packages = new HashMap<>();
private static Void checkCreateClassLoader() {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkCreateClassLoader();
}
return null;
}
private ClassLoader(Void unused, ClassLoader parent) {
this.parent = parent;
if (ParallelLoaders.isRegistered(this.getClass())) {
parallelLockMap = new ConcurrentHashMap<>();
package2certs = new ConcurrentHashMap<>();
domains = Collections.synchronizedSet(new HashSet<>());
assertionLock = new Object();
} else {
// no finer-grained lock; lock on the classloader instance
parallelLockMap = null;
package2certs = new Hashtable<>();
domains = new HashSet<>();
assertionLock = this;
}
}
/**
* Creates a new class loader using the specified parent class loader for
* delegation.
*
* If there is a security manager, its {@link
* SecurityManager#checkCreateClassLoader()
* checkCreateClassLoader} method is invoked. This may result in
* a security exception.
*
* @param parent
* The parent class loader
*
* @throws SecurityException
* If a security manager exists and its
* checkCreateClassLoader method doesn't allow creation
* of a new class loader.
*
* @since 1.2
*/
protected ClassLoader(ClassLoader parent) {
this(checkCreateClassLoader(), parent);
}
/**
* Creates a new class loader using the ClassLoader returned by
* the method {@link #getSystemClassLoader()
* getSystemClassLoader()} as the parent class loader.
*
* If there is a security manager, its {@link
* SecurityManager#checkCreateClassLoader()
* checkCreateClassLoader} method is invoked. This may result in
* a security exception.
*
* @throws SecurityException
* If a security manager exists and its
* checkCreateClassLoader method doesn't allow creation
* of a new class loader.
*/
protected ClassLoader() {
this(checkCreateClassLoader(), getSystemClassLoader());
}
// -- Class --
/**
* Loads the class with the specified binary name.
* This method searches for classes in the same manner as the {@link
* #loadClass(String, boolean)} method. It is invoked by the Java virtual
* machine to resolve class references. Invoking this method is equivalent
* to invoking {@link #loadClass(String, boolean) loadClass(name,
* false)}.
*
* @param name
* The binary name of the class
*
* @return The resulting Class object
*
* @throws ClassNotFoundException
* If the class was not found
*/
public Class> loadClass(String name) throws ClassNotFoundException {
Thread ct = Thread.currentThread();
ClassLoader prevLoader = ct.initiatingClassLoader;
ct.initiatingClassLoader = this;
try {
return loadClass(name, false);
} catch (ClassNotFoundException e) {
if (e.getStackTraceDepth() > 0) {
throw e;
} else {
// This should not happen if class loaders follow standard
// delegation model where ClassNotFoundException(s) from parent
// loader are always swallowed and only exceptions from the
// initiating class loader are propagated, but for other
// non-standard class loaders it may happen that exceptions from
// non-initiating class-loader are propagated.
// In that case we replace such stack-less exceptions with
// normal exceptions at exit from class loading request.
throw new ClassNotFoundException(e.getMessage(), e.getException());
}
} finally {
ct.initiatingClassLoader = prevLoader;
}
}
/**
* Loads the class with the specified binary name. The
* default implementation of this method searches for classes in the
* following order:
*
*
*
* Invoke {@link #findLoadedClass(String)} to check if the class
* has already been loaded.
*
* Invoke the {@link #loadClass(String) loadClass} method
* on the parent class loader. If the parent is null the class
* loader built-in to the virtual machine is used, instead.
*
* Invoke the {@link #findClass(String)} method to find the
* class.
*
*
*
* If the class was found using the above steps, and the
* resolve flag is true, this method will then invoke the {@link
* #resolveClass(Class)} method on the resulting Class object.
*
*
Subclasses of ClassLoader are encouraged to override {@link
* #findClass(String)}, rather than this method.
*
* Unless overridden, this method synchronizes on the result of
* {@link #getClassLoadingLock getClassLoadingLock} method
* during the entire class loading process.
*
* @param name
* The binary name of the class
*
* @param resolve
* If true then resolve the class
*
* @return The resulting Class object
*
* @throws ClassNotFoundException
* If the class could not be found
*/
protected Class> loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
Object cll = getClassLoadingLock(name);
synchronized (cll) {
// First, check if the class has already been loaded
Class> c;
// Are we parallel capable and getClassLoadingLock() has
// not been overridden to supply it's own type of locks?
Lock lock = (cll instanceof Lock) ? (Lock) cll : null;
if (lock != null) { // yes
c = lock.attempted
// only invoke findLoadedClass() if loading of class
// with such name has already been attempted
? findLoadedClass(name)
// else we can be sure findLoadedClass() would
// return null and can skip invoking it
: null;
} else {
// we are not parallel capable and must always invoke
c = findLoadedClass(name);
}
if (c == null) {
long t0 = System.nanoTime();
try {
if (parent != null) {
c = parent.loadClass(name, false);
} else {
c = findBootstrapClassOrNull(name);
}
} catch (ClassNotFoundException e) {
// ClassNotFoundException thrown if class not found
// from the non-null parent class loader
}
if (c == null) {
// If still not found, then invoke findClass in order
// to find the class.
long t1 = System.nanoTime();
c = findClass(name);
// this is the defining class loader; record the stats
sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0);
sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1);
sun.misc.PerfCounter.getFindClasses().increment();
}
// if we reach here, attempt was successful - we mark that
// in our Lock so next time findLoadedClass() will be invoked
if (lock != null) {
lock.attempted = true;
}
}
if (resolve) {
resolveClass(c);
}
return c;
}
}
/**
* Returns the lock object for class loading operations.
* For backward compatibility, the default implementation of this method
* behaves as follows. If this ClassLoader object is registered as
* parallel capable, the method returns a dedicated object associated
* with the specified class name. Otherwise, the method returns this
* ClassLoader object.
*
* @param className
* The name of the to-be-loaded class
*
* @return the lock for class loading operations
*
* @throws NullPointerException
* If registered as parallel capable and className is null
*
* @see #loadClass(String, boolean)
*
* @since 1.7
*/
protected Object getClassLoadingLock(String className) {
Object lock = this;
if (parallelLockMap != null) {
Lock newLock = new Lock();
lock = parallelLockMap.putIfAbsent(className, newLock);
if (lock == null) {
lock = newLock;
}
}
return lock;
}
// This method is invoked by the virtual machine to load a class.
private Class> loadClassInternal(String name)
throws ClassNotFoundException
{
// For backward compatibility, explicitly lock on 'this' when
// the current class loader is not parallel capable.
if (parallelLockMap == null) {
synchronized (this) {
return loadClass(name);
}
} else {
return loadClass(name);
}
}
// Invoked by the VM after loading class with this loader.
private void checkPackageAccess(Class> cls, ProtectionDomain pd) {
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
if (ReflectUtil.isNonPublicProxyClass(cls)) {
for (Class> intf: cls.getInterfaces()) {
checkPackageAccess(intf, pd);
}
return;
}
final String name = cls.getName();
final int i = name.lastIndexOf('.');
if (i != -1) {
AccessController.doPrivileged(new PrivilegedAction() {
public Void run() {
sm.checkPackageAccess(name.substring(0, i));
return null;
}
}, new AccessControlContext(new ProtectionDomain[] {pd}));
}
}
domains.add(pd);
}
/**
* Finds the class with the specified binary name.
* This method should be overridden by class loader implementations that
* follow the delegation model for loading classes, and will be invoked by
* the {@link #loadClass loadClass} method after checking the
* parent class loader for the requested class. The default implementation
* throws a ClassNotFoundException.
*
* @param name
* The binary name of the class
*
* @return The resulting Class object
*
* @throws ClassNotFoundException
* If the class could not be found
*
* @since 1.2
*/
protected Class> findClass(String name) throws ClassNotFoundException {
// we only need stack trace when we're the initiating class loader.
boolean initiating = (Thread.currentThread().initiatingClassLoader == this);
throw new ClassNotFoundException(
name,
null,
initiating
);
}
/**
* Converts an array of bytes into an instance of class Class.
* Before the Class can be used it must be resolved. This method
* is deprecated in favor of the version that takes a binary name as its first argument, and is more secure.
*
* @param b
* The bytes that make up the class data. The bytes in positions
* off through off+len-1 should have the format
* of a valid class file as defined by
* The Java™ Virtual Machine Specification.
*
* @param off
* The start offset in b of the class data
*
* @param len
* The length of the class data
*
* @return The Class object that was created from the specified
* class data
*
* @throws ClassFormatError
* If the data did not contain a valid class
*
* @throws IndexOutOfBoundsException
* If either off or len is negative, or if
* off+len is greater than b.length.
*
* @throws SecurityException
* If an attempt is made to add this class to a package that
* contains classes that were signed by a different set of
* certificates than this class, or if an attempt is made
* to define a class in a package with a fully-qualified name
* that starts with "{@code java.}".
*
* @see #loadClass(String, boolean)
* @see #resolveClass(Class)
*
* @deprecated Replaced by {@link #defineClass(String, byte[], int, int)
* defineClass(String, byte[], int, int)}
*/
@Deprecated
protected final Class> defineClass(byte[] b, int off, int len)
throws ClassFormatError
{
return defineClass(null, b, off, len, null);
}
/**
* Converts an array of bytes into an instance of class Class.
* Before the Class can be used it must be resolved.
*
* This method assigns a default {@link java.security.ProtectionDomain
* ProtectionDomain} to the newly defined class. The
* ProtectionDomain is effectively granted the same set of
* permissions returned when {@link
* java.security.Policy#getPermissions(java.security.CodeSource)
* Policy.getPolicy().getPermissions(new CodeSource(null, null))}
* is invoked. The default domain is created on the first invocation of
* {@link #defineClass(String, byte[], int, int) defineClass},
* and re-used on subsequent invocations.
*
*
To assign a specific ProtectionDomain to the class, use
* the {@link #defineClass(String, byte[], int, int,
* java.security.ProtectionDomain) defineClass} method that takes a
* ProtectionDomain as one of its arguments.
*
* @param name
* The expected binary name of the class, or
* null if not known
*
* @param b
* The bytes that make up the class data. The bytes in positions
* off through off+len-1 should have the format
* of a valid class file as defined by
* The Java™ Virtual Machine Specification.
*
* @param off
* The start offset in b of the class data
*
* @param len
* The length of the class data
*
* @return The Class object that was created from the specified
* class data.
*
* @throws ClassFormatError
* If the data did not contain a valid class
*
* @throws IndexOutOfBoundsException
* If either off or len is negative, or if
* off+len is greater than b.length.
*
* @throws SecurityException
* If an attempt is made to add this class to a package that
* contains classes that were signed by a different set of
* certificates than this class (which is unsigned), or if
* name begins with "java.".
*
* @see #loadClass(String, boolean)
* @see #resolveClass(Class)
* @see java.security.CodeSource
* @see java.security.SecureClassLoader
*
* @since 1.1
*/
protected final Class> defineClass(String name, byte[] b, int off, int len)
throws ClassFormatError
{
return defineClass(name, b, off, len, null);
}
/* Determine protection domain, and check that:
- not define java.* class,
- signer of this class matches signers for the rest of the classes in
package.
*/
private ProtectionDomain preDefineClass(String name,
ProtectionDomain pd)
{
if (!checkName(name))
throw new NoClassDefFoundError("IllegalName: " + name);
if ((name != null) && name.startsWith("java.")) {
throw new SecurityException
("Prohibited package name: " +
name.substring(0, name.lastIndexOf('.')));
}
if (pd == null) {
pd = defaultDomain;
}
if (name != null) checkCerts(name, pd.getCodeSource());
return pd;
}
private String defineClassSourceLocation(ProtectionDomain pd)
{
CodeSource cs = pd.getCodeSource();
String source = null;
if (cs != null && cs.getLocation() != null) {
source = cs.getLocation().toString();
}
return source;
}
private void postDefineClass(Class> c, ProtectionDomain pd)
{
if (pd.getCodeSource() != null) {
Certificate certs[] = pd.getCodeSource().getCertificates();
if (certs != null)
setSigners(c, certs);
}
}
/**
* Converts an array of bytes into an instance of class Class,
* with an optional ProtectionDomain. If the domain is
* null, then a default domain will be assigned to the class as
* specified in the documentation for {@link #defineClass(String, byte[],
* int, int)}. Before the class can be used it must be resolved.
*
* The first class defined in a package determines the exact set of
* certificates that all subsequent classes defined in that package must
* contain. The set of certificates for a class is obtained from the
* {@link java.security.CodeSource CodeSource} within the
* ProtectionDomain of the class. Any classes added to that
* package must contain the same set of certificates or a
* SecurityException will be thrown. Note that if
* name is null, this check is not performed.
* You should always pass in the binary name of the
* class you are defining as well as the bytes. This ensures that the
* class you are defining is indeed the class you think it is.
*
*
The specified name cannot begin with "java.", since
* all classes in the "java.* packages can only be defined by the
* bootstrap class loader. If name is not null, it
* must be equal to the binary name of the class
* specified by the byte array "b", otherwise a {@link
* NoClassDefFoundError NoClassDefFoundError} will be thrown.
*
* @param name
* The expected binary name of the class, or
* null if not known
*
* @param b
* The bytes that make up the class data. The bytes in positions
* off through off+len-1 should have the format
* of a valid class file as defined by
* The Java™ Virtual Machine Specification.
*
* @param off
* The start offset in b of the class data
*
* @param len
* The length of the class data
*
* @param protectionDomain
* The ProtectionDomain of the class
*
* @return The Class object created from the data,
* and optional ProtectionDomain.
*
* @throws ClassFormatError
* If the data did not contain a valid class
*
* @throws NoClassDefFoundError
* If name is not equal to the binary
* name of the class specified by b
*
* @throws IndexOutOfBoundsException
* If either off or len is negative, or if
* off+len is greater than b.length.
*
* @throws SecurityException
* If an attempt is made to add this class to a package that
* contains classes that were signed by a different set of
* certificates than this class, or if name begins with
* "java.".
*/
protected final Class> defineClass(String name, byte[] b, int off, int len,
ProtectionDomain protectionDomain)
throws ClassFormatError
{
protectionDomain = preDefineClass(name, protectionDomain);
String source = defineClassSourceLocation(protectionDomain);
Class> c = defineClass1(name, b, off, len, protectionDomain, source);
postDefineClass(c, protectionDomain);
return c;
}
/**
* Converts a {@link java.nio.ByteBuffer ByteBuffer}
* into an instance of class Class,
* with an optional ProtectionDomain. If the domain is
* null, then a default domain will be assigned to the class as
* specified in the documentation for {@link #defineClass(String, byte[],
* int, int)}. Before the class can be used it must be resolved.
*
* The rules about the first class defined in a package determining the
* set of certificates for the package, and the restrictions on class names
* are identical to those specified in the documentation for {@link
* #defineClass(String, byte[], int, int, ProtectionDomain)}.
*
*
An invocation of this method of the form
* cl.defineClass(name,
* bBuffer, pd) yields exactly the same
* result as the statements
*
*
* ...
* byte[] temp = new byte[bBuffer.{@link
* java.nio.ByteBuffer#remaining remaining}()];
* bBuffer.{@link java.nio.ByteBuffer#get(byte[])
* get}(temp);
* return {@link #defineClass(String, byte[], int, int, ProtectionDomain)
* cl.defineClass}(name, temp, 0,
* temp.length, pd);
*
*
* @param name
* The expected binary name. of the class, or
* null if not known
*
* @param b
* The bytes that make up the class data. The bytes from positions
* b.position() through b.position() + b.limit() -1
* should have the format of a valid class file as defined by
* The Java™ Virtual Machine Specification.
*
* @param protectionDomain
* The ProtectionDomain of the class, or null.
*
* @return The Class object created from the data,
* and optional ProtectionDomain.
*
* @throws ClassFormatError
* If the data did not contain a valid class.
*
* @throws NoClassDefFoundError
* If name is not equal to the binary
* name of the class specified by b
*
* @throws SecurityException
* If an attempt is made to add this class to a package that
* contains classes that were signed by a different set of
* certificates than this class, or if name begins with
* "java.".
*
* @see #defineClass(String, byte[], int, int, ProtectionDomain)
*
* @since 1.5
*/
protected final Class> defineClass(String name, java.nio.ByteBuffer b,
ProtectionDomain protectionDomain)
throws ClassFormatError
{
int len = b.remaining();
// Use byte[] if not a direct ByteBuffer:
if (!b.isDirect()) {
if (b.hasArray()) {
return defineClass(name, b.array(),
b.position() + b.arrayOffset(), len,
protectionDomain);
} else {
// no array, or read-only array
byte[] tb = new byte[len];
b.get(tb); // get bytes out of byte buffer.
return defineClass(name, tb, 0, len, protectionDomain);
}
}
protectionDomain = preDefineClass(name, protectionDomain);
String source = defineClassSourceLocation(protectionDomain);
Class> c = defineClass2(name, b, b.position(), len, protectionDomain, source);
postDefineClass(c, protectionDomain);
return c;
}
private native Class> defineClass1(String name, byte[] b, int off, int len,
ProtectionDomain pd, String source);
private native Class> defineClass2(String name, java.nio.ByteBuffer b,
int off, int len, ProtectionDomain pd,
String source);
// true if the name is null or has the potential to be a valid binary name
private boolean checkName(String name) {
if ((name == null) || (name.length() == 0))
return true;
if ((name.indexOf('/') != -1) || (name.charAt(0) == '['))
return false;
return true;
}
private void checkCerts(String name, CodeSource cs) {
int i = name.lastIndexOf('.');
String pname = (i == -1) ? "" : name.substring(0, i);
Certificate[] certs = null;
if (cs != null) {
certs = cs.getCertificates();
}
Certificate[] pcerts = null;
if (parallelLockMap == null) {
synchronized (this) {
pcerts = package2certs.get(pname);
if (pcerts == null) {
package2certs.put(pname, (certs == null? nocerts:certs));
}
}
} else {
pcerts = ((ConcurrentHashMap)package2certs).
putIfAbsent(pname, (certs == null? nocerts:certs));
}
if (pcerts != null && !compareCerts(pcerts, certs)) {
throw new SecurityException("class \""+ name +
"\"'s signer information does not match signer information of other classes in the same package");
}
}
/**
* check to make sure the certs for the new class (certs) are the same as
* the certs for the first class inserted in the package (pcerts)
*/
private boolean compareCerts(Certificate[] pcerts,
Certificate[] certs)
{
// certs can be null, indicating no certs.
if ((certs == null) || (certs.length == 0)) {
return pcerts.length == 0;
}
// the length must be the same at this point
if (certs.length != pcerts.length)
return false;
// go through and make sure all the certs in one array
// are in the other and vice-versa.
boolean match;
for (Certificate cert : certs) {
match = false;
for (Certificate pcert : pcerts) {
if (cert.equals(pcert)) {
match = true;
break;
}
}
if (!match) return false;
}
// now do the same for pcerts
for (Certificate pcert : pcerts) {
match = false;
for (Certificate cert : certs) {
if (pcert.equals(cert)) {
match = true;
break;
}
}
if (!match) return false;
}
return true;
}
/**
* Links the specified class. This (misleadingly named) method may be
* used by a class loader to link a class. If the class c has
* already been linked, then this method simply returns. Otherwise, the
* class is linked as described in the "Execution" chapter of
* The Java™ Language Specification.
*
* @param c
* The class to link
*
* @throws NullPointerException
* If c is null.
*
* @see #defineClass(String, byte[], int, int)
*/
protected final void resolveClass(Class> c) {
resolveClass0(c);
}
private native void resolveClass0(Class> c);
/**
* Finds a class with the specified binary name,
* loading it if necessary.
*
* This method loads the class through the system class loader (see
* {@link #getSystemClassLoader()}). The Class object returned
* might have more than one ClassLoader associated with it.
* Subclasses of ClassLoader need not usually invoke this method,
* because most class loaders need to override just {@link
* #findClass(String)}.
*
* @param name
* The binary name of the class
*
* @return The Class object for the specified name
*
* @throws ClassNotFoundException
* If the class could not be found
*
* @see #ClassLoader(ClassLoader)
* @see #getParent()
*/
protected final Class> findSystemClass(String name)
throws ClassNotFoundException
{
ClassLoader system = getSystemClassLoader();
if (system == null) {
if (!checkName(name))
throw new ClassNotFoundException(name);
Class> cls = findBootstrapClass(name);
if (cls == null) {
throw new ClassNotFoundException(name);
}
return cls;
}
return system.loadClass(name);
}
/**
* Returns a class loaded by the bootstrap class loader;
* or return null if not found.
*/
private Class> findBootstrapClassOrNull(String name)
{
if (!checkName(name)) return null;
return findBootstrapClass(name);
}
// return null if not found
private native Class> findBootstrapClass(String name);
/**
* Returns the class with the given binary name if this
* loader has been recorded by the Java virtual machine as an initiating
* loader of a class with that binary name. Otherwise
* null is returned.
*
* @param name
* The binary name of the class
*
* @return The Class object, or null if the class has
* not been loaded
*
* @since 1.1
*/
protected final Class> findLoadedClass(String name) {
if (!checkName(name))
return null;
return findLoadedClass0(name);
}
private native final Class> findLoadedClass0(String name);
/**
* Sets the signers of a class. This should be invoked after defining a
* class.
*
* @param c
* The Class object
*
* @param signers
* The signers for the class
*
* @since 1.1
*/
protected final void setSigners(Class> c, Object[] signers) {
c.setSigners(signers);
}
// -- Resource --
/**
* Finds the resource with the given name. A resource is some data
* (images, audio, text, etc) that can be accessed by class code in a way
* that is independent of the location of the code.
*
* The name of a resource is a '/'-separated path name that
* identifies the resource.
*
*
This method will first search the parent class loader for the
* resource; if the parent is null the path of the class loader
* built-in to the virtual machine is searched. That failing, this method
* will invoke {@link #findResource(String)} to find the resource.
*
* @apiNote When overriding this method it is recommended that an
* implementation ensures that any delegation is consistent with the {@link
* #getResources(java.lang.String) getResources(String)} method.
*
* @param name
* The resource name
*
* @return A URL object for reading the resource, or
* null if the resource could not be found or the invoker
* doesn't have adequate privileges to get the resource.
*
* @since 1.1
*/
public URL getResource(String name) {
URL url;
if (parent != null) {
url = parent.getResource(name);
} else {
url = getBootstrapResource(name);
}
if (url == null) {
url = findResource(name);
}
return url;
}
/**
* Finds all the resources with the given name. A resource is some data
* (images, audio, text, etc) that can be accessed by class code in a way
* that is independent of the location of the code.
*
* The name of a resource is a /-separated path name that
* identifies the resource.
*
*
The search order is described in the documentation for {@link
* #getResource(String)}.
*
* @apiNote When overriding this method it is recommended that an
* implementation ensures that any delegation is consistent with the {@link
* #getResource(java.lang.String) getResource(String)} method. This should
* ensure that the first element returned by the Enumeration's
* {@code nextElement} method is the same resource that the
* {@code getResource(String)} method would return.
*
* @param name
* The resource name
*
* @return An enumeration of {@link java.net.URL URL} objects for
* the resource. If no resources could be found, the enumeration
* will be empty. Resources that the class loader doesn't have
* access to will not be in the enumeration.
*
* @throws IOException
* If I/O errors occur
*
* @see #findResources(String)
*
* @since 1.2
*/
public Enumeration getResources(String name) throws IOException {
@SuppressWarnings("unchecked")
Enumeration[] tmp = (Enumeration[]) new Enumeration>[2];
if (parent != null) {
tmp[0] = parent.getResources(name);
} else {
tmp[0] = getBootstrapResources(name);
}
tmp[1] = findResources(name);
return new CompoundEnumeration<>(tmp);
}
/**
* Finds the resource with the given name. Class loader implementations
* should override this method to specify where to find resources.
*
* @param name
* The resource name
*
* @return A URL object for reading the resource, or
* null if the resource could not be found
*
* @since 1.2
*/
protected URL findResource(String name) {
return null;
}
/**
* Returns an enumeration of {@link java.net.URL URL} objects
* representing all the resources with the given name. Class loader
* implementations should override this method to specify where to load
* resources from.
*
* @param name
* The resource name
*
* @return An enumeration of {@link java.net.URL URL} objects for
* the resources
*
* @throws IOException
* If I/O errors occur
*
* @since 1.2
*/
protected Enumeration findResources(String name) throws IOException {
return java.util.Collections.emptyEnumeration();
}
/**
* Registers the caller as parallel capable.
* The registration succeeds if and only if all of the following
* conditions are met:
*
* - no instance of the caller has been created
* - all of the super classes (except class Object) of the caller are
* registered as parallel capable
*
* Note that once a class loader is registered as parallel capable, there
* is no way to change it back.
*
* @return true if the caller is successfully registered as
* parallel capable and false if otherwise.
*
* @since 1.7
*/
@CallerSensitive
protected static boolean registerAsParallelCapable() {
Class extends ClassLoader> callerClass =
Reflection.getCallerClass().asSubclass(ClassLoader.class);
return ParallelLoaders.register(callerClass);
}
/**
* Find a resource of the specified name from the search path used to load
* classes. This method locates the resource through the system class
* loader (see {@link #getSystemClassLoader()}).
*
* @param name
* The resource name
*
* @return A {@link java.net.URL URL} object for reading the
* resource, or null if the resource could not be found
*
* @since 1.1
*/
public static URL getSystemResource(String name) {
ClassLoader system = getSystemClassLoader();
if (system == null) {
return getBootstrapResource(name);
}
return system.getResource(name);
}
/**
* Finds all resources of the specified name from the search path used to
* load classes. The resources thus found are returned as an
* {@link java.util.Enumeration Enumeration} of {@link
* java.net.URL URL} objects.
*
* The search order is described in the documentation for {@link
* #getSystemResource(String)}.
*
* @param name
* The resource name
*
* @return An enumeration of resource {@link java.net.URL URL}
* objects
*
* @throws IOException
* If I/O errors occur
* @since 1.2
*/
public static Enumeration getSystemResources(String name)
throws IOException
{
ClassLoader system = getSystemClassLoader();
if (system == null) {
return getBootstrapResources(name);
}
return system.getResources(name);
}
/**
* Find resources from the VM's built-in classloader.
*/
private static URL getBootstrapResource(String name) {
URLClassPath ucp = getBootstrapClassPath();
Resource res = ucp.getResource(name);
return res != null ? res.getURL() : null;
}
/**
* Find resources from the VM's built-in classloader.
*/
private static Enumeration getBootstrapResources(String name)
throws IOException
{
final Enumeration e =
getBootstrapClassPath().getResources(name);
return new Enumeration () {
public URL nextElement() {
return e.nextElement().getURL();
}
public boolean hasMoreElements() {
return e.hasMoreElements();
}
};
}
// Returns the URLClassPath that is used for finding system resources.
static URLClassPath getBootstrapClassPath() {
return sun.misc.Launcher.getBootstrapClassPath();
}
/**
* Returns an input stream for reading the specified resource.
*
* The search order is described in the documentation for {@link
* #getResource(String)}.
*
* @param name
* The resource name
*
* @return An input stream for reading the resource, or null
* if the resource could not be found
*
* @since 1.1
*/
public InputStream getResourceAsStream(String name) {
URL url = getResource(name);
try {
return url != null ? url.openStream() : null;
} catch (IOException e) {
return null;
}
}
/**
* Open for reading, a resource of the specified name from the search path
* used to load classes. This method locates the resource through the
* system class loader (see {@link #getSystemClassLoader()}).
*
* @param name
* The resource name
*
* @return An input stream for reading the resource, or null
* if the resource could not be found
*
* @since 1.1
*/
public static InputStream getSystemResourceAsStream(String name) {
URL url = getSystemResource(name);
try {
return url != null ? url.openStream() : null;
} catch (IOException e) {
return null;
}
}
// -- Hierarchy --
/**
* Returns the parent class loader for delegation. Some implementations may
* use null to represent the bootstrap class loader. This method
* will return null in such implementations if this class loader's
* parent is the bootstrap class loader.
*
* If a security manager is present, and the invoker's class loader is
* not null and is not an ancestor of this class loader, then this
* method invokes the security manager's {@link
* SecurityManager#checkPermission(java.security.Permission)
* checkPermission} method with a {@link
* RuntimePermission#RuntimePermission(String)
* RuntimePermission("getClassLoader")} permission to verify
* access to the parent class loader is permitted. If not, a
* SecurityException will be thrown.
*
* @return The parent ClassLoader
*
* @throws SecurityException
* If a security manager exists and its checkPermission
* method doesn't allow access to this class loader's parent class
* loader.
*
* @since 1.2
*/
@CallerSensitive
public final ClassLoader getParent() {
if (parent == null)
return null;
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkClassLoaderPermission(this, Reflection.getCallerClass());
}
return parent;
}
/**
* Returns the system class loader for delegation. This is the default
* delegation parent for new ClassLoader instances, and is
* typically the class loader used to start the application.
*
* This method is first invoked early in the runtime's startup
* sequence, at which point it creates the system class loader and sets it
* as the context class loader of the invoking Thread.
*
*
The default system class loader is an implementation-dependent
* instance of this class.
*
*
If the system property "java.system.class.loader" is defined
* when this method is first invoked then the value of that property is
* taken to be the name of a class that will be returned as the system
* class loader. The class is loaded using the default system class loader
* and must define a public constructor that takes a single parameter of
* type ClassLoader which is used as the delegation parent. An
* instance is then created using this constructor with the default system
* class loader as the parameter. The resulting class loader is defined
* to be the system class loader.
*
*
If a security manager is present, and the invoker's class loader is
* not null and the invoker's class loader is not the same as or
* an ancestor of the system class loader, then this method invokes the
* security manager's {@link
* SecurityManager#checkPermission(java.security.Permission)
* checkPermission} method with a {@link
* RuntimePermission#RuntimePermission(String)
* RuntimePermission("getClassLoader")} permission to verify
* access to the system class loader. If not, a
* SecurityException will be thrown.
*
* @return The system ClassLoader for delegation, or
* null if none
*
* @throws SecurityException
* If a security manager exists and its checkPermission
* method doesn't allow access to the system class loader.
*
* @throws IllegalStateException
* If invoked recursively during the construction of the class
* loader specified by the "java.system.class.loader"
* property.
*
* @throws Error
* If the system property "java.system.class.loader"
* is defined but the named class could not be loaded, the
* provider class does not define the required constructor, or an
* exception is thrown by that constructor when it is invoked. The
* underlying cause of the error can be retrieved via the
* {@link Throwable#getCause()} method.
*
* @revised 1.4
*/
@CallerSensitive
public static ClassLoader getSystemClassLoader() {
initSystemClassLoader();
if (scl == null) {
return null;
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
checkClassLoaderPermission(scl, Reflection.getCallerClass());
}
return scl;
}
private static synchronized void initSystemClassLoader() {
if (!sclSet) {
if (scl != null)
throw new IllegalStateException("recursive invocation");
sun.misc.Launcher l = sun.misc.Launcher.getLauncher();
if (l != null) {
Throwable oops = null;
scl = l.getClassLoader();
try {
scl = AccessController.doPrivileged(
new SystemClassLoaderAction(scl));
} catch (PrivilegedActionException pae) {
oops = pae.getCause();
if (oops instanceof InvocationTargetException) {
oops = oops.getCause();
}
}
if (oops != null) {
if (oops instanceof Error) {
throw (Error) oops;
} else {
// wrap the exception
throw new Error(oops);
}
}
}
sclSet = true;
}
}
// Returns true if the specified class loader can be found in this class
// loader's delegation chain.
boolean isAncestor(ClassLoader cl) {
ClassLoader acl = this;
do {
acl = acl.parent;
if (cl == acl) {
return true;
}
} while (acl != null);
return false;
}
// Tests if class loader access requires "getClassLoader" permission
// check. A class loader 'from' can access class loader 'to' if
// class loader 'from' is same as class loader 'to' or an ancestor
// of 'to'. The class loader in a system domain can access
// any class loader.
private static boolean needsClassLoaderPermissionCheck(ClassLoader from,
ClassLoader to)
{
if (from == to)
return false;
if (from == null)
return false;
return !to.isAncestor(from);
}
// Returns the class's class loader, or null if none.
static ClassLoader getClassLoader(Class> caller) {
// This can be null if the VM is requesting it
if (caller == null) {
return null;
}
// Circumvent security check since this is package-private
return caller.getClassLoader0();
}
static void checkClassLoaderPermission(ClassLoader cl, Class> caller) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
// caller can be null if the VM is requesting it
ClassLoader ccl = getClassLoader(caller);
if (needsClassLoaderPermissionCheck(ccl, cl)) {
sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
}
}
}
// The class loader for the system
// @GuardedBy("ClassLoader.class")
private static ClassLoader scl;
// Set to true once the system class loader has been set
// @GuardedBy("ClassLoader.class")
private static boolean sclSet;
// -- Package --
/**
* Defines a package by name in this ClassLoader. This allows
* class loaders to define the packages for their classes. Packages must
* be created before the class is defined, and package names must be
* unique within a class loader and cannot be redefined or changed once
* created.
*
* @param name
* The package name
*
* @param specTitle
* The specification title
*
* @param specVersion
* The specification version
*
* @param specVendor
* The specification vendor
*
* @param implTitle
* The implementation title
*
* @param implVersion
* The implementation version
*
* @param implVendor
* The implementation vendor
*
* @param sealBase
* If not null, then this package is sealed with
* respect to the given code source {@link java.net.URL
* URL} object. Otherwise, the package is not sealed.
*
* @return The newly defined Package object
*
* @throws IllegalArgumentException
* If package name duplicates an existing package either in this
* class loader or one of its ancestors
*
* @since 1.2
*/
protected Package definePackage(String name, String specTitle,
String specVersion, String specVendor,
String implTitle, String implVersion,
String implVendor, URL sealBase)
throws IllegalArgumentException
{
synchronized (packages) {
Package pkg = getPackage(name);
if (pkg != null) {
throw new IllegalArgumentException(name);
}
pkg = new Package(name, specTitle, specVersion, specVendor,
implTitle, implVersion, implVendor,
sealBase, this);
packages.put(name, pkg);
return pkg;
}
}
/**
* Returns a Package that has been defined by this class loader
* or any of its ancestors.
*
* @param name
* The package name
*
* @return The Package corresponding to the given name, or
* null if not found
*
* @since 1.2
*/
protected Package getPackage(String name) {
Package pkg;
synchronized (packages) {
pkg = packages.get(name);
}
if (pkg == null) {
if (parent != null) {
pkg = parent.getPackage(name);
} else {
pkg = Package.getSystemPackage(name);
}
if (pkg != null) {
synchronized (packages) {
Package pkg2 = packages.get(name);
if (pkg2 == null) {
packages.put(name, pkg);
} else {
pkg = pkg2;
}
}
}
}
return pkg;
}
/**
* Returns all of the Packages defined by this class loader and
* its ancestors.
*
* @return The array of Package objects defined by this
* ClassLoader
*
* @since 1.2
*/
protected Package[] getPackages() {
Map map;
synchronized (packages) {
map = new HashMap<>(packages);
}
Package[] pkgs;
if (parent != null) {
pkgs = parent.getPackages();
} else {
pkgs = Package.getSystemPackages();
}
if (pkgs != null) {
for (Package pkg : pkgs) {
String pkgName = pkg.getName();
if (map.get(pkgName) == null) {
map.put(pkgName, pkg);
}
}
}
return map.values().toArray(new Package[map.size()]);
}
// -- Native library access --
/**
* Returns the absolute path name of a native library. The VM invokes this
* method to locate the native libraries that belong to classes loaded with
* this class loader. If this method returns null, the VM
* searches the library along the path specified as the
* "java.library.path" property.
*
* @param libname
* The library name
*
* @return The absolute path of the native library
*
* @see System#loadLibrary(String)
* @see System#mapLibraryName(String)
*
* @since 1.2
*/
protected String findLibrary(String libname) {
return null;
}
/**
* The inner class NativeLibrary denotes a loaded native library instance.
* Every classloader contains a vector of loaded native libraries in the
* private field nativeLibraries. The native libraries loaded
* into the system are entered into the systemNativeLibraries
* vector.
*
* Every native library requires a particular version of JNI. This is
* denoted by the private jniVersion field. This field is set by
* the VM when it loads the library, and used by the VM to pass the correct
* version of JNI to the native methods.
*
* @see ClassLoader
* @since 1.2
*/
static class NativeLibrary {
// opaque handle to native library, used in native code.
long handle;
// the version of JNI environment the native library requires.
private int jniVersion;
// the class from which the library is loaded, also indicates
// the loader this native library belongs.
private final Class> fromClass;
// the canonicalized name of the native library.
// or static library name
String name;
// Indicates if the native library is linked into the VM
boolean isBuiltin;
// Indicates if the native library is loaded
boolean loaded;
native void load(String name, boolean isBuiltin);
native long find(String name);
native void unload(String name, boolean isBuiltin);
static native String findBuiltinLib(String name);
public NativeLibrary(Class> fromClass, String name, boolean isBuiltin) {
this.name = name;
this.fromClass = fromClass;
this.isBuiltin = isBuiltin;
}
protected void finalize() {
synchronized (loadedLibraryNames) {
if (fromClass.getClassLoader() != null && loaded) {
/* remove the native library name */
int size = loadedLibraryNames.size();
for (int i = 0; i < size; i++) {
if (name.equals(loadedLibraryNames.elementAt(i))) {
loadedLibraryNames.removeElementAt(i);
break;
}
}
/* unload the library. */
ClassLoader.nativeLibraryContext.push(this);
try {
unload(name, isBuiltin);
} finally {
ClassLoader.nativeLibraryContext.pop();
}
}
}
}
// Invoked in the VM to determine the context class in
// JNI_Load/JNI_Unload
static Class> getFromClass() {
return ClassLoader.nativeLibraryContext.peek().fromClass;
}
}
// All native library names we've loaded.
private static Vector loadedLibraryNames = new Vector<>();
// Native libraries belonging to system classes.
private static Vector systemNativeLibraries
= new Vector<>();
// Native libraries associated with the class loader.
private Vector nativeLibraries = new Vector<>();
// native libraries being loaded/unloaded.
private static Stack nativeLibraryContext = new Stack<>();
// The paths searched for libraries
private static String usr_paths[];
private static String sys_paths[];
private static String[] initializePath(String propname) {
String ldpath = System.getProperty(propname, "");
String ps = File.pathSeparator;
int ldlen = ldpath.length();
int i, j, n;
// Count the separators in the path
i = ldpath.indexOf(ps);
n = 0;
while (i >= 0) {
n++;
i = ldpath.indexOf(ps, i + 1);
}
// allocate the array of paths - n :'s = n + 1 path elements
String[] paths = new String[n + 1];
// Fill the array with paths from the ldpath
n = i = 0;
j = ldpath.indexOf(ps);
while (j >= 0) {
if (j - i > 0) {
paths[n++] = ldpath.substring(i, j);
} else if (j - i == 0) {
paths[n++] = ".";
}
i = j + 1;
j = ldpath.indexOf(ps, i);
}
paths[n] = ldpath.substring(i, ldlen);
return paths;
}
// Invoked in the java.lang.Runtime class to implement load and loadLibrary.
static void loadLibrary(Class> fromClass, String name,
boolean isAbsolute) {
ClassLoader loader =
(fromClass == null) ? null : fromClass.getClassLoader();
if (sys_paths == null) {
usr_paths = initializePath("java.library.path");
sys_paths = initializePath("sun.boot.library.path");
}
if (isAbsolute) {
if (loadLibrary0(fromClass, new File(name))) {
return;
}
throw new UnsatisfiedLinkError("Can't load library: " + name);
}
if (loader != null) {
String libfilename = loader.findLibrary(name);
if (libfilename != null) {
File libfile = new File(libfilename);
if (!libfile.isAbsolute()) {
throw new UnsatisfiedLinkError(
"ClassLoader.findLibrary failed to return an absolute path: " + libfilename);
}
if (loadLibrary0(fromClass, libfile)) {
return;
}
throw new UnsatisfiedLinkError("Can't load " + libfilename);
}
}
for (String sys_path : sys_paths) {
File libfile = new File(sys_path, System.mapLibraryName(name));
if (loadLibrary0(fromClass, libfile)) {
return;
}
libfile = ClassLoaderHelper.mapAlternativeName(libfile);
if (libfile != null && loadLibrary0(fromClass, libfile)) {
return;
}
}
if (loader != null) {
for (String usr_path : usr_paths) {
File libfile = new File(usr_path, System.mapLibraryName(name));
if (loadLibrary0(fromClass, libfile)) {
return;
}
libfile = ClassLoaderHelper.mapAlternativeName(libfile);
if (libfile != null && loadLibrary0(fromClass, libfile)) {
return;
}
}
}
// Oops, it failed
throw new UnsatisfiedLinkError("no " + name + " in java.library.path");
}
private static boolean loadLibrary0(Class> fromClass, final File file) {
// Check to see if we're attempting to access a static library
String name = NativeLibrary.findBuiltinLib(file.getName());
boolean isBuiltin = (name != null);
if (!isBuiltin) {
name = AccessController.doPrivileged(
new PrivilegedAction() {
public String run() {
try {
return file.exists() ? file.getCanonicalPath() : null;
} catch (IOException e) {
return null;
}
}
});
if (name == null) {
return false;
}
}
ClassLoader loader =
(fromClass == null) ? null : fromClass.getClassLoader();
Vector libs =
loader != null ? loader.nativeLibraries : systemNativeLibraries;
synchronized (libs) {
int size = libs.size();
for (int i = 0; i < size; i++) {
NativeLibrary lib = libs.elementAt(i);
if (name.equals(lib.name)) {
return true;
}
}
synchronized (loadedLibraryNames) {
if (loadedLibraryNames.contains(name)) {
throw new UnsatisfiedLinkError
("Native Library " +
name +
" already loaded in another classloader");
}
/* If the library is being loaded (must be by the same thread,
* because Runtime.load and Runtime.loadLibrary are
* synchronous). The reason is can occur is that the JNI_OnLoad
* function can cause another loadLibrary invocation.
*
* Thus we can use a static stack to hold the list of libraries
* we are loading.
*
* If there is a pending load operation for the library, we
* immediately return success; otherwise, we raise
* UnsatisfiedLinkError.
*/
int n = nativeLibraryContext.size();
for (int i = 0; i < n; i++) {
NativeLibrary lib = nativeLibraryContext.elementAt(i);
if (name.equals(lib.name)) {
if (loader == lib.fromClass.getClassLoader()) {
return true;
} else {
throw new UnsatisfiedLinkError
("Native Library " +
name +
" is being loaded in another classloader");
}
}
}
NativeLibrary lib = new NativeLibrary(fromClass, name, isBuiltin);
nativeLibraryContext.push(lib);
try {
lib.load(name, isBuiltin);
} finally {
nativeLibraryContext.pop();
}
if (lib.loaded) {
loadedLibraryNames.addElement(name);
libs.addElement(lib);
return true;
}
return false;
}
}
}
// Invoked in the VM class linking code.
static long findNative(ClassLoader loader, String name) {
Vector libs =
loader != null ? loader.nativeLibraries : systemNativeLibraries;
synchronized (libs) {
int size = libs.size();
for (int i = 0; i < size; i++) {
NativeLibrary lib = libs.elementAt(i);
long entry = lib.find(name);
if (entry != 0)
return entry;
}
}
return 0;
}
// -- Assertion management --
final Object assertionLock;
// The default toggle for assertion checking.
// @GuardedBy("assertionLock")
private boolean defaultAssertionStatus = false;
// Maps String packageName to Boolean package default assertion status Note
// that the default package is placed under a null map key. If this field
// is null then we are delegating assertion status queries to the VM, i.e.,
// none of this ClassLoader's assertion status modification methods have
// been invoked.
// @GuardedBy("assertionLock")
private Map packageAssertionStatus = null;
// Maps String fullyQualifiedClassName to Boolean assertionStatus If this
// field is null then we are delegating assertion status queries to the VM,
// i.e., none of this ClassLoader's assertion status modification methods
// have been invoked.
// @GuardedBy("assertionLock")
Map classAssertionStatus = null;
/**
* Sets the default assertion status for this class loader. This setting
* determines whether classes loaded by this class loader and initialized
* in the future will have assertions enabled or disabled by default.
* This setting may be overridden on a per-package or per-class basis by
* invoking {@link #setPackageAssertionStatus(String, boolean)} or {@link
* #setClassAssertionStatus(String, boolean)}.
*
* @param enabled
* true if classes loaded by this class loader will
* henceforth have assertions enabled by default, false
* if they will have assertions disabled by default.
*
* @since 1.4
*/
public void setDefaultAssertionStatus(boolean enabled) {
synchronized (assertionLock) {
if (classAssertionStatus == null)
initializeJavaAssertionMaps();
defaultAssertionStatus = enabled;
}
}
/**
* Sets the package default assertion status for the named package. The
* package default assertion status determines the assertion status for
* classes initialized in the future that belong to the named package or
* any of its "subpackages".
*
* A subpackage of a package named p is any package whose name begins
* with "p.". For example, javax.swing.text is a
* subpackage of javax.swing, and both java.util and
* java.lang.reflect are subpackages of java.
*
*
In the event that multiple package defaults apply to a given class,
* the package default pertaining to the most specific package takes
* precedence over the others. For example, if javax.lang and
* javax.lang.reflect both have package defaults associated with
* them, the latter package default applies to classes in
* javax.lang.reflect.
*
*
Package defaults take precedence over the class loader's default
* assertion status, and may be overridden on a per-class basis by invoking
* {@link #setClassAssertionStatus(String, boolean)}.
*
* @param packageName
* The name of the package whose package default assertion status
* is to be set. A null value indicates the unnamed
* package that is "current"
* (see section 7.4.2 of
* The Java™ Language Specification.)
*
* @param enabled
* true if classes loaded by this classloader and
* belonging to the named package or any of its subpackages will
* have assertions enabled by default, false if they will
* have assertions disabled by default.
*
* @since 1.4
*/
public void setPackageAssertionStatus(String packageName,
boolean enabled) {
synchronized (assertionLock) {
if (packageAssertionStatus == null)
initializeJavaAssertionMaps();
packageAssertionStatus.put(packageName, enabled);
}
}
/**
* Sets the desired assertion status for the named top-level class in this
* class loader and any nested classes contained therein. This setting
* takes precedence over the class loader's default assertion status, and
* over any applicable per-package default. This method has no effect if
* the named class has already been initialized. (Once a class is
* initialized, its assertion status cannot change.)
*
* If the named class is not a top-level class, this invocation will
* have no effect on the actual assertion status of any class.
*
* @param className
* The fully qualified class name of the top-level class whose
* assertion status is to be set.
*
* @param enabled
* true if the named class is to have assertions
* enabled when (and if) it is initialized, false if the
* class is to have assertions disabled.
*
* @since 1.4
*/
public void setClassAssertionStatus(String className, boolean enabled) {
synchronized (assertionLock) {
if (classAssertionStatus == null)
initializeJavaAssertionMaps();
classAssertionStatus.put(className, enabled);
}
}
/**
* Sets the default assertion status for this class loader to
* false and discards any package defaults or class assertion
* status settings associated with the class loader. This method is
* provided so that class loaders can be made to ignore any command line or
* persistent assertion status settings and "start with a clean slate."
*
* @since 1.4
*/
public void clearAssertionStatus() {
/*
* Whether or not "Java assertion maps" are initialized, set
* them to empty maps, effectively ignoring any present settings.
*/
synchronized (assertionLock) {
classAssertionStatus = new HashMap<>();
packageAssertionStatus = new HashMap<>();
defaultAssertionStatus = false;
}
}
/**
* Returns the assertion status that would be assigned to the specified
* class if it were to be initialized at the time this method is invoked.
* If the named class has had its assertion status set, the most recent
* setting will be returned; otherwise, if any package default assertion
* status pertains to this class, the most recent setting for the most
* specific pertinent package default assertion status is returned;
* otherwise, this class loader's default assertion status is returned.
*
*
* @param className
* The fully qualified class name of the class whose desired
* assertion status is being queried.
*
* @return The desired assertion status of the specified class.
*
* @see #setClassAssertionStatus(String, boolean)
* @see #setPackageAssertionStatus(String, boolean)
* @see #setDefaultAssertionStatus(boolean)
*
* @since 1.4
*/
boolean desiredAssertionStatus(String className) {
synchronized (assertionLock) {
// assert classAssertionStatus != null;
// assert packageAssertionStatus != null;
// Check for a class entry
Boolean result = classAssertionStatus.get(className);
if (result != null)
return result.booleanValue();
// Check for most specific package entry
int dotIndex = className.lastIndexOf('.');
if (dotIndex < 0) { // default package
result = packageAssertionStatus.get(null);
if (result != null)
return result.booleanValue();
}
while(dotIndex > 0) {
className = className.substring(0, dotIndex);
result = packageAssertionStatus.get(className);
if (result != null)
return result.booleanValue();
dotIndex = className.lastIndexOf('.', dotIndex-1);
}
// Return the classloader default
return defaultAssertionStatus;
}
}
// Set up the assertions with information provided by the VM.
// Note: Should only be called inside a synchronized block
private void initializeJavaAssertionMaps() {
// assert Thread.holdsLock(assertionLock);
classAssertionStatus = new HashMap<>();
packageAssertionStatus = new HashMap<>();
AssertionStatusDirectives directives = retrieveDirectives();
for(int i = 0; i < directives.classes.length; i++)
classAssertionStatus.put(directives.classes[i],
directives.classEnabled[i]);
for(int i = 0; i < directives.packages.length; i++)
packageAssertionStatus.put(directives.packages[i],
directives.packageEnabled[i]);
defaultAssertionStatus = directives.deflt;
}
// Retrieves the assertion directives from the VM.
private static native AssertionStatusDirectives retrieveDirectives();
}
class SystemClassLoaderAction
implements PrivilegedExceptionAction {
private ClassLoader parent;
SystemClassLoaderAction(ClassLoader parent) {
this.parent = parent;
}
public ClassLoader run() throws Exception {
String cls = System.getProperty("java.system.class.loader");
if (cls == null) {
return parent;
}
Constructor> ctor = Class.forName(cls, true, parent)
.getDeclaredConstructor(new Class>[] { ClassLoader.class });
ClassLoader sys = (ClassLoader) ctor.newInstance(
new Object[] { parent });
Thread.currentThread().setContextClassLoader(sys);
return sys;
}
}