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Java SecurityManager checkAccept() method with example

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

SecurityManager Class checkAccept() method

• checkAccept() method is available in java.lang package.
• checkAccept() method of ServerSocket class is called for the current security manager and it calls checkPermission with the SocketPermission(host_add+":"+port_no,"accept").
• checkAccept() 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.
• checkAccept() method may throw an exception at the time of establishing a server connection.
  • SecurityException – This exception may throw when the calling thread is not allowed to accept the connection.
  • NullPointerException – This exception may throw when the given first parameter is null.

Syntax:

    public void checkAccept(String host_add, int port_no);

Parameter(s):

• String host_add – represents the hostname of the socket connection.
• int port_no – represents the port number of the socket connection.

Return value:

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

Example:

// Java program to demonstrate the example 
// of void checkAccept(String host_add, int port_no)
// method of SecurityManager 

public class CheckAccept {
    public static void main(String[] args) {
        String host_add = "www.includehelp.com";
        int port_no = 8080;

        // 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 checkAccept() method is to check that
        // socket connection is enabled or not
        smgr.checkAccept(host_add, port_no);

        // Display the message when connection is enabled
        System.out.println("Accepted..");
    }
}

Output

Exception in thread "main" java.security.AccessControlException: access denied ("java.net.SocketPermission" "www.includehelp.com:8080" "accept,resolve")
	at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
	at java.base/java.security.AccessController.checkPermission(AccessController.java:897)
	at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:322)
	at java.base/java.lang.SecurityManager.checkAccept(SecurityManager.java:940)
	at CheckAccept.main(CheckAccept.java:23)