[jboss-user] [JBoss AOP] - IllegalAccessException using reflection on private field

[jxhill]

I have an app that relies heavily on reflection.  I want to use AOP with it, but I get an error when accessing a private variable through java.lang.reflect.Field.  It appears that aspects disables the call to Field.setAccessible();  The following sample code works fine until I apply aspects.


  | // TestObject.java
  | package test;
  | 
  | public class TestObject
  | {
  |   @SuppressWarnings("unused")
  |   private String testField = "Initial Value";
  | }
  | 

  | // TestAspect.java
  | package test;
  | 
  | import org.jboss.aop.joinpoint.FieldReadInvocation;
  | import org.jboss.aop.joinpoint.FieldWriteInvocation;
  | 
  | public class TestAspect
  | {
  |   public Object accessField(FieldReadInvocation invocation) throws Throwable
  |   {
  |     return invocation.invokeNext();
  |   }
  |   
  |   public Object accessField(FieldWriteInvocation invocation) throws Throwable
  |   {
  |     return invocation.invokeNext();
  |   }
  | }
  | 

  | // Main.java
  | package test;
  | 
  | import java.lang.reflect.Field;
  | 
  | public class Main
  | {
  |   public static void main(String[] args)
  |   {
  |     TestObject test = new TestObject();
  |     
  |     fieldReadTest(test);
  |     out("");
  |     fieldWriteTest(test, "Some new value");
  |     out("");
  |     fieldReadTest(test);
  |   }
  |   
  |   public static void fieldWriteTest(TestObject test, Object newValue)
  |   {
  |     infoOut("Begin Field Write Test");
  |     
  |     try
  |     {
  |       Field f = TestObject.class.getDeclaredField("testField");
  |       f.setAccessible(true);
  |       f.set(test, newValue);
  |       infoOut("End Field Write Test - Success")
  | ;    }
  |     catch(Exception e)
  |     {
  |       out(e);
  |       infoOut("End Field Write Test - FAILED");
  |     }
  |   }
  |   
  |   public static void fieldReadTest(TestObject test)
  |   {
  |     infoOut("Begin Field Read Test");
  |     
  |     try
  |     {
  |       Field f = TestObject.class.getDeclaredField("testField");
  |       f.setAccessible(true);
  |       System.out.println(String.valueOf(f.get(test)));
  |       infoOut("End Field Read Test - Success")
  | ;    }
  |     catch(Exception e)
  |     {
  |       out(e);
  |       infoOut("End Field Read Test - FAILED");
  |     }
  |   }
  |   
  |   private static void infoOut(String s)
  |   {
  |     System.out.println("[" + s + "]");
  |   }
  |   
  |   private static void out(Object o)
  |   {
  |     System.out.println(o.toString());
  |   }
  | }
  | 

jboss-aop.xml

  | <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
  | <aop>
  |    <aspect name="ReflectionAspect" class="org.jboss.aop.reflection.ReflectionAspect" scope="PER_VM"/>
  | 
  |    <bind pointcut="call(* java.lang.reflect.Field->get*(..))">
  |       <advice name="interceptFieldGet" aspect="ReflectionAspect"/>
  |    </bind>
  |    
  |    <bind pointcut="call(* java.lang.reflect.Field->set*(..))">
  |       <advice name="interceptFieldSet" aspect="ReflectionAspect"/>
  |    </bind>
  | 
  |   <aspect class="test.TestAspect" scope="PER_VM"/>
  | 
  |   <bind pointcut="field(* test.TestObject->*)">
  |     <advice name="accessField" aspect="test.TestAspect"/>
  |   </bind>
  | </aop>
  | 

Am I doing something wrong, or is this a bug?

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