private member access via weaving (aspects)

AccessGetter.java

((PrivateMessageExposer)privateClass).getPrivateMessage(); 

PrivateMemberAccessByWeaving.java

public privileged aspect SomeClassExposerAspect {
 
  String around(PrivateMessageExposer obj)
    : execution(public String getPrivateMessage()) && target(obj) {        
       try {
          // use privileged access to return the private member
          return ((SomeClass )obj).privateMessage;
       }
       // safeguard against unexpected 3rd party library versions, if using load-time weaving
       catch (NoSuchMethodError e) {
          //log something
          return null;
       }
   }

  // necessary for compilation to pass
  public String  PrivateMessageExposer.getPrivateMessage() {
    log.severe("This method is a dummy implementation. It should never be called as the advice never calls proceed()");
    return null;
  }

  declare parents : SomeClass implements PrivateMessageExposer;
}
 

PrivateMessageExposer.java

public interface PrivateMessageExposer {
  public String  getPrivateMessage();        
}

SomeClass.java

public class SomeClass { 
  private String privateMessage = "you can see me?!";
}