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Java SecurityManager checkAwtEventQueueAccess() method with example

SecurityManager Class checkAwtEventQueueAccess() method: Here, we are going to learn about the checkAwtEventQueueAccess() method of SecurityManager Class with its syntax and example.
Submitted by Preeti Jain, on December 15, 2019

SecurityManager Class checkAwtEventQueueAccess() method

• checkAwtEventQueueAccess() method is available in java.lang package.
• checkAwtEventQueueAccess() method is used to access AWT(Abstract Window Toolkit) event queue by calling checkPermission with AWTPermission(“accessEventQueue”).
• checkAwtEventQueueAccess() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• checkAwtEventQueueAccess() method may throw an exception at the time of accessing the AWT event queue.
  SecurityException – This exception may throw when the calling thread is not allowed to access the AWT event queue.

Syntax:

    public void checkAwtEventQueueAccess();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void checkAwtEventQueueAccess()
// method of SecurityManager 

public class CheckAwtEventQueueAccess {
    public static void main(String[] args) {
        // By using setProperty() method is to set the policy property 
        // with security manager
        System.setProperty("java.security.policy", "file:/C:/java.policy");

        // Instantiating a SecurityManager object
        SecurityManager smgr = new SecurityManager();

        // By using setSecurityManager() method is to set the
        // security manager
        System.setSecurityManager(smgr);

        // By using CheckAwtEventQueueAccess() method is to check 
        // that awt event queue is accessed or not
        smgr.checkAwtEventQueueAccess();

        // Display the message when queue is acessible
        System.out.println("Not Restricted..");
    }
}

Output

Exception in thread "main" java.security.AccessControlException: access denied (
java.awt.AWTPermission accessEventQueue)
        at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:264)
        at java.security.AccessController.checkPermission(AccessController.java:
427)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
        at java.lang.SecurityManager.checkAwtEventQueueAccess(SecurityManager.ja
va:1398)
        at CheckAwtEventQueueAccess.main(CheckAwtEventQueueAccess.java:18)