SecurityManager

AI-generated Key Takeaways

• SecurityManager is a legacy class for enforcing security policies in Java applications and is not recommended for use in new code.

• It provides methods to check various operations like access to resources, network connections, and thread management.

• Many SecurityManager methods are deprecated and developers should now use checkPermission with appropriate permissions.

• SecurityManager allows for granular control over actions performed within a Java application, but its complexity and legacy status discourage its general usage.

• Modern security mechanisms, like those provided by the Java security architecture, offer more robust and maintainable alternatives.

public class SecurityManager extends Object

Legacy security code; do not use.

Field Summary

protected boolean

inCheck

This field is deprecated. Use checkPermission(Permission) instead.

Public Constructor Summary

SecurityManager()

Public Method Summary

void	checkAccept(String host, int port)
void	checkAccess(Thread t)
void	checkAccess(ThreadGroup g)
void	checkAwtEventQueueAccess()
void	checkConnect(String host, int port)
void	checkConnect(String host, int port, Object context)
void	checkCreateClassLoader()
void	checkDelete(String file)
void	checkExec(String cmd)
void	checkExit(int status)
void	checkLink(String lib)
void	checkListen(int port)
void	checkMemberAccess(Class<?> clazz, int which)
void	checkMulticast(InetAddress maddr)
void	checkMulticast(InetAddress maddr, byte ttl) This method is deprecated. use checkMulticast(java.net.InetAddress) instead.
void	checkPackageAccess(String pkg)
void	checkPackageDefinition(String pkg)
void	checkPermission(Permission perm, Object context)
void	checkPermission(Permission perm)
void	checkPrintJobAccess()
void	checkPropertiesAccess()
void	checkPropertyAccess(String key)
void	checkRead(FileDescriptor fd)
void	checkRead(String file)
void	checkRead(String file, Object context)
void	checkSecurityAccess(String target)
void	checkSetFactory()
void	checkSystemClipboardAccess()
boolean	checkTopLevelWindow(Object window)
void	checkWrite(FileDescriptor fd)
void	checkWrite(String file)
boolean	getInCheck() This method is deprecated. Use checkPermission(Permission) instead.
Object	getSecurityContext()
ThreadGroup	getThreadGroup() Returns the current thread's thread group.

Protected Method Summary

int	classDepth(String name) This method is deprecated. Use checkPermission(Permission) instead.
int	classLoaderDepth() This method is deprecated. Use checkPermission(Permission) instead.
ClassLoader	currentClassLoader() This method is deprecated. Use checkPermission(Permission) instead.
Class<?>	currentLoadedClass() This method is deprecated. Use checkPermission(Permission) instead.
Class[]	getClassContext()
boolean	inClass(String name) This method is deprecated. Use checkPermission(Permission) instead.
boolean	inClassLoader() This method is deprecated. Use checkPermission(Permission) instead.

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Fields

protected boolean inCheck

This field is deprecated.
Use checkPermission(Permission) instead.

Public Constructors

public SecurityManager ()

Public Methods

public void checkAccept (String host, int port)

Parameters

host
port

public void checkAccess (Thread t)

Parameters

t

public void checkAccess (ThreadGroup g)

Parameters

g

public void checkAwtEventQueueAccess ()

public void checkConnect (String host, int port)

Parameters

host
port

public void checkConnect (String host, int port, Object context)

Parameters

host
port
context

public void checkCreateClassLoader ()

public void checkDelete (String file)

Parameters

file

public void checkExec (String cmd)

Parameters

cmd

public void checkExit (int status)

Parameters

status

public void checkLink (String lib)

Parameters

lib

public void checkListen (int port)

Parameters

port

public void checkMemberAccess (Class<?> clazz, int which)

Parameters

clazz
which

public void checkMulticast (InetAddress maddr)

Parameters

maddr

public void checkMulticast (InetAddress maddr, byte ttl)

This method is deprecated.
use checkMulticast(java.net.InetAddress) instead.

Parameters

maddr
ttl

public void checkPackageAccess (String pkg)

Parameters

pkg

public void checkPackageDefinition (String pkg)

Parameters

pkg

public void checkPermission (Permission perm, Object context)

Parameters

perm
context

public void checkPermission (Permission perm)

Parameters

perm

public void checkPrintJobAccess ()

public void checkPropertiesAccess ()

public void checkPropertyAccess (String key)

Parameters

key

public void checkRead (FileDescriptor fd)

Parameters

fd

public void checkRead (String file)

Parameters

file

public void checkRead (String file, Object context)

Parameters

file
context

public void checkSecurityAccess (String target)

Parameters

target

public void checkSetFactory ()

public void checkSystemClipboardAccess ()

public boolean checkTopLevelWindow (Object window)

Parameters

window

public void checkWrite (FileDescriptor fd)

Parameters

fd

public void checkWrite (String file)

Parameters

file

public boolean getInCheck ()

This method is deprecated.
Use checkPermission(Permission) instead.

public Object getSecurityContext ()

public ThreadGroup getThreadGroup ()

Returns the current thread's thread group.

Protected Methods

protected int classDepth (String name)

This method is deprecated.
Use checkPermission(Permission) instead.

Parameters

name

protected int classLoaderDepth ()

This method is deprecated.
Use checkPermission(Permission) instead.

protected ClassLoader currentClassLoader ()

This method is deprecated.
Use checkPermission(Permission) instead.

protected Class<?> currentLoadedClass ()

This method is deprecated.
Use checkPermission(Permission) instead.

protected Class[] getClassContext ()

protected boolean inClass (String name)

This method is deprecated.
Use checkPermission(Permission) instead.

Parameters

name

protected boolean inClassLoader ()

This method is deprecated.
Use checkPermission(Permission) instead.