| Methods Summary |
|---|
| void | addClass(java.lang.Class c)
// Invoked by the VM to record every loaded class with this loader.
classes.addElement(c);
|
| private void | check()
if (!initialized) {
throw new SecurityException("ClassLoader object not initialized");
}
|
| private synchronized void | checkCerts(java.lang.String name, java.security.CodeSource cs)
int i = name.lastIndexOf('.");
String pname = (i == -1) ? "" : name.substring(0, i);
java.security.cert.Certificate[] pcerts =
(java.security.cert.Certificate[]) package2certs.get(pname);
if (pcerts == null) {
// first class in this package gets to define which
// certificates must be the same for all other classes
// in this package
if (cs != null) {
pcerts = cs.getCertificates();
}
if (pcerts == null) {
if (nocerts == null)
nocerts = new java.security.cert.Certificate[0];
pcerts = nocerts;
}
package2certs.put(pname, pcerts);
} else {
java.security.cert.Certificate[] certs = null;
if (cs != null) {
certs = cs.getCertificates();
}
if (!compareCerts(pcerts, certs)) {
throw new SecurityException("class \""+ name +
"\"'s signer information does not match signer information of other classes in the same package");
}
}
|
| private boolean | checkName(java.lang.String name)
if ((name == null) || (name.length() == 0))
return true;
if ((name.indexOf('/") != -1)
|| (!VM.allowArraySyntax() && (name.charAt(0) == '[")))
return false;
return true;
|
| private void | checkPackageAccess(java.lang.Class cls, java.security.ProtectionDomain pd)
final SecurityManager sm = System.getSecurityManager();
if (sm != null) {
final String name = cls.getName();
final int i = name.lastIndexOf('.");
if (i != -1) {
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
sm.checkPackageAccess(name.substring(0, i));
return null;
}
}, new AccessControlContext(new ProtectionDomain[] {pd}));
}
}
domains.add(pd);
|
| public synchronized void | clearAssertionStatus()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."
/*
* Whether or not "Java assertion maps" are initialized, set
* them to empty maps, effectively ignoring any present settings.
*/
classAssertionStatus = new HashMap();
packageAssertionStatus = new HashMap();
defaultAssertionStatus = false;
|
| private boolean | compareCerts(java.security.cert.Certificate[] pcerts, java.security.cert.Certificate[] certs)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)
// 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 (int i = 0; i < certs.length; i++) {
match = false;
for (int j = 0; j < pcerts.length; j++) {
if (certs[i].equals(pcerts[j])) {
match = true;
break;
}
}
if (!match) return false;
}
// now do the same for pcerts
for (int i = 0; i < pcerts.length; i++) {
match = false;
for (int j = 0; j < certs.length; j++) {
if (pcerts[i].equals(certs[j])) {
match = true;
break;
}
}
if (!match) return false;
}
return true;
|
| protected final java.lang.Class | defineClass(byte[] b, int off, int len)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.
return defineClass(null, b, off, len, null);
|
| protected final java.lang.Class | defineClass(java.lang.String name, byte[] b, int off, int len)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.
return defineClass(name, b, off, len, null);
|
| protected final java.lang.Class | defineClass(java.lang.String name, byte[] b, int off, int len, java.security.ProtectionDomain protectionDomain)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} will be thrown.
check();
protectionDomain = preDefineClass(name, protectionDomain);
Class c = null;
String source = defineClassSourceLocation(protectionDomain);
try {
c = defineClass1(name, b, off, len, protectionDomain, source);
} catch (ClassFormatError cfe) {
c = defineTransformedClass(name, b, off, len, protectionDomain, cfe, source);
}
postDefineClass(c, protectionDomain);
return c;
|
| protected final java.lang.Class | defineClass(java.lang.String name, java.nio.ByteBuffer b, java.security.ProtectionDomain protectionDomain)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);
check();
int len = b.remaining();
// Use byte[] if not a direct ByteBufer:
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);
Class c = null;
String source = defineClassSourceLocation(protectionDomain);
try {
c = defineClass2(name, b, b.position(), len, protectionDomain, source);
} catch (ClassFormatError cfe) {
byte[] tb = new byte[len];
b.get(tb); // get bytes out of byte buffer.
c = defineTransformedClass(name, tb, 0, len, protectionDomain, cfe, source);
}
postDefineClass(c, protectionDomain);
return c;
|
| private native java.lang.Class | defineClass0(java.lang.String name, byte[] b, int off, int len, java.security.ProtectionDomain pd)
|
| private native java.lang.Class | defineClass1(java.lang.String name, byte[] b, int off, int len, java.security.ProtectionDomain pd, java.lang.String source)
|
| private native java.lang.Class | defineClass2(java.lang.String name, java.nio.ByteBuffer b, int off, int len, java.security.ProtectionDomain pd, java.lang.String source)
|
| private java.lang.String | defineClassSourceLocation(java.security.ProtectionDomain protectionDomain)
CodeSource cs = protectionDomain.getCodeSource();
String source = null;
if (cs != null && cs.getLocation() != null) {
source = cs.getLocation().toString();
}
return source;
|
| protected java.lang.Package | definePackage(java.lang.String name, java.lang.String specTitle, java.lang.String specVersion, java.lang.String specVendor, java.lang.String implTitle, java.lang.String implVersion, java.lang.String implVendor, java.net.URL sealBase)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.
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;
}
|
| private java.lang.Class | defineTransformedClass(java.lang.String name, byte[] b, int off, int len, java.security.ProtectionDomain protectionDomain, java.lang.ClassFormatError cfe, java.lang.String source)
// Class format error - try to transform the bytecode and
// define the class again
//
Object[] transformers = ClassFileTransformer.getTransformers();
Class c = null;
for (int i = 0; transformers != null && i < transformers.length; i++) {
try {
// Transform byte code using transformer
byte[] tb = ((ClassFileTransformer) transformers[i]).transform(b, off, len);
c = defineClass1(name, tb, 0, tb.length, protectionDomain, source);
break;
} catch (ClassFormatError cfe2) {
// If ClassFormatError occurs, try next transformer
}
}
// Rethrow original ClassFormatError if unable to transform
// bytecode to well-formed
//
if (c == null)
throw cfe;
return c;
|
| synchronized boolean | desiredAssertionStatus(java.lang.String className)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.
Boolean result;
// assert classAssertionStatus != null;
// assert packageAssertionStatus != null;
// Check for a class entry
result = (Boolean)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 = (Boolean)packageAssertionStatus.get(null);
if (result != null)
return result.booleanValue();
}
while(dotIndex > 0) {
className = className.substring(0, dotIndex);
result = (Boolean)packageAssertionStatus.get(className);
if (result != null)
return result.booleanValue();
dotIndex = className.lastIndexOf(".", dotIndex-1);
}
// Return the classloader default
return defaultAssertionStatus;
|
| private native java.lang.Class | findBootstrapClass(java.lang.String name)
|
| private java.lang.Class | findBootstrapClass0(java.lang.String name)
check();
if (!checkName(name))
throw new ClassNotFoundException(name);
return findBootstrapClass(name);
|
| protected java.lang.Class | findClass(java.lang.String name)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.
throw new ClassNotFoundException(name);
|
| protected java.lang.String | findLibrary(java.lang.String libname)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.
return null;
|
| protected final java.lang.Class | findLoadedClass(java.lang.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.
check();
if (!checkName(name))
return null;
return findLoadedClass0(name);
|
| private final native java.lang.Class | findLoadedClass0(java.lang.String name)
|
| static long | findNative(java.lang.ClassLoader loader, java.lang.String name)
Vector libs =
loader != null ? loader.nativeLibraries : systemNativeLibraries;
synchronized (libs) {
int size = libs.size();
for (int i = 0; i < size; i++) {
NativeLibrary lib = (NativeLibrary)libs.elementAt(i);
long entry = lib.find(name);
if (entry != 0)
return entry;
}
}
return 0;
|
| protected java.net.URL | findResource(java.lang.String name)Finds the resource with the given name. Class loader implementations
should override this method to specify where to find resources.
return null;
|
| protected java.util.Enumeration | findResources(java.lang.String name)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.
return new CompoundEnumeration(new Enumeration[0]);
|
| protected final java.lang.Class | findSystemClass(java.lang.String name)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)}.
check();
ClassLoader system = getSystemClassLoader();
if (system == null) {
if (!checkName(name))
throw new ClassNotFoundException(name);
return findBootstrapClass(name);
}
return system.loadClass(name);
|
| static sun.misc.URLClassPath | getBootstrapClassPath()
if (bootstrapClassPath == null) {
bootstrapClassPath = sun.misc.Launcher.getBootstrapClassPath();
}
return bootstrapClassPath;
|
| private static java.net.URL | getBootstrapResource(java.lang.String name)Find resources from the VM's built-in classloader.
URLClassPath ucp = getBootstrapClassPath();
Resource res = ucp.getResource(name);
return res != null ? res.getURL() : null;
|
| private static java.util.Enumeration | getBootstrapResources(java.lang.String name)Find resources from the VM's built-in classloader.
final Enumeration e = getBootstrapClassPath().getResources(name);
return new Enumeration () {
public Object nextElement() {
return ((Resource)e.nextElement()).getURL();
}
public boolean hasMoreElements() {
return e.hasMoreElements();
}
};
|
| static java.lang.ClassLoader | getCallerClassLoader()
// NOTE use of more generic Reflection.getCallerClass()
Class caller = Reflection.getCallerClass(3);
// 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();
|
| private synchronized java.security.ProtectionDomain | getDefaultDomain()
// Returns (and initializes) the default domain.
if (defaultDomain == null) {
CodeSource cs =
new CodeSource(null, (java.security.cert.Certificate[]) null);
defaultDomain = new ProtectionDomain(cs, null, this, null);
}
return defaultDomain;
|
| protected java.lang.Package | getPackage(java.lang.String name)Returns a Package that has been defined by this class loader
or any of its ancestors.
synchronized (packages) {
Package pkg = (Package)packages.get(name);
if (pkg == null) {
if (parent != null) {
pkg = parent.getPackage(name);
} else {
pkg = Package.getSystemPackage(name);
}
if (pkg != null) {
packages.put(name, pkg);
}
}
return pkg;
}
|
| protected java.lang.Package[] | getPackages()Returns all of the Packages defined by this class loader and
its ancestors.
Map map;
synchronized (packages) {
map = (Map)packages.clone();
}
Package[] pkgs;
if (parent != null) {
pkgs = parent.getPackages();
} else {
pkgs = Package.getSystemPackages();
}
if (pkgs != null) {
for (int i = 0; i < pkgs.length; i++) {
String pkgName = pkgs[i].getName();
if (map.get(pkgName) == null) {
map.put(pkgName, pkgs[i]);
}
}
}
return (Package[])map.values().toArray(new Package[map.size()]);
|
| public final java.lang.ClassLoader | getParent()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.
if (parent == null)
return null;
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
ClassLoader ccl = getCallerClassLoader();
if (ccl != null && !isAncestor(ccl)) {
sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
}
}
return parent;
|
| public java.net.URL | getResource(java.lang.String name)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.
URL url;
if (parent != null) {
url = parent.getResource(name);
} else {
url = getBootstrapResource(name);
}
if (url == null) {
url = findResource(name);
}
return url;
|
| public java.io.InputStream | getResourceAsStream(java.lang.String name)Returns an input stream for reading the specified resource.
The search order is described in the documentation for {@link
#getResource(String)}.
URL url = getResource(name);
try {
return url != null ? url.openStream() : null;
} catch (IOException e) {
return null;
}
|
| public java.util.Enumeration | getResources(java.lang.String name)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)}.
Enumeration[] tmp = new Enumeration[2];
if (parent != null) {
tmp[0] = parent.getResources(name);
} else {
tmp[0] = getBootstrapResources(name);
}
tmp[1] = findResources(name);
return new CompoundEnumeration(tmp);
|
| public static java.lang.ClassLoader | getSystemClassLoader()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.
initSystemClassLoader();
if (scl == null) {
return null;
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
ClassLoader ccl = getCallerClassLoader();
if (ccl != null && ccl != scl && !scl.isAncestor(ccl)) {
sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
}
}
return scl;
|
| public static java.net.URL | getSystemResource(java.lang.String name)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()}).
ClassLoader system = getSystemClassLoader();
if (system == null) {
return getBootstrapResource(name);
}
return system.getResource(name);
|
| public static java.io.InputStream | getSystemResourceAsStream(java.lang.String name)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()}).
URL url = getSystemResource(name);
try {
return url != null ? url.openStream() : null;
} catch (IOException e) {
return null;
}
|
| public static java.util.Enumeration | getSystemResources(java.lang.String 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)}.
ClassLoader system = getSystemClassLoader();
if (system == null) {
return getBootstrapResources(name);
}
return system.getResources(name);
|
| 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 {
PrivilegedExceptionAction a;
a = new SystemClassLoaderAction(scl);
scl = (ClassLoader) AccessController.doPrivileged(a);
} 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;
}
|
| private void | initializeJavaAssertionMaps()
// assert Thread.holdsLock(this);
classAssertionStatus = new HashMap();
packageAssertionStatus = new HashMap();
AssertionStatusDirectives directives = retrieveDirectives();
for(int i = 0; i < directives.classes.length; i++)
classAssertionStatus.put(directives.classes[i],
Boolean.valueOf(directives.classEnabled[i]));
for(int i = 0; i < directives.packages.length; i++)
packageAssertionStatus.put(directives.packages[i],
Boolean.valueOf(directives.packageEnabled[i]));
defaultAssertionStatus = directives.deflt;
|
| private static java.lang.String[] | initializePath(java.lang.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;
|
| boolean | isAncestor(java.lang.ClassLoader cl)
ClassLoader acl = this;
do {
acl = acl.parent;
if (cl == acl) {
return true;
}
} while (acl != null);
return false;
|
| public java.lang.Class | loadClass(java.lang.String name)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)}.
return loadClass(name, false);
|
| protected synchronized java.lang.Class | loadClass(java.lang.String name, boolean resolve)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.
// First, check if the class has already been loaded
Class c = findLoadedClass(name);
if (c == null) {
try {
if (parent != null) {
c = parent.loadClass(name, false);
} else {
c = findBootstrapClass0(name);
}
} catch (ClassNotFoundException e) {
// If still not found, then invoke findClass in order
// to find the class.
c = findClass(name);
}
}
if (resolve) {
resolveClass(c);
}
return c;
|
| private synchronized java.lang.Class | loadClassInternal(java.lang.String name)
return loadClass(name);
|
| static void | loadLibrary(java.lang.Class fromClass, java.lang.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 (int i = 0 ; i < sys_paths.length ; i++) {
File libfile = new File(sys_paths[i], System.mapLibraryName(name));
if (loadLibrary0(fromClass, libfile)) {
return;
}
}
if (loader != null) {
for (int i = 0 ; i < usr_paths.length ; i++) {
File libfile = new File(usr_paths[i],
System.mapLibraryName(name));
if (loadLibrary0(fromClass, libfile)) {
return;
}
}
}
// Oops, it failed
throw new UnsatisfiedLinkError("no " + name + " in java.library.path");
|
| private static boolean | loadLibrary0(java.lang.Class fromClass, java.io.File file)
Boolean exists = (Boolean)
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return new Boolean(file.exists());
}
});
if (!exists.booleanValue()) {
return false;
}
String name;
try {
name = file.getCanonicalPath();
} catch (IOException e) {
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 = (NativeLibrary)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 = (NativeLibrary)
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);
nativeLibraryContext.push(lib);
try {
lib.load(name);
} finally {
nativeLibraryContext.pop();
}
if (lib.handle != 0) {
loadedLibraryNames.addElement(name);
libs.addElement(lib);
return true;
}
return false;
}
}
|
| private void | postDefineClass(java.lang.Class c, java.security.ProtectionDomain protectionDomain)
if (protectionDomain.getCodeSource() != null) {
java.security.cert.Certificate certs[] =
protectionDomain.getCodeSource().getCertificates();
if (certs != null)
setSigners(c, certs);
}
|
| private java.security.ProtectionDomain | preDefineClass(java.lang.String name, java.security.ProtectionDomain protectionDomain)
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 (protectionDomain == null) {
protectionDomain = getDefaultDomain();
}
if (name != null)
checkCerts(name, protectionDomain.getCodeSource());
return protectionDomain;
|
| private static native void | registerNatives()
|
| protected final void | resolveClass(java.lang.Class c)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.
check();
resolveClass0(c);
|
| private native void | resolveClass0(java.lang.Class c)
|
| private static native java.lang.AssertionStatusDirectives | retrieveDirectives()
|
| public synchronized void | setClassAssertionStatus(java.lang.String className, boolean 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.
if (classAssertionStatus == null)
initializeJavaAssertionMaps();
classAssertionStatus.put(className, Boolean.valueOf(enabled));
|
| public synchronized void | setDefaultAssertionStatus(boolean enabled)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)}.
if (classAssertionStatus == null)
initializeJavaAssertionMaps();
defaultAssertionStatus = enabled;
|
| public synchronized void | setPackageAssertionStatus(java.lang.String packageName, boolean 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)}.
if (packageAssertionStatus == null)
initializeJavaAssertionMaps();
packageAssertionStatus.put(packageName, Boolean.valueOf(enabled));
|
| protected final void | setSigners(java.lang.Class c, java.lang.Object[] signers)Sets the signers of a class. This should be invoked after defining a
class.
check();
c.setSigners(signers);
|
