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 import java.security.*;

public class Trusted {

   public static void loadLibrary(final String library){
      AccessController.doPrivileged(new PrivilegedAction<Void>() {
         public Void run() {
             System.loadLibrary(library);
             return null;
         }
      });
   }
}

////////////////////////////////////////////////////////////////////////////////////

public class Untrusted {
   static{
      System.setProperty("java.security.policy", "java.policy");
      SecurityManager sm = new SecurityManager();
      System.setSecurityManager(sm);
      System.out.println("Allowed!");
   }

   private native void sayHello();

   public static void main(String[] args) {
      String library = new String("HelloImpl");
      Trusted.loadLibrary(library);
      new Untrusted.sayHello();  // invoke the native method
   }
}