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- Java.lang - SecurityManager
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Java SecurityManager checkSecurityAccess() Method
Description
The Java SecurityManager checkSecurityAccess(String target) method determines whether the permission with the specified permission target name should be granted or denied. If the requested permission is allowed, this method returns quietly. If denied, a SecurityException is raised. This method creates a SecurityPermission object for the given permission target name and calls checkPermission with it.
Declaration
Following is the declaration for java.lang.SecurityManager.checkSecurityAccess() method
public void checkSecurityAccess(String target)
Parameters
target − the target name of the SecurityPermission.
Return Value
This method does not return a value.
Exception
SecurityException − if the calling thread does not have permission for the requested access.
NullPointerException − if target is null.
IllegalArgumentException − if target is empty
Example
Our examples require that the permissions for each command is blocked. A new policy file was set that allows only the creating and setting of our Security Manager. The file is in C:/java.policy and contains the following text −
grant { permission java.lang.RuntimePermission "setSecurityManager"; permission java.lang.RuntimePermission "createSecurityManager"; permission java.lang.RuntimePermission "usePolicy"; };
The following example shows the usage of lang.SecurityManager.checkSecurityAccess() method.
package com.tutorialspoint; public class SecurityManagerDemo extends SecurityManager { public static void main(String[] args) { // set the policy file as the system securuty policy System.setProperty("java.security.policy", "file:/C:/java.policy"); // create a security manager SecurityManagerDemo sm = new SecurityManagerDemo(); // set the system security manager System.setSecurityManager(sm); // perform the check sm.checkSecurityAccess("read"); // print a message if we passed the check System.out.println("Allowed!"); } }
Output
Let us compile and run the above program, this will produce the following result −
Exception in thread "main" java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release at java.base/java.lang.System.setSecurityManager(System.java:430) at com.tutorialspoint.SecurityManagerDemo.main(SecurityManagerDemo.java:14)
Note − Security Manager has been deprecated since version 17 and marked for removal.