System class contains several useful class fields
* and methods. It cannot be instantiated.
*
* Among the facilities provided by the System class
* are standard input, standard output, and error output streams;
* access to externally defined properties and environment
* variables; a means of loading files and libraries; and a utility
* method for quickly copying a portion of an array.
*
* @author unascribed
* @since 1.0
*/
public final class System {
/* register the natives via the static initializer.
*
* VM will invoke the initializeSystemClass method to complete
* the initialization for this class separated from clinit.
* Note that to use properties set by the VM, see the constraints
* described in the initializeSystemClass method.
*/
private static native void registerNatives();
static {
registerNatives();
}
/** Don't let anyone instantiate this class */
private System() {
}
/**
* The "standard" input stream. This stream is already
* open and ready to supply input data. Typically this stream
* corresponds to keyboard input or another input source specified by
* the host environment or user.
*/
public static final InputStream in = null;
/**
* The "standard" output stream. This stream is already
* open and ready to accept output data. Typically this stream
* corresponds to display output or another output destination
* specified by the host environment or user.
*
* For simple stand-alone Java applications, a typical way to write * a line of output data is: *
* System.out.println(data)
*
* See the println methods in class PrintStream.
*
* @see java.io.PrintStream#println()
* @see java.io.PrintStream#println(boolean)
* @see java.io.PrintStream#println(char)
* @see java.io.PrintStream#println(char[])
* @see java.io.PrintStream#println(double)
* @see java.io.PrintStream#println(float)
* @see java.io.PrintStream#println(int)
* @see java.io.PrintStream#println(long)
* @see java.io.PrintStream#println(java.lang.Object)
* @see java.io.PrintStream#println(java.lang.String)
*/
public static final PrintStream out = null;
/**
* The "standard" error output stream. This stream is already
* open and ready to accept output data.
*
* Typically this stream corresponds to display output or another
* output destination specified by the host environment or user. By
* convention, this output stream is used to display error messages
* or other information that should come to the immediate attention
* of a user even if the principal output stream, the value of the
* variable out, has been redirected to a file or other
* destination that is typically not continuously monitored.
*/
public static final PrintStream err = null;
/* The security manager for the system.
*/
private static volatile SecurityManager security = null;
/**
* Reassigns the "standard" input stream.
*
*
First, if there is a security manager, its checkPermission
* method is called with a RuntimePermission("setIO") permission
* to see if it's ok to reassign the "standard" input stream.
*
* @param in the new standard input stream.
*
* @throws SecurityException
* if a security manager exists and its
* checkPermission method doesn't allow
* reassigning of the standard input stream.
*
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*
* @since 1.1
*/
public static void setIn(InputStream in) {
checkIO();
setIn0(in);
}
/**
* Reassigns the "standard" output stream.
*
*
First, if there is a security manager, its checkPermission
* method is called with a RuntimePermission("setIO") permission
* to see if it's ok to reassign the "standard" output stream.
*
* @param out the new standard output stream
*
* @throws SecurityException
* if a security manager exists and its
* checkPermission method doesn't allow
* reassigning of the standard output stream.
*
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*
* @since 1.1
*/
public static void setOut(PrintStream out) {
checkIO();
setOut0(out);
}
/**
* Reassigns the "standard" error output stream.
*
*
First, if there is a security manager, its checkPermission
* method is called with a RuntimePermission("setIO") permission
* to see if it's ok to reassign the "standard" error output stream.
*
* @param err the new standard error output stream.
*
* @throws SecurityException
* if a security manager exists and its
* checkPermission method doesn't allow
* reassigning of the standard error output stream.
*
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*
* @since 1.1
*/
public static void setErr(PrintStream err) {
checkIO();
setErr0(err);
}
private static volatile Console cons = null;
/**
* Returns the unique {@link java.io.Console Console} object associated
* with the current Java virtual machine, if any.
*
* @return The system console, if any, otherwise {@code null}.
*
* @since 1.6
*/
public static Console console() {
if (cons == null) {
synchronized (System.class) {
cons = SharedSecrets.getJavaIOAccess().console();
}
}
return cons;
}
/**
* Returns the channel inherited from the entity that created this
* Java virtual machine.
*
*
This method returns the channel obtained by invoking the * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel * inheritedChannel} method of the system-wide default * {@link java.nio.channels.spi.SelectorProvider} object.
* *In addition to the network-oriented channels described in * {@link java.nio.channels.spi.SelectorProvider#inheritedChannel * inheritedChannel}, this method may return other kinds of * channels in the future. * * @return The inherited channel, if any, otherwise {@code null}. * * @throws IOException * If an I/O error occurs * * @throws SecurityException * If a security manager is present and it does not * permit access to the channel. * * @since 1.5 */ public static Channel inheritedChannel() throws IOException { return SelectorProvider.provider().inheritedChannel(); } private static void checkIO() { SecurityManager sm = getSecurityManager(); if (sm != null) { sm.checkPermission(new RuntimePermission("setIO")); } } private static native void setIn0(InputStream in); private static native void setOut0(PrintStream out); private static native void setErr0(PrintStream err); /** * Sets the System security. * *
If there is a security manager already installed, this method first
* calls the security manager's checkPermission method
* with a RuntimePermission("setSecurityManager")
* permission to ensure it's ok to replace the existing
* security manager.
* This may result in throwing a SecurityException.
*
*
Otherwise, the argument is established as the current
* security manager. If the argument is null and no
* security manager has been established, then no action is taken and
* the method simply returns.
*
* @param s the security manager.
* @exception SecurityException if the security manager has already
* been set and its checkPermission method
* doesn't allow it to be replaced.
* @see #getSecurityManager
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*/
public static
void setSecurityManager(final SecurityManager s) {
try {
s.checkPackageAccess("java.lang");
} catch (Exception e) {
// no-op
}
setSecurityManager0(s);
}
private static synchronized
void setSecurityManager0(final SecurityManager s) {
SecurityManager sm = getSecurityManager();
if (sm != null) {
// ask the currently installed security manager if we
// can replace it.
sm.checkPermission(new RuntimePermission
("setSecurityManager"));
}
if ((s != null) && (s.getClass().getClassLoader() != null)) {
// New security manager class is not on bootstrap classpath.
// Cause policy to get initialized before we install the new
// security manager, in order to prevent infinite loops when
// trying to initialize the policy (which usually involves
// accessing some security and/or system properties, which in turn
// calls the installed security manager's checkPermission method
// which will loop infinitely if there is a non-system class
// (in this case: the new security manager class) on the stack).
AccessController.doPrivileged(new PrivilegedAction<>() {
public Object run() {
s.getClass().getProtectionDomain().implies
(SecurityConstants.ALL_PERMISSION);
return null;
}
});
}
security = s;
}
/**
* Gets the system security interface.
*
* @return if a security manager has already been established for the
* current application, then that security manager is returned;
* otherwise, null is returned.
* @see #setSecurityManager
*/
public static SecurityManager getSecurityManager() {
return security;
}
/**
* Returns the current time in milliseconds. Note that
* while the unit of time of the return value is a millisecond,
* the granularity of the value depends on the underlying
* operating system and may be larger. For example, many
* operating systems measure time in units of tens of
* milliseconds.
*
*
See the description of the class Date for
* a discussion of slight discrepancies that may arise between
* "computer time" and coordinated universal time (UTC).
*
* @return the difference, measured in milliseconds, between
* the current time and midnight, January 1, 1970 UTC.
* @see java.util.Date
*/
@HotSpotIntrinsicCandidate
public static native long currentTimeMillis();
/**
* Returns the current value of the running Java Virtual Machine's
* high-resolution time source, in nanoseconds.
*
*
This method can only be used to measure elapsed time and is * not related to any other notion of system or wall-clock time. * The value returned represents nanoseconds since some fixed but * arbitrary origin time (perhaps in the future, so values * may be negative). The same origin is used by all invocations of * this method in an instance of a Java virtual machine; other * virtual machine instances are likely to use a different origin. * *
This method provides nanosecond precision, but not necessarily * nanosecond resolution (that is, how frequently the value changes) * - no guarantees are made except that the resolution is at least as * good as that of {@link #currentTimeMillis()}. * *
Differences in successive calls that span greater than * approximately 292 years (263 nanoseconds) will not * correctly compute elapsed time due to numerical overflow. * *
The values returned by this method become meaningful only when * the difference between two such values, obtained within the same * instance of a Java virtual machine, is computed. * *
For example, to measure how long some code takes to execute: *
{@code
* long startTime = System.nanoTime();
* // ... the code being measured ...
* long elapsedNanos = System.nanoTime() - startTime;}
*
* To compare elapsed time against a timeout, use
{@code
* if (System.nanoTime() - startTime >= timeoutNanos) ...}
* instead of {@code
* if (System.nanoTime() >= startTime + timeoutNanos) ...}
* because of the possibility of numerical overflow.
*
* @return the current value of the running Java Virtual Machine's
* high-resolution time source, in nanoseconds
* @since 1.5
*/
@HotSpotIntrinsicCandidate
public static native long nanoTime();
/**
* Copies an array from the specified source array, beginning at the
* specified position, to the specified position of the destination array.
* A subsequence of array components are copied from the source
* array referenced by src to the destination array
* referenced by dest. The number of components copied is
* equal to the length argument. The components at
* positions srcPos through
* srcPos+length-1 in the source array are copied into
* positions destPos through
* destPos+length-1, respectively, of the destination
* array.
*
* If the src and dest arguments refer to the
* same array object, then the copying is performed as if the
* components at positions srcPos through
* srcPos+length-1 were first copied to a temporary
* array with length components and then the contents of
* the temporary array were copied into positions
* destPos through destPos+length-1 of the
* destination array.
*
* If dest is null, then a
* NullPointerException is thrown.
*
* If src is null, then a
* NullPointerException is thrown and the destination
* array is not modified.
*
* Otherwise, if any of the following is true, an
* ArrayStoreException is thrown and the destination is
* not modified:
*
src argument refers to an object that is not an
* array.
* dest argument refers to an object that is not an
* array.
* src argument and dest argument refer
* to arrays whose component types are different primitive types.
* src argument refers to an array with a primitive
* component type and the dest argument refers to an array
* with a reference component type.
* src argument refers to an array with a reference
* component type and the dest argument refers to an array
* with a primitive component type.
*
* Otherwise, if any of the following is true, an
* IndexOutOfBoundsException is
* thrown and the destination is not modified:
*
srcPos argument is negative.
* destPos argument is negative.
* length argument is negative.
* srcPos+length is greater than
* src.length, the length of the source array.
* destPos+length is greater than
* dest.length, the length of the destination array.
*
* Otherwise, if any actual component of the source array from
* position srcPos through
* srcPos+length-1 cannot be converted to the component
* type of the destination array by assignment conversion, an
* ArrayStoreException is thrown. In this case, let
* k be the smallest nonnegative integer less than
* length such that src[srcPos+k]
* cannot be converted to the component type of the destination
* array; when the exception is thrown, source array components from
* positions srcPos through
* srcPos+k-1
* will already have been copied to destination array positions
* destPos through
* destPos+k-1 and no other
* positions of the destination array will have been modified.
* (Because of the restrictions already itemized, this
* paragraph effectively applies only to the situation where both
* arrays have component types that are reference types.)
*
* @param src the source array.
* @param srcPos starting position in the source array.
* @param dest the destination array.
* @param destPos starting position in the destination data.
* @param length the number of array elements to be copied.
* @exception IndexOutOfBoundsException if copying would cause
* access of data outside array bounds.
* @exception ArrayStoreException if an element in the src
* array could not be stored into the dest array
* because of a type mismatch.
* @exception NullPointerException if either src or
* dest is null.
*/
@HotSpotIntrinsicCandidate
public static native void arraycopy(Object src, int srcPos,
Object dest, int destPos,
int length);
/**
* Returns the same hash code for the given object as
* would be returned by the default method hashCode(),
* whether or not the given object's class overrides
* hashCode().
* The hash code for the null reference is zero.
*
* @param x object for which the hashCode is to be calculated
* @return the hashCode
* @since 1.1
*/
@HotSpotIntrinsicCandidate
public static native int identityHashCode(Object x);
/**
* System properties. The following properties are guaranteed to be defined:
*
* First, if there is a security manager, its
* checkPropertiesAccess method is called with no
* arguments. This may result in a security exception.
*
* The current set of system properties for use by the
* {@link #getProperty(String)} method is returned as a
* Properties object. If there is no current set of
* system properties, a set of system properties is first created and
* initialized. This set of system properties always includes values
* for the following keys:
*
| Key | *Description of Associated Value |
|---|---|
java.version |
* Java Runtime Environment version |
java.vendor |
* Java Runtime Environment vendor |
java.vendor.url |
* Java vendor URL |
java.home |
* Java installation directory |
java.vm.specification.version |
* Java Virtual Machine specification version |
java.vm.specification.vendor |
* Java Virtual Machine specification vendor |
java.vm.specification.name |
* Java Virtual Machine specification name |
java.vm.version |
* Java Virtual Machine implementation version |
java.vm.vendor |
* Java Virtual Machine implementation vendor |
java.vm.name |
* Java Virtual Machine implementation name |
java.specification.version |
* Java Runtime Environment specification version |
java.specification.vendor |
* Java Runtime Environment specification vendor |
java.specification.name |
* Java Runtime Environment specification name |
java.class.version |
* Java class format version number |
java.class.path |
* Java class path |
java.library.path |
* List of paths to search when loading libraries |
java.io.tmpdir |
* Default temp file path |
java.compiler |
* Name of JIT compiler to use |
os.name |
* Operating system name |
os.arch |
* Operating system architecture |
os.version |
* Operating system version |
file.separator |
* File separator ("/" on UNIX) |
path.separator |
* Path separator (":" on UNIX) |
line.separator |
* Line separator ("\n" on UNIX) |
user.name |
* User's account name |
user.home |
* User's home directory |
user.dir |
* User's current working directory |
* Multiple paths in a system property value are separated by the path * separator character of the platform. *
* Note that even if the security manager does not permit the
* getProperties operation, it may choose to permit the
* {@link #getProperty(String)} operation.
*
* @return the system properties
* @exception SecurityException if a security manager exists and its
* checkPropertiesAccess method doesn't allow access
* to the system properties.
* @see #setProperties
* @see java.lang.SecurityException
* @see java.lang.SecurityManager#checkPropertiesAccess()
* @see java.util.Properties
*/
public static Properties getProperties() {
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPropertiesAccess();
}
return props;
}
/**
* Returns the system-dependent line separator string. It always
* returns the same value - the initial value of the {@linkplain
* #getProperty(String) system property} {@code line.separator}.
*
*
On UNIX systems, it returns {@code "\n"}; on Microsoft
* Windows systems it returns {@code "\r\n"}.
*
* @return the system-dependent line separator string
* @since 1.7
*/
public static String lineSeparator() {
return lineSeparator;
}
private static String lineSeparator;
/**
* Sets the system properties to the Properties
* argument.
*
* First, if there is a security manager, its
* checkPropertiesAccess method is called with no
* arguments. This may result in a security exception.
*
* The argument becomes the current set of system properties for use
* by the {@link #getProperty(String)} method. If the argument is
* null, then the current set of system properties is
* forgotten.
*
* @param props the new system properties.
* @exception SecurityException if a security manager exists and its
* checkPropertiesAccess method doesn't allow access
* to the system properties.
* @see #getProperties
* @see java.util.Properties
* @see java.lang.SecurityException
* @see java.lang.SecurityManager#checkPropertiesAccess()
*/
public static void setProperties(Properties props) {
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPropertiesAccess();
}
if (props == null) {
props = new Properties();
initProperties(props);
}
System.props = props;
}
/**
* Gets the system property indicated by the specified key.
*
* First, if there is a security manager, its
* checkPropertyAccess method is called with the key as
* its argument. This may result in a SecurityException.
*
* If there is no current set of system properties, a set of system
* properties is first created and initialized in the same manner as
* for the getProperties method.
*
* @param key the name of the system property.
* @return the string value of the system property,
* or null if there is no property with that key.
*
* @exception SecurityException if a security manager exists and its
* checkPropertyAccess method doesn't allow
* access to the specified system property.
* @exception NullPointerException if key is
* null.
* @exception IllegalArgumentException if key is empty.
* @see #setProperty
* @see java.lang.SecurityException
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
* @see java.lang.System#getProperties()
*/
public static String getProperty(String key) {
checkKey(key);
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPropertyAccess(key);
}
return props.getProperty(key);
}
/**
* Gets the system property indicated by the specified key.
*
* First, if there is a security manager, its
* checkPropertyAccess method is called with the
* key as its argument.
*
* If there is no current set of system properties, a set of system
* properties is first created and initialized in the same manner as
* for the getProperties method.
*
* @param key the name of the system property.
* @param def a default value.
* @return the string value of the system property,
* or the default value if there is no property with that key.
*
* @exception SecurityException if a security manager exists and its
* checkPropertyAccess method doesn't allow
* access to the specified system property.
* @exception NullPointerException if key is
* null.
* @exception IllegalArgumentException if key is empty.
* @see #setProperty
* @see java.lang.SecurityManager#checkPropertyAccess(java.lang.String)
* @see java.lang.System#getProperties()
*/
public static String getProperty(String key, String def) {
checkKey(key);
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPropertyAccess(key);
}
return props.getProperty(key, def);
}
/**
* Sets the system property indicated by the specified key.
*
* First, if a security manager exists, its
* SecurityManager.checkPermission method
* is called with a PropertyPermission(key, "write")
* permission. This may result in a SecurityException being thrown.
* If no exception is thrown, the specified property is set to the given
* value.
*
* @param key the name of the system property.
* @param value the value of the system property.
* @return the previous value of the system property,
* or null if it did not have one.
*
* @exception SecurityException if a security manager exists and its
* checkPermission method doesn't allow
* setting of the specified property.
* @exception NullPointerException if key or
* value is null.
* @exception IllegalArgumentException if key is empty.
* @see #getProperty
* @see java.lang.System#getProperty(java.lang.String)
* @see java.lang.System#getProperty(java.lang.String, java.lang.String)
* @see java.util.PropertyPermission
* @see SecurityManager#checkPermission
* @since 1.2
*/
public static String setProperty(String key, String value) {
checkKey(key);
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPermission(new PropertyPermission(key,
SecurityConstants.PROPERTY_WRITE_ACTION));
}
return (String) props.setProperty(key, value);
}
/**
* Removes the system property indicated by the specified key.
*
* First, if a security manager exists, its
* SecurityManager.checkPermission method
* is called with a PropertyPermission(key, "write")
* permission. This may result in a SecurityException being thrown.
* If no exception is thrown, the specified property is removed.
*
* @param key the name of the system property to be removed.
* @return the previous string value of the system property,
* or null if there was no property with that key.
*
* @exception SecurityException if a security manager exists and its
* checkPropertyAccess method doesn't allow
* access to the specified system property.
* @exception NullPointerException if key is
* null.
* @exception IllegalArgumentException if key is empty.
* @see #getProperty
* @see #setProperty
* @see java.util.Properties
* @see java.lang.SecurityException
* @see java.lang.SecurityManager#checkPropertiesAccess()
* @since 1.5
*/
public static String clearProperty(String key) {
checkKey(key);
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPermission(new PropertyPermission(key, "write"));
}
return (String) props.remove(key);
}
private static void checkKey(String key) {
if (key == null) {
throw new NullPointerException("key can't be null");
}
if (key.equals("")) {
throw new IllegalArgumentException("key can't be empty");
}
}
/**
* Gets the value of the specified environment variable. An
* environment variable is a system-dependent external named
* value.
*
*
If a security manager exists, its
* {@link SecurityManager#checkPermission checkPermission}
* method is called with a
* {@link RuntimePermission}("getenv."+name)
* permission. This may result in a {@link SecurityException}
* being thrown. If no exception is thrown the value of the
* variable name is returned.
*
*
System
* properties and environment variables are both
* conceptually mappings between names and values. Both
* mechanisms can be used to pass user-defined information to a
* Java process. Environment variables have a more global effect,
* because they are visible to all descendants of the process
* which defines them, not just the immediate Java subprocess.
* They can have subtly different semantics, such as case
* insensitivity, on different operating systems. For these
* reasons, environment variables are more likely to have
* unintended side effects. It is best to use system properties
* where possible. Environment variables should be used when a
* global effect is desired, or when an external system interface
* requires an environment variable (such as PATH).
*
*
On UNIX systems the alphabetic case of name is
* typically significant, while on Microsoft Windows systems it is
* typically not. For example, the expression
* System.getenv("FOO").equals(System.getenv("foo"))
* is likely to be true on Microsoft Windows.
*
* @param name the name of the environment variable
* @return the string value of the variable, or null
* if the variable is not defined in the system environment
* @throws NullPointerException if name is null
* @throws SecurityException
* if a security manager exists and its
* {@link SecurityManager#checkPermission checkPermission}
* method doesn't allow access to the environment variable
* name
* @see #getenv()
* @see ProcessBuilder#environment()
*/
public static String getenv(String name) {
SecurityManager sm = getSecurityManager();
if (sm != null) {
sm.checkPermission(new RuntimePermission("getenv."+name));
}
return ProcessEnvironment.getenv(name);
}
/**
* Returns an unmodifiable string map view of the current system environment.
* The environment is a system-dependent mapping from names to
* values which is passed from parent to child processes.
*
*
If the system does not support environment variables, an * empty map is returned. * *
The returned map will never contain null keys or values. * Attempting to query the presence of a null key or value will * throw a {@link NullPointerException}. Attempting to query * the presence of a key or value which is not of type * {@link String} will throw a {@link ClassCastException}. * *
The returned map and its collection views may not obey the * general contract of the {@link Object#equals} and * {@link Object#hashCode} methods. * *
The returned map is typically case-sensitive on all platforms. * *
If a security manager exists, its
* {@link SecurityManager#checkPermission checkPermission}
* method is called with a
* {@link RuntimePermission}("getenv.*")
* permission. This may result in a {@link SecurityException} being
* thrown.
*
*
When passing information to a Java subprocess,
* system properties
* are generally preferred over environment variables.
*
* @return the environment as a map of variable names to values
* @throws SecurityException
* if a security manager exists and its
* {@link SecurityManager#checkPermission checkPermission}
* method doesn't allow access to the process environment
* @see #getenv(String)
* @see ProcessBuilder#environment()
* @since 1.5
*/
public static java.util.Map
* Unless
*
* @see java.lang.System
* @see java.lang.System.LoggerFinder
*
* @since 9
*
*/
public interface Logger {
/**
* Message levels for the {@link Logger loggers}
* returned by the {@link LoggerFinder} service.
*
* A level has a {@linkplain #getName() name} and {@linkplain
* #getSeverity() severity}.
* Standard level values are {@link #ALL}, {@link #TRACE}, {@link #DEBUG},
* {@link #INFO}, {@link #WARNING}, {@link #ERROR}, {@link #OFF},
* by order of increasing severity.
*
* If the logger is currently enabled for the given message level
* then a message is logged that is the result produced by the
* given supplier function. Otherwise, the supplier is not operated on.
*
* @implSpec When logging is enabled for the given level, the default
* implementation for this method calls
* {@code this.log(level, (ResourceBundle)null, msgSupplier.get(), (Object[])null);}
*
* @param level the message level.
* @param msgSupplier a supplier function that produces a message.
*
* @throws NullPointerException if {@code level} is {@code null}, or if the level
* is loggable and {@code msgSupplier} is {@code null}.
*/
public default void log(Level level, Supplier
* If the logger is currently enabled for the given message level then
* a message is logged that, by default, is the result produced from
* calling toString on the given object.
* Otherwise, the object is not operated on.
*
* @implSpec When logging is enabled for the given level, the default
* implementation for this method calls
* {@code this.log(level, (ResourceBundle)null, obj.toString(), (Object[])null);}
*
* @param level the message level.
* @param obj the object to log.
*
* @throws NullPointerException if {@code level} is {@code null}, or if the level
* is loggable and {@code obj} is {@code null}.
*/
public default void log(Level level, Object obj) {
if (isLoggable(level)) {
this.log(level, (ResourceBundle) null, obj.toString(), (Object[]) null);
}
}
/**
* Logs a message associated with a given throwable.
*
* @implSpec The default implementation for this method calls
* {@code this.log(level, (ResourceBundle)null, msg, thrown);}
*
* @param level the message level.
* @param msg the string message (or a key in the message catalog, if
* this logger is a {@link
* LoggerFinder#getLocalizedLogger(java.lang.String, java.util.ResourceBundle, java.lang.Class)
* localized logger}).
* @param thrown a {@code Throwable} associated with the log message.
*
* @throws NullPointerException if {@code level} is {@code null}.
*/
public default void log(Level level, String msg, Throwable thrown) {
this.log(level, null, msg, thrown);
}
/**
* Logs a lazily supplied message associated with a given throwable.
*
* If the logger is currently enabled for the given message level
* then a message is logged that is the result produced by the
* given supplier function. Otherwise, the supplier is not operated on.
*
* @implSpec When logging is enabled for the given level, the default
* implementation for this method calls
* {@code this.log(level, (ResourceBundle)null, msgSupplier.get(), thrown);}
*
* @param level one of the message level identifiers.
* @param msgSupplier a supplier function that produces a message.
* @param thrown a {@code Throwable} associated with log message.
*
* @throws NullPointerException if {@code level} is {@code null}, or if the level
* is loggable and {@code msgSupplier} is {@code null}.
*/
public default void log(Level level, Supplier
* If the given resource bundle is non-{@code null}, the {@code msg}
* string is localized using the given resource bundle.
* Otherwise the {@code msg} string is not localized.
*
* @param level the message level.
* @param bundle a resource bundle to localize {@code msg}, can be
* {@code null}.
* @param msg the string message (or a key in the message catalog,
* if {@code bundle} is not {@code null}).
* @param thrown a {@code Throwable} associated with the log message.
*
* @throws NullPointerException if {@code level} is {@code null}.
*/
public void log(Level level, ResourceBundle bundle, String msg,
Throwable thrown);
/**
* Logs a message with resource bundle and an optional list of
* parameters.
*
* If the given resource bundle is non-{@code null}, the {@code format}
* string is localized using the given resource bundle.
* Otherwise the {@code format} string is not localized.
*
* @param level the message level.
* @param bundle a resource bundle to localize {@code format}, can be
* {@code null}.
* @param format the string message format (or a key in the message
* catalog if {@code bundle} is not {@code null}).
* @param params an optional list of parameters to the message (may be
* none).
*
* @throws NullPointerException if {@code level} is {@code null}.
*/
public void log(Level level, ResourceBundle bundle, String format,
Object... params);
}
/**
* The {@code LoggerFinder} service makes it possible to provide an
* alternate implementation for System.Loggers used in the JDK.
*
* Working with loggers obtained from the {@code LoggerFinder}
*
* The {@code LoggerFinder} class makes it possible to replace
* the logging backend through which logging events originating from
* platform classes will be routed. The backend of the default
* {@code LoggerFinder} implementation is still
* {@code java.util.logging}, but it can now be replaced by providing and
* declaring an alternate implementation of the {@code LoggerFinder}
* service.
*
* The JDK uses the {@link java.util.ServiceLoader}
* facility to locate and load a concrete implementation of the
* {@code LoggerFinder} service, from the {@linkplain
* java.lang.ClassLoader#getSystemClassLoader() System ClassLoader}.
* If no custom implementation is found the JDK will use its own default
* implementation. If more than one implementation is found, a
* {@link java.util.ServiceConfigurationError} will be thrown.
*
* Only one instance of the {@code LoggerFinder} implementation is created.
* That instance is responsible for creating, managing, and configuring
* loggers as appropriate to the underlying framework it is using.
*
* In the JDK, a platform class that needs to log messages will obtain
* a logger that will route messages to a {@link Logger Logger} instance
* obtained from one of the factory methods provided by the
* {@code LoggerFinder} implementation.
*
* {@link Logger Logger} instances obtained from the {@code
* LoggerFinder} factory methods are not directly configurable by
* the application. Configuration is the responsibility of the underlying
* logging backend, and usually requires using APIs specific to that
* backend.
*
* System loggers (loggers obtained on behalf of platform classes) are
* usually kept in a global logger tree which is separated from the
* application logger tree. It is the responsibility of the provider of
* the concrete {@code LoggerFinder} implementation to ensure that
* system loggers can not be configured by an application without proper
* permission checks, as configuration performed on system loggers usually
* affects all applications in the same Java Runtime.
*
* Default Implementation
*
* The JDK default implementation of the {@code LoggerFinder} service
* will attempt to bind to the {@linkplain java.util.logging java.logging}
* module.
* When the {@linkplain java.util.logging java.logging} module is present,
* the default implementation will return {@link Logger} instances wrapping
* instances of {@link java.util.logging.Logger java.util.logging.Logger}.
* In that case, configuration may be performed by direct access to the
* {@code java.util.logging} APIs, using {@link java.util.logging.Logger
* java.util.logging.Logger} and {@link java.util.logging.LogManager} to
* access and configure the backend loggers.
*
* Note that if an implementation of the {@code LoggerFinder} service
* interface has been found by the {@link java.util.ServiceLoader}, then
* the JDK default implementation of {@code LoggerFinder} is not used and
* configuration can only be performed through APIs provided by the backend
* framework which the custom implementation of {@code LoggerFinder} has
* plugged in.
*
* Note also that the {@linkplain java.util.logging java.logging} module
* does not directly provide an implementation of the {@code LoggerFinder}
* service. The JDK default concrete implementation of {@code LoggerFinder}
* use instead a JDK private API to bind to {@code java.util.logging}.
* This makes it possible for an application to replace the logging backend
* even when the java.logging module is present, by simply providing
* and declaring an implementation of the {@link LoggerFinder} service.
*
* Message Levels and Mapping to {@code java.util.logging}
*
* The {@link Logger.Level Logger.Level} enum defines
* a set of standard levels: {@link Logger.Level#ALL ALL},
* {@link Logger.Level#TRACE TRACE},
* {@link Logger.Level#DEBUG DEBUG},
* {@link Logger.Level#INFO INFO},
* {@link Logger.Level#WARNING WARNING},
* {@link Logger.Level#ERROR ERROR},
* and {@link Logger.Level#OFF OFF}, by order of increased severity.
*
* When the logging backend supports custom levels, how to map System.Logger
* levels to backend levels is the responsibility of the backend.
*
* When {@link java.util.logging} is the backend, System.Logger levels are
* mapped to {@linkplain java.util.logging.Level java.util.logging levels}
* as follows:
*
* Migrating From {@code java.util.logging}
*
* Usually - an application that uses a logging framework will log messages
* through a logger facade defined (or supported) by that framework.
* Applications that wish to use an external framework should log
* through the facade associated with that framework.
*
* Changing the {@code LoggerFinder} Implementation
*
* An application wishing to change the implementation of the
* {@code LoggerFinder} is expected to provide a concrete implementation
* of the {@code LoggerFinder} abstract class accessible from the
* {@linkplain java.lang.ClassLoader#getSystemClassLoader()
* System ClassLoader} and registered as a service in such a way that it
* can be located and loaded by the {@link java.util.ServiceLoader}.
* Note that because the loaded instance of {@code LoggerFinder} is
* global, it will be only looked for in the {@linkplain
* java.lang.ClassLoader#getSystemClassLoader() System ClassLoader} (and its
* parents).
*
*
* @see java.lang.System
* @see java.lang.System.Logger
*
* @since 9
*/
public static abstract class LoggerFinder {
/**
* The {@code RuntimePermission("loggerFinder")} is
* necessary to subclass and instantiate the {@code LoggerFinder} class,
* as well as to obtain loggers from an instance of that class.
*/
public static final RuntimePermission LOGGERFINDER_PERMISSION =
new RuntimePermission("loggerFinder");
/**
* Creates a new instance of {@code LoggerFinder}.
*
* Only one instance will be created.
*
* @implNote It is recommended that subclasses of {@code LoggerFinder}
* do not perform any heavy initialization in their constructor, in
* order to avoid possible risks of deadlock or class loading cycles
* during the instantiation of the provider.
*
* @throws SecurityException if the calling code does not have the
* {@code RuntimePermission("loggerFinder")}.
*/
protected LoggerFinder() {
this(checkPermission());
}
private LoggerFinder(Void unused) {
// nothing to do.
}
private static Void checkPermission() {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(LOGGERFINDER_PERMISSION);
}
return null;
}
/**
* Returns an instance of {@link Logger Logger}
* suitable for the given caller.
*
* @param name the name of the logger.
* @param caller the class for which the logger is being requested.
*
* @return a {@link Logger logger} suitable for the given caller's
* use.
* @throws SecurityException if the calling code does not have the
* {@code RuntimePermission("loggerFinder")}.
*/
public abstract Logger getLogger(String name, /* Module */ Class caller);
/**
* Returns a localizable instance of {@link Logger Logger}
* suitable for the given caller.
* The returned logger will use the provided resource bundle for
* message localization.
*
* @implSpec By default, this method calls {@link
* #getLogger(java.lang.String, java.lang.Class)
* this.getLogger(name, caller)} to obtain a logger, then wraps that
* logger in a {@link Logger} instance where all methods that do not
* take a {@link ResourceBundle} as parameter are redirected to one
* which does - passing the given {@code bundle} for
* localization. So for instance, a call to {@link
* Logger#log(Level, String) Logger.log(Level.INFO, msg)}
* will end up as a call to {@link
* Logger#log(Level, ResourceBundle, String, Object...)
* Logger.log(Level.INFO, bundle, msg, (Object[])null)} on the wrapped
* logger object.
* Note however that by default, string messages returned by {@link
* java.util.function.Supplier Supplier<String>} will not be
* localized, as it is assumed that such strings are messages which are
* already constructed, rather than keys in a resource bundle.
*
* An implementation of {@code LoggerFinder} is not
* constrained to use the default implementation of this method. In
* particular, if the underlying logging backend provides its own
* mechanism for localizing log messages, then such a
* {@code LoggerFinder} would be free to return a logger
* that makes direct use of the mechanism provided by the backend.
*
* @param name the name of the logger.
* @param bundle a resource bundle.
* @param caller the class for which the logger is being requested.
* @return an instance of {@link Logger Logger} which will use the
* provided resource bundle for message localization.
*
* @throws SecurityException if the calling code does not have the
* {@code RuntimePermission("loggerFinder")}.
*/
public Logger getLocalizedLogger(String name, ResourceBundle bundle,
/* Module */ Class caller) {
return new LocalizedLoggerWrapper<>(getLogger(name, caller), bundle);
}
/**
* Returns the loaded {@link LoggerFinder LoggerFinder} instance.
* @return the loaded {@link LoggerFinder LoggerFinder} instance.
* @throws SecurityException if the calling code does not have the
* {@code RuntimePermission("loggerFinder")}.
*/
public static LoggerFinder getLoggerFinder() {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(LOGGERFINDER_PERMISSION);
}
return LoggerFinderLoader.spi();
}
/**
* Helper class used to load the {@link LoggerFinder}.
*/
final static class LoggerFinderLoader {
private static volatile LoggerFinder spi;
private static final Object lock = new int[0];
static final Permission CLASSLOADER_PERMISSION =
SecurityConstants.GET_CLASSLOADER_PERMISSION;
static final Permission READ_PERMISSION =
new FilePermission("<
* By default, when {@link java.util.logging}
* is present, the {@code DefaultLoggerFinder} returns loggers that
* wrap {@link java.util.logging.Logger} created by the internal
* {@link sun.util.logging.internal.JdkLoggingProvider}.
* Backend loggers are obtained by
* calling {@link
* java.util.logging.LogManager#demandLoggerFor(java.lang.String, java.lang.Class)}.
* Backend loggers can be configured by direct
* use of the {@link java.util.logging} APIs.
*
* When {@link java.util.logging}
* is not present, the {@code DefaultLoggerFinder} returns
* {@linkplain sun.util.logger.SimpleConsoleLogger
* simple console loggers}.
* By default, only message of level {@code INFO} and above will be
* printed on the console.
* For compatibility reason system loggers can be configured by
* direct use of the internal {@code PlatformLogger} API.
* For application loggers however, there is no API that would allow
* the application to configure these loggers.
*
* Therefore an application that needs to configure loggers should
* either link with {@link java.util.logging} or install its own
* {@link LoggerFinder} service.
*/
final static class DefaultLoggerFinder extends LoggerFinder {
// Default JdkLoggerProvider used when no JdkLoggerProvider is
// declared as an installed service.
static final class DefaultJdkLoggerProvider extends JdkLoggerProvider {
}
private static JdkLoggerProvider loadJdkLoggerProvider() {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(LOGGERFINDER_PERMISSION);
}
final ServiceLoader
* This method calls the
* The call
* Calling the
* The call
* Calling this method suggests that the Java Virtual Machine expend
* effort toward running the
* The call If there is a security manager,
* its
* The call
* The call
* {@link #ALL} and {@link #OFF}
* are simple markers with severities mapped respectively to
* {@link java.lang.Integer#MIN_VALUE Integer.MIN_VALUE} and
* {@link java.lang.Integer#MAX_VALUE Integer.MAX_VALUE}.
*
* For convenience the severity values are mapped to corresponding
* {@link java.util.logging.Level java.util.logging.Level} severity
* values.
*
* @since 9
*
* @see java.lang.System.LoggerFinder
* @see java.lang.System.Logger
*/
public enum Level {
// for convenience, we're reusing java.util.logging.Level int values
// the mapping logic in sun.util.logging.PlatformLogger depends
// on this.
/**
* A marker to indicate that all levels are enabled.
* This level {@linkplain #getSeverity() severity} is
* {@link Integer#MIN_VALUE}.
*/
ALL(Integer.MIN_VALUE), // usually mapped to/from j.u.l.Level.ALL
/**
* {@code TRACE} level: usually used to log diagnostic information.
* This level {@linkplain #getSeverity() severity} is
* {@code 400}.
*/
TRACE(400), // usually mapped to/from j.u.l.Level.FINER
/**
* {@code DEBUG} level: usually used to log debug information traces.
* This level {@linkplain #getSeverity() severity} is
* {@code 500}.
*/
DEBUG(500), // usually mapped to/from j.u.l.Level.FINEST/FINE/CONFIG
/**
* {@code INFO} level: usually used to log information messages.
* This level {@linkplain #getSeverity() severity} is
* {@code 800}.
*/
INFO(800), // usually mapped to/from j.u.l.Level.INFO
/**
* {@code WARNING} level: usually used to log warning messages.
* This level {@linkplain #getSeverity() severity} is
* {@code 900}.
*/
WARNING(900), // usually mapped to/from j.u.l.Level.WARNING
/**
* {@code ERROR} level: usually used to log error messages.
* This level {@linkplain #getSeverity() severity} is
* {@code 1000}.
*/
ERROR(1000), // usually mapped to/from j.u.l.Level.SEVERE
/**
* A marker to indicate that all levels are disabled.
* This level {@linkplain #getSeverity() severity} is
* {@link Integer#MAX_VALUE}.
*/
OFF(Integer.MAX_VALUE); // usually mapped to/from j.u.l.Level.OFF
private final int severity;
private Level(int severity) {
this.severity = severity;
}
/**
* Returns the name of this level.
* @return this level {@linkplain #name()}.
*/
public final String getName() {
return name();
}
/**
* Returns the severity of this level.
* A higher severity means a more severe condition.
* @return this level severity.
*/
public final int getSeverity() {
return severity;
}
}
/**
* Returns the name of this logger.
*
* @return the logger name.
*/
public String getName();
/**
* Checks if a message of the given level would be logged by
* this logger.
*
* @param level the message level.
* @return {@code true} if the given message level is currently being logged.
*
* @throws NullPointerException if {@code level} is {@code null}.
*/
public boolean isLoggable(Level level);
/**
* Logs a message.
*
* @implSpec The default implementation for this method calls
* {@code this.log(level, (ResourceBundle)null, msg, (Object[])null);}
*
* @param level the message level.
* @param msg the string message (or a key in the message catalog, if
* this logger is a {@link
* LoggerFinder#getLocalizedLogger(java.lang.String, java.util.ResourceBundle, java.lang.Class)
* localized logger}).
*
* @throws NullPointerException if {@code level} is {@code null}.
*/
public default void log(Level level, String msg) {
log(level, (ResourceBundle) null, msg, (Object[]) null);
}
/**
* Logs a lazily supplied message.
*
* If the {@link java.util.logging java.logging} module is not linked
* with the application, and no service implementation for the
* {@code LoggerFinder} has been found, then the default implementation
* will return a simple logger that prints out all log messages of
* {@link java.lang.System.Logger.Level#INFO INFO}
* level and above to the console ({@code System.err}).
*
* These simple loggers are not configurable.
*
* Libraries and classes that only need loggers to produce log messages
* should therefore not attempt to configure loggers by themselves, as that
* would make them dependant from a specific implementation of the
* {@code LoggerFinder} service.
*
* {@link Logger.Level#ALL Level.ALL} and {@link Logger.Level#OFF Level.OFF}
* are simple markers with severities mapped respectively to
* {@link java.lang.Integer#MIN_VALUE Integer.MIN_VALUE} and
* {@link java.lang.Integer#MAX_VALUE Integer.MAX_VALUE}.
*
*
*
* System.Logger Levels
* {@link Logger.Level#ALL ALL}
* {@link Logger.Level#TRACE TRACE}
* {@link Logger.Level#DEBUG DEBUG}
* {@link Logger.Level#INFO INFO}
* {@link Logger.Level#WARNING WARNING}
* {@link Logger.Level#ERROR ERROR}
* {@link Logger.Level#OFF OFF}
* java.util.logging Backend
* {@link java.util.logging.Level#ALL ALL}
* {@link java.util.logging.Level#FINER FINER}
* {@link java.util.logging.Level#FINE FINE}
* {@link java.util.logging.Level#INFO INFO}
* {@link java.util.logging.Level#WARNING WARNING}
* {@link java.util.logging.Level#SEVERE SEVERE}
* {@link java.util.logging.Level#OFF OFF}
* exit method in class
* Runtime. This method never returns normally.
* System.exit(n) is effectively equivalent to
* the call:
*
*
* @param status exit status.
* @throws SecurityException
* if a security manager exists and its
* Runtime.getRuntime().exit(n)
* checkExit
* method doesn't allow exit with the specified status.
* @see java.lang.Runtime#exit(int)
*/
public static void exit(int status) {
Runtime.getRuntime().exit(status);
}
/**
* Runs the garbage collector.
* gc method suggests that the Java Virtual
* Machine expend effort toward recycling unused objects in order to
* make the memory they currently occupy available for quick reuse.
* When control returns from the method call, the Java Virtual
* Machine has made a best effort to reclaim space from all discarded
* objects.
* System.gc() is effectively equivalent to the
* call:
*
*
* @see java.lang.Runtime#gc()
*/
public static void gc() {
Runtime.getRuntime().gc();
}
/**
* Runs the finalization methods of any objects pending finalization.
*
* Runtime.getRuntime().gc()
* finalize methods of objects
* that have been found to be discarded but whose finalize
* methods have not yet been run. When control returns from the
* method call, the Java Virtual Machine has made a best effort to
* complete all outstanding finalizations.
* System.runFinalization() is effectively
* equivalent to the call:
*
*
* @see java.lang.Runtime#runFinalization()
*/
public static void runFinalization() {
Runtime.getRuntime().runFinalization();
}
/**
* Enable or disable finalization on exit; doing so specifies that the
* finalizers of all objects that have finalizers that have not yet been
* automatically invoked are to be run before the Java runtime exits.
* By default, finalization on exit is disabled.
*
*
* Runtime.getRuntime().runFinalization()
* checkExit method is first called
* with 0 as its argument to ensure the exit is allowed.
* This could result in a SecurityException.
*
* @deprecated This method is inherently unsafe. It may result in
* finalizers being called on live objects while other threads are
* concurrently manipulating those objects, resulting in erratic
* behavior or deadlock.
* @param value indicating enabling or disabling of finalization
* @throws SecurityException
* if a security manager exists and its checkExit
* method doesn't allow the exit.
*
* @see java.lang.Runtime#exit(int)
* @see java.lang.Runtime#gc()
* @see java.lang.SecurityManager#checkExit(int)
* @since 1.1
*/
@Deprecated
public static void runFinalizersOnExit(boolean value) {
Runtime.runFinalizersOnExit(value);
}
/**
* Loads the native library specified by the filename argument. The filename
* argument must be an absolute path name.
*
* If the filename argument, when stripped of any platform-specific library
* prefix, path, and file extension, indicates a library whose name is,
* for example, L, and a native library called L is statically linked
* with the VM, then the JNI_OnLoad_L function exported by the library
* is invoked rather than attempting to load a dynamic library.
* A filename matching the argument does not have to exist in the
* file system.
* See the JNI Specification for more details.
*
* Otherwise, the filename argument is mapped to a native library image in
* an implementation-dependent manner.
*
* System.load(name) is effectively equivalent
* to the call:
*
*
* @param filename the file to load.
* @exception SecurityException if a security manager exists and its
*
* Runtime.getRuntime().load(name)
* checkLink method doesn't allow
* loading of the specified dynamic library
* @exception UnsatisfiedLinkError if either the filename is not an
* absolute path name, the native library is not statically
* linked with the VM, or the library cannot be mapped to
* a native library image by the host system.
* @exception NullPointerException if filename is
* null
* @see java.lang.Runtime#load(java.lang.String)
* @see java.lang.SecurityManager#checkLink(java.lang.String)
*/
@CallerSensitive
public static void load(String filename) {
Runtime.getRuntime().load0(Reflection.getCallerClass(), filename);
}
/**
* Loads the native library specified by the libname
* argument. The libname argument must not contain any platform
* specific prefix, file extension or path. If a native library
* called libname is statically linked with the VM, then the
* JNI_OnLoad_libname function exported by the library is invoked.
* See the JNI Specification for more details.
*
* Otherwise, the libname argument is loaded from a system library
* location and mapped to a native library image in an implementation-
* dependent manner.
* System.loadLibrary(name) is effectively
* equivalent to the call
*
*
* @param libname the name of the library.
* @exception SecurityException if a security manager exists and its
*
* Runtime.getRuntime().loadLibrary(name)
* checkLink method doesn't allow
* loading of the specified dynamic library
* @exception UnsatisfiedLinkError if either the libname argument
* contains a file path, the native library is not statically
* linked with the VM, or the library cannot be mapped to a
* native library image by the host system.
* @exception NullPointerException if libname is
* null
* @see java.lang.Runtime#loadLibrary(java.lang.String)
* @see java.lang.SecurityManager#checkLink(java.lang.String)
*/
@CallerSensitive
public static void loadLibrary(String libname) {
Runtime.getRuntime().loadLibrary0(Reflection.getCallerClass(), libname);
}
/**
* Maps a library name into a platform-specific string representing
* a native library.
*
* @param libname the name of the library.
* @return a platform-dependent native library name.
* @exception NullPointerException if libname is
* null
* @see java.lang.System#loadLibrary(java.lang.String)
* @see java.lang.ClassLoader#findLibrary(java.lang.String)
* @since 1.2
*/
public static native String mapLibraryName(String libname);
/**
* Create PrintStream for stdout/err based on encoding.
*/
private static PrintStream newPrintStream(FileOutputStream fos, String enc) {
if (enc != null) {
try {
return new PrintStream(new BufferedOutputStream(fos, 128), true, enc);
} catch (UnsupportedEncodingException uee) {}
}
return new PrintStream(new BufferedOutputStream(fos, 128), true);
}
/**
* Initialize the system class. Called after thread initialization.
*/
private static void initializeSystemClass() {
// VM might invoke JNU_NewStringPlatform() to set those encoding
// sensitive properties (user.home, user.name, boot.class.path, etc.)
// during "props" initialization, in which it may need access, via
// System.getProperty(), to the related system encoding property that
// have been initialized (put into "props") at early stage of the
// initialization. So make sure the "props" is available at the
// very beginning of the initialization and all system properties to
// be put into it directly.
props = new Properties();
initProperties(props); // initialized by the VM
// There are certain system configurations that may be controlled by
// VM options such as the maximum amount of direct memory and
// Integer cache size used to support the object identity semantics
// of autoboxing. Typically, the library will obtain these values
// from the properties set by the VM. If the properties are for
// internal implementation use only, these properties should be
// removed from the system properties.
//
// See java.lang.Integer.IntegerCache and the
// sun.misc.VM.saveAndRemoveProperties method for example.
//
// Save a private copy of the system properties object that
// can only be accessed by the internal implementation. Remove
// certain system properties that are not intended for public access.
sun.misc.VM.saveAndRemoveProperties(props);
lineSeparator = props.getProperty("line.separator");
sun.misc.Version.init();
FileInputStream fdIn = new FileInputStream(FileDescriptor.in);
FileOutputStream fdOut = new FileOutputStream(FileDescriptor.out);
FileOutputStream fdErr = new FileOutputStream(FileDescriptor.err);
setIn0(new BufferedInputStream(fdIn));
setOut0(newPrintStream(fdOut, props.getProperty("sun.stdout.encoding")));
setErr0(newPrintStream(fdErr, props.getProperty("sun.stderr.encoding")));
// Load the zip library now in order to keep java.util.zip.ZipFile
// from trying to use itself to load this library later.
loadLibrary("zip");
// Setup Java signal handlers for HUP, TERM, and INT (where available).
Terminator.setup();
// Initialize any miscellaneous operating system settings that need to be
// set for the class libraries. Currently this is no-op everywhere except
// for Windows where the process-wide error mode is set before the java.io
// classes are used.
sun.misc.VM.initializeOSEnvironment();
// The main thread is not added to its thread group in the same
// way as other threads; we must do it ourselves here.
Thread current = Thread.currentThread();
current.getThreadGroup().add(current);
// register shared secrets
setJavaLangAccess();
// Subsystems that are invoked during initialization can invoke
// sun.misc.VM.isBooted() in order to avoid doing things that should
// wait until the application class loader has been set up.
// IMPORTANT: Ensure that this remains the last initialization action!
sun.misc.VM.booted();
}
private static void setJavaLangAccess() {
// Allow privileged classes outside of java.lang
SharedSecrets.setJavaLangAccess(new JavaLangAccess(){
public sun.reflect.ConstantPool getConstantPool(Class klass) {
return klass.getConstantPool();
}
public boolean casAnnotationType(Class klass, AnnotationType oldType, AnnotationType newType) {
return klass.casAnnotationType(oldType, newType);
}
public AnnotationType getAnnotationType(Class klass) {
return klass.getAnnotationType();
}
public Map