Home » Java programming language

Java SecurityManager checkPropertyAccess() method with example

SecurityManager Class checkPropertyAccess() method: Here, we are going to learn about the checkPropertyAccess() method of SecurityManager Class with its syntax and example.
Submitted by Preeti Jain, on December 17, 2019

SecurityManager Class checkPropertyAccess() method

• checkPropertyAccess() method is available in java.lang package.
• checkPropertyAccess() method calls checkPermission with PropertyPermission(prop_name,"read") and it is used by the method getProperty() of System class.
• checkPropertyAccess() 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.
• checkPropertyAccess() method may throw an exception at the time of accessing system property.
  • SecurityException – This exception may throw when the calling thread is not allowed to access the system property with the given system property name.
  • NullPointerException – This exception may throw when the given parameter prop_name is null.
  • IllegalArgumentException – This exception may throw when the given prop_name is blank or empty.

Syntax:

    public void checkPropertyAccess(String prop_name);

Parameter(s):

• String prop_name – represents the system property name.

Return value:

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

Example:

// Java program to demonstrate the example 
// of void checkPropertyAccess(String prop_name)
// method of SecurityManager 

public class CheckPropertyAccess extends SecurityManager {
    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 CheckPropertyAccess object
        CheckPropertyAccess cpa = new CheckPropertyAccess();

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

        // By using checkPropertyAccess(string sys_prop) method is to //check
        // system property access
        cpa.checkPropertyAccess("java.runtime.version");

        // Display the message
        System.out.println("Not Restricted..");
    }
}

Output

Exception in thread "main" java.security.AccessControlException: access denied ("java.util.PropertyPermission" "java.runtime.version" "read")
	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.checkPropertyAccess(SecurityManager.java:1066)
	at CheckPropertyAccess.main(CheckPropertyAccess.java:21)