Java Reflection Security Manager

java security

By default, the security manager is not loaded for an application. It allows to access all fields, methods, and constructors of a class after setting the accessible flag to true.

Using the following code to check whether the security manager has been loadded or not.

SecurityManager smgr = System.getSecurityManager();
if (smgr == null) {
  System.out.println("Security manager is not loaded.");

}

By passing the -Djava.security.manager option and -Djava.security.policy option on the command line to load the Security Manager for an application.

java -Djava.security.manager
    -Djava.security.policy=conf/myapp.policy
    com.myapp.Application

Example of conf/myapp.policy

grant {
  // Grant permission to all programs to access inaccessible members
  permission java.lang.reflect.ReflectPermission "SuppressAccessChecks";

}

Reference:

https://www.demo2s.com/java/java-reflection-security-manager.html

Written on January 19, 2023