java.lang
Class SecurityManager

java.lang.Object
  extended by java.lang.SecurityManager
Direct Known Subclasses:
RMISecurityManager

public class SecurityManager
extends Object

SecurityManager is a class you can extend to create your own Java security policy. By default, there is no SecurityManager installed in 1.1, which means that all things are permitted to all people. The security manager, if set, is consulted before doing anything with potentially dangerous results, and throws a SecurityException if the action is forbidden.

A typical check is as follows, just before the dangerous operation:

 SecurityManager sm = System.getSecurityManager();
 if (sm != null)
   sm.checkABC(argument, ...);
 
Note that this is thread-safe, by caching the security manager in a local variable rather than risking a NullPointerException if the mangager is changed between the check for null and before the permission check.

The special method checkPermission is a catchall, and the default implementation calls AccessController.checkPermission. In fact, all the other methods default to calling checkPermission.

Sometimes, the security check needs to happen from a different context, such as when called from a worker thread. In such cases, use getSecurityContext to take a snapshot that can be passed to the worker thread:

 Object context = null;
 SecurityManager sm = System.getSecurityManager();
 if (sm != null)
   context = sm.getSecurityContext(); // defaults to an AccessControlContext
 // now, in worker thread
 if (sm != null)
   sm.checkPermission(permission, context);
 

Permissions fall into these categories: File, Socket, Net, Security, Runtime, Property, AWT, Reflect, and Serializable. Each of these permissions have a property naming convention, that follows a hierarchical naming convention, to make it easy to grant or deny several permissions at once. Some permissions also take a list of permitted actions, such as "read" or "write", to fine-tune control even more. The permission java.security.AllPermission grants all permissions.

The default methods in this class deny all things to all people. You must explicitly grant permission for anything you want to be legal when subclassing this class.

Since:
1.0
See Also:
ClassLoader, SecurityException, checkTopLevelWindow(Object), System.getSecurityManager(), System.setSecurityManager(SecurityManager), AccessController, AccessControlContext, AccessControlException, Permission, BasicPermission, FilePermission, SocketPermission, PropertyPermission, RuntimePermission, AWTPermission, Policy, SecurityPermission, ProtectionDomain

Field Summary
protected  boolean inCheck
          Deprecated. Use checkPermission(Permission) instead.
 
Constructor Summary
SecurityManager()
          Construct a new security manager.
 
Method Summary
 void checkAccept(String host, int port)
          Check if the current thread is allowed to accept a connection from a particular host on a particular port.
 void checkAccess(Thread thread)
          Check if the current thread is allowed to modify another Thread.
 void checkAccess(ThreadGroup g)
          Check if the current thread is allowed to modify a ThreadGroup.
 void checkAwtEventQueueAccess()
          Check if the current thread is allowed to use the AWT event queue.
 void checkConnect(String host, int port)
          Check if the current thread is allowed to connect to a given host on a given port.
 void checkConnect(String host, int port, Object context)
          Check if the current thread is allowed to connect to a given host on a given port, using the given security context.
 void checkCreateClassLoader()
          Check if the current thread is allowed to create a ClassLoader.
 void checkDelete(String filename)
          Check if the current thread is allowed to delete the given file.
 void checkExec(String program)
          Check if the current thread is allowed to execute the given program.
 void checkExit(int status)
          Check if the current thread is allowed to exit the JVM with the given status.
 void checkLink(String filename)
          Check if the current thread is allowed to link in the given native library.
 void checkListen(int port)
          Check if the current thread is allowed to listen to a specific port for data.
 void checkMemberAccess(Class<?> c, int memberType)
          Check if the current thread is allowed to get certain types of Methods, Fields and Constructors from a Class object.
 void checkMulticast(InetAddress addr)
          Check if the current thread is allowed to read and write multicast to a particular address.
 void checkMulticast(InetAddress addr, byte ttl)
          Deprecated. use checkPermission(Permission) instead
 void checkPackageAccess(String packageName)
          Check if the current thread is allowed to access the specified package at all.
 void checkPackageDefinition(String packageName)
          Check if the current thread is allowed to define a class into the specified package.
 void checkPermission(Permission perm)
          Check if the current thread is allowed to perform an operation that requires the specified Permission.
 void checkPermission(Permission perm, Object context)
          Check if the current thread is allowed to perform an operation that requires the specified Permission.
 void checkPrintJobAccess()
          Check if the current thread is allowed to create a print job.
 void checkPropertiesAccess()
          Check if the current thread is allowed to read or write all the system properties at once.
 void checkPropertyAccess(String key)
          Check if the current thread is allowed to read a particular system property (writes are checked directly via checkPermission).
 void checkRead(FileDescriptor desc)
          Check if the current thread is allowed to read the given file using the FileDescriptor.
 void checkRead(String filename)
          Check if the current thread is allowed to read the given file.
 void checkRead(String filename, Object context)
          Check if the current thread is allowed to read the given file. using the given security context.
 void checkSecurityAccess(String action)
          Test whether a particular security action may be taken.
 void checkSetFactory()
          Check if the current thread is allowed to set the current socket factory.
 void checkSystemClipboardAccess()
          Check if the current thread is allowed to use the system clipboard.
 boolean checkTopLevelWindow(Object window)
          Check if the current thread is allowed to create a top-level window.
 void checkWrite(FileDescriptor desc)
          Check if the current thread is allowed to write the given file using the FileDescriptor.
 void checkWrite(String filename)
          Check if the current thread is allowed to write the given file.
protected  int classDepth(String className)
          Deprecated. use checkPermission(Permission) instead
protected  int classLoaderDepth()
          Deprecated. use checkPermission(Permission) instead
protected  ClassLoader currentClassLoader()
          Deprecated. use checkPermission(Permission) instead
protected  Class<?> currentLoadedClass()
          Deprecated. use checkPermission(Permission) instead
protected  Class[] getClassContext()
          Get a list of all the classes currently executing methods on the Java stack.
 boolean getInCheck()
          Deprecated. use checkPermission(Permission) instead
 Object getSecurityContext()
          Get an implementation-dependent Object that contains enough information about the current environment to be able to perform standard security checks later.
 ThreadGroup getThreadGroup()
          Get the ThreadGroup that a new Thread should belong to by default.
protected  boolean inClass(String className)
          Deprecated. use checkPermission(Permission) instead
protected  boolean inClassLoader()
          Deprecated. use checkPermission(Permission) instead
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

inCheck

protected boolean inCheck
Deprecated. Use checkPermission(Permission) instead.
Tells whether or not the SecurityManager is currently performing a security check.

Constructor Detail

SecurityManager

public SecurityManager()
Construct a new security manager. There may be a security check, of RuntimePermission("createSecurityManager").

Throws:
SecurityException - if permission is denied
Method Detail

getInCheck

public boolean getInCheck()
Deprecated. use checkPermission(Permission) instead

Tells whether or not the SecurityManager is currently performing a security check.

Returns:
true if the SecurityManager is in a security check
See Also:
inCheck

getClassContext

protected Class[] getClassContext()
Get a list of all the classes currently executing methods on the Java stack. getClassContext()[0] is the currently executing method (ie. the class that CALLED getClassContext, not SecurityManager).

Returns:
an array of classes on the Java execution stack

currentClassLoader

protected ClassLoader currentClassLoader()
Deprecated. use checkPermission(Permission) instead

Find the ClassLoader of the first non-system class on the execution stack. A non-system class is one whose ClassLoader is not equal to ClassLoader.getSystemClassLoader() or its ancestors. This will return null in three cases:

Returns:
the most recent non-system ClassLoader on the execution stack

currentLoadedClass

protected Class<?> currentLoadedClass()
Deprecated. use checkPermission(Permission) instead

Find the first non-system class on the execution stack. A non-system class is one whose ClassLoader is not equal to ClassLoader.getSystemClassLoader() or its ancestors. This will return null in three cases:

Returns:
the most recent non-system Class on the execution stack

classDepth

protected int classDepth(String className)
Deprecated. use checkPermission(Permission) instead

Get the depth of a particular class on the execution stack.

Parameters:
className - the fully-qualified name to search for
Returns:
the index of the class on the stack, or -1

classLoaderDepth

protected int classLoaderDepth()
Deprecated. use checkPermission(Permission) instead

Get the depth on the execution stack of the most recent non-system class. A non-system class is one whose ClassLoader is not equal to ClassLoader.getSystemClassLoader() or its ancestors. This will return -1 in three cases:

Returns:
the index of the most recent non-system Class on the stack

inClass

protected boolean inClass(String className)
Deprecated. use checkPermission(Permission) instead

Tell whether the specified class is on the execution stack.

Parameters:
className - the fully-qualified name of the class to find
Returns:
whether the specified class is on the execution stack

inClassLoader

protected boolean inClassLoader()
Deprecated. use checkPermission(Permission) instead

Tell whether there is a class loaded with an explicit ClassLoader on the stack.

Returns:
whether a class with an explicit ClassLoader is on the stack

getSecurityContext

public Object getSecurityContext()
Get an implementation-dependent Object that contains enough information about the current environment to be able to perform standard security checks later. This is used by trusted methods that need to verify that their callers have sufficient access to perform certain operations.

Currently the only methods that use this are checkRead() and checkConnect(). The default implementation returns an AccessControlContext.

Returns:
a security context
See Also:
checkConnect(String, int, Object), checkRead(String, Object), AccessControlContext, AccessController.getContext()

checkPermission

public void checkPermission(Permission perm)
Check if the current thread is allowed to perform an operation that requires the specified Permission. This defaults to AccessController.checkPermission.

Parameters:
perm - the Permission required
Throws:
SecurityException - if permission is denied
NullPointerException - if perm is null
Since:
1.2

checkPermission

public void checkPermission(Permission perm,
                            Object context)
Check if the current thread is allowed to perform an operation that requires the specified Permission. This is done in a context previously returned by getSecurityContext(). The default implementation expects context to be an AccessControlContext, and it calls AccessControlContext.checkPermission(perm).

Parameters:
perm - the Permission required
context - a security context
Throws:
SecurityException - if permission is denied, or if context is not an AccessControlContext
NullPointerException - if perm is null
Since:
1.2
See Also:
getSecurityContext(), AccessControlContext.checkPermission(Permission)

checkCreateClassLoader

public void checkCreateClassLoader()
Check if the current thread is allowed to create a ClassLoader. This method is called from ClassLoader.ClassLoader(), and checks RuntimePermission("createClassLoader"). If you override this, you should call super.checkCreateClassLoader() rather than throwing an exception.

Throws:
SecurityException - if permission is denied
See Also:
ClassLoader.ClassLoader()

checkAccess

public void checkAccess(Thread thread)
Check if the current thread is allowed to modify another Thread. This is called by Thread.stop(), suspend(), resume(), interrupt(), destroy(), setPriority(), setName(), and setDaemon(). The default implementation checks RuntimePermission("modifyThread") on system threads (ie. threads in ThreadGroup with a null parent), and returns silently on other threads.

If you override this, you must do two things. First, call super.checkAccess(t), to make sure you are not relaxing requirements. Second, if the calling thread has RuntimePermission("modifyThread"), return silently, so that core classes (the Classpath library!) can modify any thread.

Parameters:
thread - the other Thread to check
Throws:
SecurityException - if permission is denied
NullPointerException - if thread is null
See Also:
Thread.stop(), Thread.suspend(), Thread.resume(), Thread.setPriority(int), Thread.setName(String), Thread.setDaemon(boolean)

checkAccess

public void checkAccess(ThreadGroup g)
Check if the current thread is allowed to modify a ThreadGroup. This is called by Thread.Thread() (to add a thread to the ThreadGroup), ThreadGroup.ThreadGroup() (to add this ThreadGroup to a parent), ThreadGroup.stop(), suspend(), resume(), interrupt(), destroy(), setDaemon(), and setMaxPriority(). The default implementation checks RuntimePermission("modifyThread") on the system group (ie. the one with a null parent), and returns silently on other groups.

If you override this, you must do two things. First, call super.checkAccess(t), to make sure you are not relaxing requirements. Second, if the calling thread has RuntimePermission("modifyThreadGroup"), return silently, so that core classes (the Classpath library!) can modify any thread.

Parameters:
g - the ThreadGroup to check
Throws:
SecurityException - if permission is denied
NullPointerException - if g is null
See Also:
Thread.Thread(), ThreadGroup.ThreadGroup(String), ThreadGroup.stop(), ThreadGroup.suspend(), ThreadGroup.resume(), ThreadGroup.interrupt(), ThreadGroup.setDaemon(boolean), ThreadGroup.setMaxPriority(int)

checkExit

public void checkExit(int status)
Check if the current thread is allowed to exit the JVM with the given status. This method is called from Runtime.exit() and Runtime.halt(). The default implementation checks RuntimePermission("exitVM"). If you override this, call super.checkExit rather than throwing an exception.

Parameters:
status - the status to exit with
Throws:
SecurityException - if permission is denied
See Also:
Runtime.exit(int), Runtime.halt(int)

checkExec

public void checkExec(String program)
Check if the current thread is allowed to execute the given program. This method is called from Runtime.exec(). If the name is an absolute path, the default implementation checks FilePermission(program, "execute"), otherwise it checks FilePermission("<<ALL FILES>>", "execute"). If you override this, call super.checkExec rather than throwing an exception.

Parameters:
program - the name of the program to exec
Throws:
SecurityException - if permission is denied
NullPointerException - if program is null
See Also:
Runtime.exec(String[], String[], File)

checkLink

public void checkLink(String filename)
Check if the current thread is allowed to link in the given native library. This method is called from Runtime.load() (and hence, by loadLibrary() as well). The default implementation checks RuntimePermission("loadLibrary." + filename). If you override this, call super.checkLink rather than throwing an exception.

Parameters:
filename - the full name of the library to load
Throws:
SecurityException - if permission is denied
NullPointerException - if filename is null
See Also:
Runtime.load(String)

checkRead

public void checkRead(FileDescriptor desc)
Check if the current thread is allowed to read the given file using the FileDescriptor. This method is called from FileInputStream.FileInputStream(). The default implementation checks RuntimePermission("readFileDescriptor"). If you override this, call super.checkRead rather than throwing an exception.

Parameters:
desc - the FileDescriptor representing the file to access
Throws:
SecurityException - if permission is denied
NullPointerException - if desc is null
See Also:
FileInputStream.FileInputStream(FileDescriptor)

checkRead

public void checkRead(String filename)
Check if the current thread is allowed to read the given file. This method is called from FileInputStream.FileInputStream(), RandomAccessFile.RandomAccessFile(), File.exists(), canRead(), isFile(), isDirectory(), lastModified(), length() and list(). The default implementation checks FilePermission(filename, "read"). If you override this, call super.checkRead rather than throwing an exception.

Parameters:
filename - the full name of the file to access
Throws:
SecurityException - if permission is denied
NullPointerException - if filename is null
See Also:
File, FileInputStream.FileInputStream(String), RandomAccessFile.RandomAccessFile(String, String)

checkRead

public void checkRead(String filename,
                      Object context)
Check if the current thread is allowed to read the given file. using the given security context. The context must be a result of a previous call to getSecurityContext(). The default implementation checks AccessControlContext.checkPermission(new FilePermission(filename, "read")). If you override this, call super.checkRead rather than throwing an exception.

Parameters:
filename - the full name of the file to access
context - the context to determine access for
Throws:
SecurityException - if permission is denied, or if context is not an AccessControlContext
NullPointerException - if filename is null
See Also:
getSecurityContext(), AccessControlContext.checkPermission(Permission)

checkWrite

public void checkWrite(FileDescriptor desc)
Check if the current thread is allowed to write the given file using the FileDescriptor. This method is called from FileOutputStream.FileOutputStream(). The default implementation checks RuntimePermission("writeFileDescriptor"). If you override this, call super.checkWrite rather than throwing an exception.

Parameters:
desc - the FileDescriptor representing the file to access
Throws:
SecurityException - if permission is denied
NullPointerException - if desc is null
See Also:
FileOutputStream.FileOutputStream(FileDescriptor)

checkWrite

public void checkWrite(String filename)
Check if the current thread is allowed to write the given file. This method is called from FileOutputStream.FileOutputStream(), RandomAccessFile.RandomAccessFile(), File.canWrite(), mkdir(), and renameTo(). The default implementation checks FilePermission(filename, "write"). If you override this, call super.checkWrite rather than throwing an exception.

Parameters:
filename - the full name of the file to access
Throws:
SecurityException - if permission is denied
NullPointerException - if filename is null
See Also:
File, File.canWrite(), File.mkdir(), File.renameTo(File), FileOutputStream.FileOutputStream(String), RandomAccessFile.RandomAccessFile(String, String)

checkDelete

public void checkDelete(String filename)
Check if the current thread is allowed to delete the given file. This method is called from File.delete(). The default implementation checks FilePermission(filename, "delete"). If you override this, call super.checkDelete rather than throwing an exception.

Parameters:
filename - the full name of the file to delete
Throws:
SecurityException - if permission is denied
NullPointerException - if filename is null
See Also:
File.delete()

checkConnect

public void checkConnect(String host,
                         int port)
Check if the current thread is allowed to connect to a given host on a given port. This method is called from Socket.Socket(). A port number of -1 indicates the caller is attempting to determine an IP address, so the default implementation checks SocketPermission(host, "resolve"). Otherwise, the default implementation checks SocketPermission(host + ":" + port, "connect"). If you override this, call super.checkConnect rather than throwing an exception.

Parameters:
host - the host to connect to
port - the port to connect on
Throws:
SecurityException - if permission is denied
NullPointerException - if host is null
See Also:
Socket.Socket()

checkConnect

public void checkConnect(String host,
                         int port,
                         Object context)
Check if the current thread is allowed to connect to a given host on a given port, using the given security context. The context must be a result of a previous call to getSecurityContext. A port number of -1 indicates the caller is attempting to determine an IP address, so the default implementation checks AccessControlContext.checkPermission(new SocketPermission(host, "resolve")). Otherwise, the default implementation checks AccessControlContext.checkPermission(new SocketPermission(host + ":" + port, "connect")). If you override this, call super.checkConnect rather than throwing an exception.

Parameters:
host - the host to connect to
port - the port to connect on
context - the context to determine access for
Throws:
SecurityException - if permission is denied, or if context is not an AccessControlContext
NullPointerException - if host is null
See Also:
getSecurityContext(), AccessControlContext.checkPermission(Permission)

checkListen

public void checkListen(int port)
Check if the current thread is allowed to listen to a specific port for data. This method is called by ServerSocket.ServerSocket(). The default implementation checks SocketPermission("localhost:" + (port == 0 ? "1024-" : "" + port), "listen"). If you override this, call super.checkListen rather than throwing an exception.

Parameters:
port - the port to listen on
Throws:
SecurityException - if permission is denied
See Also:
ServerSocket.ServerSocket(int)

checkAccept

public void checkAccept(String host,
                        int port)
Check if the current thread is allowed to accept a connection from a particular host on a particular port. This method is called by ServerSocket.implAccept(). The default implementation checks SocketPermission(host + ":" + port, "accept"). If you override this, call super.checkAccept rather than throwing an exception.

Parameters:
host - the host which wishes to connect
port - the port the connection will be on
Throws:
SecurityException - if permission is denied
NullPointerException - if host is null
See Also:
ServerSocket.accept()

checkMulticast

public void checkMulticast(InetAddress addr)
Check if the current thread is allowed to read and write multicast to a particular address. The default implementation checks SocketPermission(addr.getHostAddress(), "accept,connect"). If you override this, call super.checkMulticast rather than throwing an exception.

Parameters:
addr - the address to multicast to
Throws:
SecurityException - if permission is denied
NullPointerException - if host is null
Since:
1.1

checkMulticast

public void checkMulticast(InetAddress addr,
                           byte ttl)
Deprecated. use checkPermission(Permission) instead

Check if the current thread is allowed to read and write multicast to a particular address with a particular ttl (time-to-live) value. The default implementation ignores ttl, and checks SocketPermission(addr.getHostAddress(), "accept,connect"). If you override this, call super.checkMulticast rather than throwing an exception.

Parameters:
addr - the address to multicast to
ttl - value in use for multicast send
Throws:
SecurityException - if permission is denied
NullPointerException - if host is null
Since:
1.1

checkPropertiesAccess

public void checkPropertiesAccess()
Check if the current thread is allowed to read or write all the system properties at once. This method is called by System.getProperties() and setProperties(). The default implementation checks PropertyPermission("*", "read,write"). If you override this, call super.checkPropertiesAccess rather than throwing an exception.

Throws:
SecurityException - if permission is denied
See Also:
System.getProperties(), System.setProperties(Properties)

checkPropertyAccess

public void checkPropertyAccess(String key)
Check if the current thread is allowed to read a particular system property (writes are checked directly via checkPermission). This method is called by System.getProperty() and setProperty(). The default implementation checks PropertyPermission(key, "read"). If you override this, call super.checkPropertyAccess rather than throwing an exception.

Parameters:
key - the key of the property to check
Throws:
SecurityException - if permission is denied
NullPointerException - if key is null
IllegalArgumentException - if key is ""
See Also:
System.getProperty(String)

checkTopLevelWindow

public boolean checkTopLevelWindow(Object window)
Check if the current thread is allowed to create a top-level window. If it is not, the operation should still go through, but some sort of nonremovable warning should be placed on the window to show that it is untrusted. This method is called by Window.Window(). The default implementation checks AWTPermission("showWindowWithoutWarningBanner"), and returns true if no exception was thrown. If you override this, use return super.checkTopLevelWindow rather than returning false.

Parameters:
window - the window to create
Returns:
true if there is permission to show the window without warning
Throws:
NullPointerException - if window is null
See Also:
Window.Window(java.awt.Frame)

checkPrintJobAccess

public void checkPrintJobAccess()
Check if the current thread is allowed to create a print job. This method is called by Toolkit.getPrintJob(). The default implementation checks RuntimePermission("queuePrintJob"). If you override this, call super.checkPrintJobAccess rather than throwing an exception.

Throws:
SecurityException - if permission is denied
Since:
1.1
See Also:
Toolkit.getPrintJob(java.awt.Frame, String, Properties)

checkSystemClipboardAccess

public void checkSystemClipboardAccess()
Check if the current thread is allowed to use the system clipboard. This method is called by Toolkit.getSystemClipboard(). The default implementation checks AWTPermission("accessClipboard"). If you override this, call super.checkSystemClipboardAccess rather than throwing an exception.

Throws:
SecurityException - if permission is denied
Since:
1.1
See Also:
Toolkit.getSystemClipboard()

checkAwtEventQueueAccess

public void checkAwtEventQueueAccess()
Check if the current thread is allowed to use the AWT event queue. This method is called by Toolkit.getSystemEventQueue(). The default implementation checks AWTPermission("accessEventQueue"). you override this, call super.checkAwtEventQueueAccess rather than throwing an exception.

Throws:
SecurityException - if permission is denied
Since:
1.1
See Also:
Toolkit.getSystemEventQueue()

checkPackageAccess

public void checkPackageAccess(String packageName)
Check if the current thread is allowed to access the specified package at all. This method is called by ClassLoader.loadClass() in user-created ClassLoaders. The default implementation gets a list of all restricted packages, via Security.getProperty("package.access"). Then, if packageName starts with or equals any restricted package, it checks RuntimePermission("accessClassInPackage." + packageName). If you override this, you should call super.checkPackageAccess before doing anything else.

Parameters:
packageName - the package name to check access to
Throws:
SecurityException - if permission is denied
NullPointerException - if packageName is null
See Also:
ClassLoader.loadClass(String, boolean), Security.getProperty(String)

checkPackageDefinition

public void checkPackageDefinition(String packageName)
Check if the current thread is allowed to define a class into the specified package. This method is called by ClassLoader.loadClass() in user-created ClassLoaders. The default implementation gets a list of all restricted packages, via Security.getProperty("package.definition"). Then, if packageName starts with or equals any restricted package, it checks RuntimePermission("defineClassInPackage." + packageName). If you override this, you should call super.checkPackageDefinition before doing anything else.

Parameters:
packageName - the package name to check access to
Throws:
SecurityException - if permission is denied
NullPointerException - if packageName is null
See Also:
ClassLoader.loadClass(String, boolean), Security.getProperty(String)

checkSetFactory

public void checkSetFactory()
Check if the current thread is allowed to set the current socket factory. This method is called by Socket.setSocketImplFactory(), ServerSocket.setSocketFactory(), and URL.setURLStreamHandlerFactory(). The default implementation checks RuntimePermission("setFactory"). If you override this, call super.checkSetFactory rather than throwing an exception.

Throws:
SecurityException - if permission is denied
See Also:
Socket.setSocketImplFactory(SocketImplFactory), ServerSocket.setSocketFactory(SocketImplFactory), URL.setURLStreamHandlerFactory(URLStreamHandlerFactory)

checkMemberAccess

public void checkMemberAccess(Class<?> c,
                              int memberType)
Check if the current thread is allowed to get certain types of Methods, Fields and Constructors from a Class object. This method is called by Class.getMethod[s](), Class.getField[s](), Class.getConstructor[s], Class.getDeclaredMethod[s](), Class.getDeclaredField[s](), and Class.getDeclaredConstructor[s](). The default implementation allows PUBLIC access, and access to classes defined by the same classloader as the code performing the reflection. Otherwise, it checks RuntimePermission("accessDeclaredMembers"). If you override this, do not call super.checkMemberAccess, as this would mess up the stack depth check that determines the ClassLoader requesting the access.

Parameters:
c - the Class to check
memberType - either DECLARED or PUBLIC
Throws:
SecurityException - if permission is denied, including when memberType is not DECLARED or PUBLIC
NullPointerException - if c is null
Since:
1.1
See Also:
Class, Member.DECLARED, Member.PUBLIC

checkSecurityAccess

public void checkSecurityAccess(String action)
Test whether a particular security action may be taken. The default implementation checks SecurityPermission(action). If you override this, call super.checkSecurityAccess rather than throwing an exception.

Parameters:
action - the desired action to take
Throws:
SecurityException - if permission is denied
NullPointerException - if action is null
IllegalArgumentException - if action is ""
Since:
1.1

getThreadGroup

public ThreadGroup getThreadGroup()
Get the ThreadGroup that a new Thread should belong to by default. Called by Thread.Thread(). The default implementation returns the current ThreadGroup of the current Thread. Spec Note: it is not clear whether the new Thread is guaranteed to pass the checkAccessThreadGroup() test when using this ThreadGroup, but I presume so.

Returns:
the ThreadGroup to put the new Thread into
Since:
1.1