Examples of java.security.PrivilegedAction

java.security.PrivilegedAction
A computation to be performed with privileges enabled. The computation is performed by invoking AccessController.doPrivileged on the PrivilegedAction object. This interface is used only for computations that do not throw checked exceptions; computations that throw checked exceptions must use PrivilegedExceptionAction instead. @see AccessController @see AccessController#doPrivileged(PrivilegedAction) @see PrivilegedExceptionAction

    }


    private static Package defineSystemPackage(final String iname,
                 final String fn)
    {
  return (Package) AccessController.doPrivileged(new PrivilegedAction() {
      public Object run() {
    String name = iname;
    // Get the cached code source url for the file name
    URL url = (URL)urls.get(fn);
    if (url == null) {

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                             * Event processing is done inside doPrivileged block so that
                             * it wouldn't matter even if user code is on the stack 
                             * Fix for BugId 6300270
                             */


                             AccessController.doPrivileged(new PrivilegedAction() {
                                     public Object run() {
                                        pumpEventsForFilter.run();
                                        return null;
                                     }
                             });

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     * override security-sensitive non-final methods.  Returns true if the
     * subclass overrides any of the methods, false otherwise.
     */
    private static boolean auditSubclass(final Class subcl) {
  Boolean result = (Boolean) AccessController.doPrivileged(
      new PrivilegedAction() {
    public Object run() {
        for (Class cl = subcl;
       cl != Thread.class;
       cl = cl.getSuperclass())
        {

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     * @return the result of applying the action to the target
     * 
     * @see EventHandler
     */
    public Object invoke(final Object proxy, final Method method, final Object[] arguments) {
  return AccessController.doPrivileged(new PrivilegedAction() {
      public Object run() {
          return invokeInternal(proxy, method, arguments);
      }
  }, acc);
    }

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  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}));

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        throw new UnsatisfiedLinkError("no " + name + " in java.library.path");
    }


    private static boolean loadLibrary0(Class fromClass, final File file) {
  Boolean exists = (Boolean)
      AccessController.doPrivileged(new PrivilegedAction() {
    public Object run() {
        return new Boolean(file.exists());
    }
      });
  if (!exists.booleanValue()) {

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        final Class interfaceClass = mxbeanInterface;
        // Only allow MXBean interfaces from rt.jar loaded by the
        // bootstrap class loader
        final ClassLoader loader = (ClassLoader)
            AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() { 
                    return interfaceClass.getClassLoader();
                }
            });
        if (loader != null) {

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    private static PropertyDescriptor[] getPropertyDescriptors(final Class secJavaType)
    {
        return (
            PropertyDescriptor[]) AccessController
                .doPrivileged(new PrivilegedAction()
        {
            public Object run()
            {
                PropertyDescriptor[] result = null;
                // START FIX http://nagoya.apache.org/bugzilla/showattachment.cgi?attach_id=4937

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            for (final Field field : klass.getDeclaredFields()) {
                if ((field.getModifiers() & Modifier.STATIC) == 0) {
                    if (groovyObject && field.getName().equals("metaClass")) {
                        continue;
                    }
                    AccessController.doPrivileged(new PrivilegedAction() {
                        public Object run() {
                            field.setAccessible(true);
                            return null;
                        }
                    });

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        //  code in a privileged action so it is not necessary for the calling code
        //  to have the same privileges as the wrapper jar.
        // This is safe because this method can only be called once and that one call
        //  will presumably be made on JVM startup.
        AccessController.doPrivileged(
            new PrivilegedAction() {
                public Object run() {
                    privilegedStart( listener, args );
                    return null;
                }
            }

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