception is thrown, the specified property is removed.
 802      *
 803      * @param      key   the name of the system property to be removed.
 804      * @return     the previous string value of the system property,
 805      *             or <code>null</code> if there was no property with that key.
 806      *
 807      * @exception  SecurityException  if a security manager exists and its
 808      *             <code>checkPropertyAccess</code> method doesn't allow
 809      *              access to the specified system property.
 810      * @exception  NullPointerException if <code>key</code> is
 811      *             <code>null</code>.
 812      * @exception  IllegalArgumentException if <code>key</code> is empty.
 813      * @see        #getProperty
 814      * @see        #setProperty
 815      * @see        java.util.Properties
 816      * @see        java.lang.SecurityException
 817      * @see        java.lang.SecurityManager#checkPropertiesAccess()
 818      * @since 1.5
 819      */
 820     public static String clearProperty(String key) {
 821         checkKey(key);
 822         SecurityManager sm = getSecurityManager();
 823         if (sm != null) {
 824             sm.checkPermission(new PropertyPermission(key, "write"));
 825         }
 826 
 827         return (String) props.remove(key);
 828     }
 829 
 830     private static void checkKey(String key) {
 831         if (key == null) {
 832             throw new NullPointerException("key can't be null");
 833         }
 834         if (key.equals("")) {
 835             throw new IllegalArgumentException("key can't be empty");
 836         }
 837     }
 838 
 839     /**
 840      * Gets the value of the specified environment variable. An
 841      * environment variable is a system-dependent external named
 842      * value.
 843      *
 844      * <p>If a security manager exists, its
 845      * {@link SecurityManager#checkPermission checkPermission}
 846      * method is called with a
 847      * <code>{@link RuntimePermission}("getenv."+name)</code>
 848      * permission.  This may result in a {@link SecurityException}
 849      * being thrown.  If no exception is thrown the value of the
 850      * variable <code>name</code> is returned.
 851      *
 852      * <p><a name="EnvironmentVSSystemProperties"><i>System
 853      * properties</i> and <i>environment variables</i></a> are both
 854      * conceptually mappings between names and values.  Both
 855      * mechanisms can be used to pass user-defined information to a
 856      * Java process.  Environment variables have a more global effect,
 857      * because they are visible to all descendants of the process
 858      * which defines them, not just the immediate Java subprocess.
 859      * They can have subtly different semantics, such as case
 860      * insensitivity, on different operating systems.  For these
 861      * reasons, environment variables are more likely to have
 862      * unintended side effects.  It is best to use system properties
 863      * where possible.  Environment variables should be used when a
 864      * global effect is desired, or when an external system interface
 865      * requires an environment variable (such as <code>PATH</code>).
 866      *
 867      * <p>On UNIX systems the alphabetic case of <code>name</code> is
 868      * typically significant, while on Microsoft Windows systems it is
 869      * typically not.  For example, the expression
 870      * <code>System.getenv("FOO").equals(System.getenv("foo"))</code>
 871      * is likely to be true on Microsoft Windows.
 872      *
 873      * @param  name the name of the environment variable
 874      * @return the string value of the variable, or <code>null</code>
 875      *         if the variable is not defined in the system environment
 876      * @throws NullPointerException if <code>name</code> is <code>null</code>
 877      * @throws SecurityException
 878      *         if a security manager exists and its
 879      *         {@link SecurityManager#checkPermission checkPermission}
 880      *         method doesn't allow access to the environment variable
 881      *         <code>name</code>
 882      * @see    #getenv()
 883      * @see    ProcessBuilder#environment()
 884      */
 885     public static String getenv(String name) {
 886         SecurityManager sm = getSecurityManager();
 887         if (sm != null) {
 888             sm.checkPermission(new RuntimePermission("getenv."+name));
 889         }
 890 
 891         return ProcessEnvironment.getenv(name);
 892     }
 893 
 894 
 895     /**
 896      * Returns an unmodifiable string map view of the current system environment.
 897      * The environment is a system-dependent mapping from names to
 898      * values which is passed from parent to child processes.
 899      *
 900      * <p>If the system does not support environment variables, an
 901      * empty map is returned.
 902      *
 903      * <p>The returned map will never contain null keys or values.
 904      * Attempting to query the presence of a null key or value will
 905      * throw a {@link NullPointerException}.  Attempting to query
 906      * the presence of a key or value which is not of type
 907      * {@link String} will throw a {@link ClassCastException}.
 908      *
 909      * <p>The returned map and its collection views may not obey the
 910      * general contract of the {@link Object#equals} and
 911      * {@link Object#hashCode} methods.
 912      *
 913      * <p>The returned map is typically case-sensitive on all platforms.
 914      *
 915      * <p>If a security manager exists, its
 916      * {@link SecurityManager#checkPermission checkPermission}
 917      * method is called with a
 918      * <code>{@link RuntimePermission}("getenv.*")</code>
 919      * permission.  This may result in a {@link SecurityException} being
 920      * thrown.
 921      *
 922      * <p>When passing information to a Java subprocess,
 923      * <a href=#EnvironmentVSSystemProperties>system properties</a>
 924      * are generally preferred over environment variables.
 925      *
 926      * @return the environment as a map of variable names to values
 927      * @throws SecurityException
 928      *         if a security manager exists and its
 929      *         {@link SecurityManager#checkPermission checkPermission}
 930      *         method doesn't allow access to the process environment
 931      * @see    #getenv(String)
 932      * @see    ProcessBuilder#environment()
 933      * @since  1.5
 934      */
 935     public static java.util.Map<String,String> getenv() {
 936         SecurityManager sm = getSecurityManager();
 937         if (sm != null) {
 938             sm.checkPermission(new RuntimePermission("getenv.*"));
 939         }
 940 
 941         return ProcessEnvironment.getenv();
 942     }
 943 
 944     /**
 945      * Terminates the currently running Java Virtual Machine. The
 946      * argument serves as a status code; by convention, a nonzero status
 947      * code indicates abnormal termination.
 948      * <p>
 949      * This method calls the <code>exit</code> method in class
 950      * <code>Runtime</code>. This method never returns normally.
 951      * <p>
 952      * The call <code>System.exit(n)</code> is effectively equivalent to
 953      * the call:
 954      * <blockquote><pre>
 955      * Runtime.getRuntime().exit(n)
 956      * </pre></blockquote>
 957      *
 958      * @param      status   exit status.
 959      * @throws  SecurityException
 960      *        if a security manager exists and its <code>checkExit</code>
 961      *        method doesn't allow exit with the specified status.
 962      * @see        java.lang.Runtime#exit(int)
 963      */
 964     public static void exit(int status) {
 965         Runtime.getRuntime().exit(status);
 966     }
 967 
 968     /**
 969      * Runs the garbage collector.
 970      * <p>
 971      * Calling the <code>gc</code> method suggests that the Java Virtual
 972      * Machine expend effort toward recycling unused objects in order to
 973      * make the memory they currently occupy available for quick reuse.
 974      * When control returns from the method call, the Java Virtual
 975      * Machine has made a best effort to reclaim space from all discarded
 976      * objects.
 977      * <p>
 978      * The call <code>System.gc()</code> is effectively equivalent to the
 979      * call:
 980      * <blockquote><pre>
 981      * Runtime.getRuntime().gc()
 982      * </pre></blockquote>
 983      *
 984      * @see     java.lang.Runtime#gc()
 985      */
 986     public static void gc() {
 987         Runtime.getRuntime().gc();
 988     }
 989 
 990     /**
 991      * Runs the finalization methods of any objects pending finalization.
 992      * <p>
 993      * Calling this method suggests that the Java Virtual Machine expend
 994      * effort toward running the <code>finalize</code> methods of objects
 995      * that have been found to be discarded but whose <code>finalize</code>
 996      * methods have not yet been run. When control returns from the
 997      * method call, the Java Virtual Machine has made a best effort to
 998      * complete all outstanding finalizations.
 999      * <p>
1000      * The call <code>System.runFinalization()</code> is effectively
1001      * equivalent to the call:
1002      * <blockquote><pre>
1003      * Runtime.getRuntime().runFinalization()
1004      * </pre></blockquote>
1005      *
1006      * @see     java.lang.Runtime#runFinalization()
1007      */
1008     public static void runFinalization() {
1009         Runtime.getRuntime().runFinalization();
1010     }
1011 
1012     /**
1013      * Enable or disable finalization on exit; doing so specifies that the
1014      * finalizers of all objects that have finalizers that have not yet been
1015      * automatically invoked are to be run before the Java runtime exits.
1016      * By default, finalization on exit is disabled.
1017      *
1018      * <p>If there is a security manager,
1019      * its <code>checkExit</code> method is first called
1020      * with 0 as its argument to ensure the exit is allowed.
1021      * This could result in a SecurityException.
1022      *
1023      * @deprecated  This method is inherently unsafe.  It may result in
1024      *      finalizers being called on live objects while other threads are
1025      *      concurrently manipulating those objects, resulting in erratic
1026      *      behavior or deadlock.
1027      * @param value indicating enabling or disabling of finalization
1028      * @throws  SecurityException
1029      *        if a security manager exists and its <code>checkExit</code>
1030      *        method doesn't allow the exit.
1031      *
1032      * @see     java.lang.Runtime#exit(int)
1033      * @see     java.lang.Runtime#gc()
1034      * @see     java.lang.SecurityManager#checkExit(int)
1035      * @since   1.1
1036      */
1037     @Deprecated
1038     public static void runFinalizersOnExit(boolean value) {
1039         Runtime.runFinalizersOnExit(value);
1040     }
1041 
1042     /**
1043      * Loads the native library specified by the filename argument.  The filename
1044      * argument must be an absolute path name.
1045      *
1046      * If the filename argument, when stripped of any platform-specific library
1047      * prefix, path, and file extension, indicates a library whose name is,
1048      * for example, L, and a native library called L is statically linked
1049      * with the VM, then the JNI_OnLoad_L function exported by the library
1050      * is invoked rather than attempting to load a dynamic library.
1051      * A filename matching the argument does not have to exist in the
1052      * file system.
1053      * See the JNI Specification for more details.
1054      *
1055      * Otherwise, the filename argument is mapped to a native library image in
1056      * an implementation-dependent manner.
1057      *
1058      * <p>
1059      * The call <code>System.load(name)</code> is effectively equivalent
1060      * to the call:
1061      * <blockquote><pre>
1062      * Runtime.getRuntime().load(name)
1063      * </pre></blockquote>
1064      *
1065      * @param      filename   the file to load.
1066      * @exception  SecurityException  if a security manager exists and its
1067      *             <code>checkLink</code> method doesn't allow
1068      *             loading of the specified dynamic library
1069      * @exception  UnsatisfiedLinkError  if either the filename is not an
1070      *             absolute path name, the native library is not statically
1071      *             linked with the VM, or the library cannot be mapped to
1072      *             a native library image by the host system.
1073      * @exception  NullPointerException if <code>filename</code> is
1074      *             <code>null</code>
1075      * @see        java.lang.Runtime#load(java.lang.String)
1076      * @see        java.lang.SecurityManager#checkLink(java.lang.String)
1077      */
1078     @CallerSensitive
1079     public static void load(String filename) {
1080         Runtime.getRuntime().load0(Reflection.getCallerClass(), filename);
1081     }
1082 
1083     /**
1084      * Loads the native library specified by the <code>libname</code>
1085      * argument.  The <code>libname</code> argument must not contain any platform
1086      * specific prefix, file extension or path. If a native library
1087      * called <code>libname</code> is statically linked with the VM, then the
1088      * JNI_OnLoad_<code>libname</code> function exported by the library is invoked.
1089      * See the JNI Specification for more details.
1090      *
1091      * Otherwise, the libname argument is loaded from a system library
1092      * location and mapped to a native library image in an implementation-
1093      * dependent manner.
1094      * <p>
1095      * The call <code>System.loadLibrary(name)</code> is effectively
1096      * equivalent to the call
1097      * <blockquote><pre>
1098      * Runtime.getRuntime().loadLibrary(name)
1099      * </pre></blockquote>
1100      *
1101      * @param      libname   the name of the library.
1102      * @exception  SecurityException  if a security manager exists and its
1103      *             <code>checkLink</code> method doesn't allow
1104      *             loading of the specified dynamic library
1105      * @exception  UnsatisfiedLinkError if either the libname argument
1106      *             contains a file path, the native library is not statically
1107      *             linked with the VM,  or the library cannot be mapped to a
1108      *             native library image by the host system.
1109      * @exception  NullPointerException if <code>libname</code> is
1110      *             <code>null</code>
1111      * @see        java.lang.Runtime#loadLibrary(java.lang.String)
1112      * @see        java.lang.SecurityManager#checkLink(java.lang.String)
1113      */
1114     @CallerSensitive
1115     public static void loadLibrary(String libname) {
1116         Runtime.getRuntime().loadLibrary0(Reflection.getCallerClass(), libname);
1117     }
1118 
1119     /**
1120      * Maps a library name into a platform-specific string representing
1121      * a native library.
1122      *
1123      * @param      libname the name of the library.
1124      * @return     a platform-dependent native library name.
1125      * @exception  NullPointerException if <code>libname</code> is
1126      *             <code>null</code>
1127      * @see        java.lang.System#loadLibrary(java.lang.String)
1128      * @see        java.lang.ClassLoader#findLibrary(java.lang.String)
1129      * @since      1.2
1130      */
1131     public static native String mapLibraryName(String libname);
1132 
1133     /**
1134      * Create PrintStream for stdout/err based on encoding.
1135      */
1136     private static PrintStream newPrintStream(FileOutputStream fos, String enc) {
1137        if (enc != null) {
1138             try {
1139                 return new PrintStream(new BufferedOutputStream(fos, 128), true, enc);
1140             } catch (UnsupportedEncodingException uee) {}
1141         }
1142         return new PrintStream(new BufferedOutputStream(fos, 128), true);
1143     }
1144 
1145 
1146     /**
1147      * Initialize the system class.  Called after thread initialization.
1148      */
1149     private static void initializeSystemClass() {
1150 
1151         // VM might invoke JNU_NewStringPlatform() to set those encoding
1152         // sensitive properties (user.home, user.name, boot.class.path, etc.)
1153         // during "props" initialization, in which it may need access, via
1154         // System.getProperty(), to the related system encoding property that
1155         // have been initialized (put into "props") at early stage of the
1156         // initialization. So make sure the "props" is available at the
1157         // very beginning of the initialization and all system properties to
1158         // be put into it directly.
1159         props = new Properties();
1160         initProperties(props);  // initialized by the VM
1161 
1162         // There are certain system configurations that may be controlled by
1163         // VM options such as the maximum amount of direct memory and
1164         // Integer cache size used to support the object identity semantics
1165         // of autoboxing.  Typically, the library will obtain these values
1166         // from the properties set by the VM.  If the properties are for
1167         // internal implementation use only, these properties should be
1168         // removed from the system properties.
1169         //
1170         // See java.lang.Integer.IntegerCache and the
1171         // sun.misc.VM.saveAndRemoveProperties method for example.
1172         //
1173         // Save a private copy of the system properties object that
1174         // can only be accessed by the internal implementation.  Remove
1175         // certain system properties that are not intended for public access.
1176         sun.misc.VM.saveAndRemoveProperties(props);
1177 
1178 
1179         lineSeparator = props.getProperty("line.separator");
1180         sun.misc.Version.init();
1181 
1182         FileInputStream fdIn = new FileInputStream(FileDescriptor.in);
1183         FileOutputStream fdOut = new FileOutputStream(FileDescriptor.out);
1184         FileOutputStream fdErr = new FileOutputStream(FileDescriptor.err);
1185         setIn0(new BufferedInputStream(fdIn));
1186         setOut0(newPrintStream(fdOut, props.getProperty("sun.stdout.encoding")));
1187         setErr0(newPrintStream(fdErr, props.getProperty("sun.stderr.encoding")));
1188 
1189         // Load the zip library now in order to keep java.util.zip.ZipFile
1190         // from trying to use itself to load this library later.
1191         loadLibrary("zip");
1192 
1193         // Setup Java signal handlers for HUP, TERM, and INT (where available).
1194         Terminator.setup();
1195 
1196         // Initialize any miscellenous operating system settings that need to be
1197         // set for the class libraries. Currently this is no-op everywhere except
1198         // for Windows where the process-wide error mode is set before the java.io
1199         // classes are used.
1200         sun.misc.VM.initializeOSEnvironment();
1201 
1202         // The main thread is not added to its thread group in the same
1203         // way as other threads; we must do it ourselves here.
1204         Thread current = Thread.currentThread();
1205         current.getThreadGroup().add(current);
1206 
1207         // register shared secrets
1208         setJavaLangAccess();
1209 
1210         // Subsystems that are invoked during initialization can invoke
1211         // sun.misc.VM.isBooted() in order to avoid doing things that should
1212         // wait until the application class loader has been set up.
1213         // IMPORTANT: Ensure that this remains the last initialization action!
1214         sun.misc.VM.booted();
1215     }
1216 
1217     private static void setJavaLangAccess() {
1218         // Allow privileged classes outside of java.lang
1219         sun.misc.SharedSecrets.setJavaLangAccess(new sun.misc.JavaLangAccess(){
1220             public sun.reflect.ConstantPool getConstantPool(Class<?> klass) {
1221                 return klass.getConstantPool();
1222             }
1223             public boolean casAnnotationType(Class<?> klass, AnnotationType oldType, AnnotationType newType) {
1224                 return klass.casAnnotationType(oldType, newType);
1225             }
1226             public AnnotationType getAnnotationType(Class<?> klass) {
1227                 return klass.getAnnotationType();
1228             }
1229             public Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap(Class<?> klass) {
1230                 return klass.getDeclaredAnnotationMap();
1231             }
1232             public byte[] getRawClassAnnotations(Class<?> klass) {
1233                 return klass.getRawAnnotations();
1234             }
1235             public byte[] getRawClassTypeAnnotations(Class<?> klass) {
1236                 return klass.getRawTypeAnnotations();
1237             }
1238             public byte[] getRawExecutableTypeAnnotations(Executable executable) {
1239                 return Class.getExecutableTypeAnnotationBytes(executable);
1240             }
1241             public <E extends Enum<E>>
1242                     E[] getEnumConstantsShared(Class<E> klass) {
1243                 return klass.getEnumConstantsShared();
1244             }
1245             public void blockedOn(Thread t, Interruptible b) {
1246                 t.blockedOn(b);
1247             }
1248             public void registerShutdownHook(int slot, boolean registerShutdownInProgress, Runnable hook) {
1249                 Shutdown.add(slot, registerShutdownInProgress, hook);
1250             }
1251             public int getStackTraceDepth(Throwable t) {
1252                 return t.getStackTraceDepth();
1253             }
1254             public StackTraceElement getStackTraceElement(Throwable t, int i) {
1255                 return t.getStackTraceElement(i);
1256             }
1257             public String newStringUnsafe(char[] chars) {
1258                 return new String(chars, true);
1259             }
1260             public Thread newThreadWithAcc(Runnable target, AccessControlContext acc) {
1261                 return new Thread(target, acc);
1262             }
1263             public void invokeFinalize(Object o) throws Throwable {
1264                 o.finalize();
1265             }
1266             public void formatUnsignedLong(long val, int shift, char[] buf, int offset, int len) {
1267                 Long.formatUnsignedLong(val, shift, buf, offset, len);
1268             }
1269             public void formatUnsignedInt(int val, int shift, char[] buf, int offset, int len) {
1270                 Integer.formatUnsignedInt(val, shift, buf, offset, len);
1271             }
1272         });
1273     }
1274 }