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Home » Language IDEs » AJDT » [BUG?] java.lang.VerifyError with @AspectJ annotation (but with print, works!?)
[BUG?] java.lang.VerifyError with @AspectJ annotation (but with print, works!?) [message #600618] Mon, 31 August 2009 07:54
Arlindo is currently offline ArlindoFriend
Messages: 33
Registered: August 2009
Member
Hi,
I'm using Eclipse 3.4.1, AspectJ 1.6.5 and AJDT 2.0.0.

I've created a very simple test scenario that utilizes @AspectJ. When
running a main method in a class or when running a Junit test, I get the
following error:


Exception in thread "main" java.lang.VerifyError: (class: figures/Line,
method: move_aroundBody3$advice signature:
(Lfigures/Line;Lfigures/Point;IILorg/aspectj/lang/JoinPoint; Lanswers/Answer2h;Lorg/aspectj/lang/ProceedingJoinPoint;Lfig ures/FigureElement;II)V)
Incompatible argument to function
at MainTest.main(MainTest.java:24)

Here's the aspect that is causing the error
============================================================ ===
Answer2h.java
============================================================ ===
package answers;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import figures.*;
import java.awt.Rectangle;

@Aspect
public class Answer2h {
@Pointcut("call(public void figures.FigureElement+.move(int, int))"
+"&& target(fe) && args(dx, dy)")
void movingFigureElement(FigureElement fe, int dx, int dy) {}

@Around("movingFigureElement(fe, dx, dy)")
public void checkIfBoundsMovedSame(ProceedingJoinPoint thisJoinPoint,
FigureElement fe, int dx, int dy) throws Throwable {
Rectangle rectangleBefore = new Rectangle(fe.getBounds());
thisJoinPoint.proceed(new Object[]{fe, dx, dy});
rectangleBefore.translate(dx, dy);
if(!rectangleBefore.equals(fe.getBounds()))
throw new IllegalStateException("move() invariant violation");
}
}
============================================================ ===

However, strangely, when I had the following 3 lines to my aspect (I was
just doing debug), everything works normally:

for(Object o: thisJoinPoint.getArgs()) {
System.out.print(o+" ");
}

============================================================ ===
Answer2h.java (with 3 more lines)
============================================================ ===
package answers;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import figures.*;
import java.awt.Rectangle;

@Aspect
public class Answer2h {
@Pointcut("call(public void figures.FigureElement+.move(int, int))"
+"&& target(fe) && args(dx, dy)")
void movingFigureElement(FigureElement fe, int dx, int dy) {}

@Around("movingFigureElement(fe, dx, dy)")
public void checkIfBoundsMovedSame(ProceedingJoinPoint thisJoinPoint,
FigureElement fe, int dx, int dy) throws Throwable {
Rectangle rectangleBefore = new Rectangle(fe.getBounds());

for(Object o: thisJoinPoint.getArgs()) {
System.out.print(o+" ");
}

thisJoinPoint.proceed(new Object[]{fe, dx, dy});
rectangleBefore.translate(dx, dy);
if(!rectangleBefore.equals(fe.getBounds()))
throw new IllegalStateException("move() invariant violation");
}
}
============================================================ ===

????
If I use any other print (and comment the privous print), the code
continues giving the same error...
Examples (that don't work):
// System.out.println("ENTERED");
// System.out.println("Kind: "+thisJoinPoint.getKind());
// System.out.println("Signature: "+thisJoinPoint.getSignature());
// System.out.println("This: "+thisJoinPoint.getThis());
// System.out.println("Target: "+thisJoinPoint.getTarget());

Another interesting thing (that makes me believe it's some kind of bug).
The Answer2h.java is equivalent to this one:
============================================================ ===
Answer2h.aj
============================================================ ===
package answers;

import figures.*;
import java.awt.Rectangle;

public aspect Answer2h {
pointcut movingFigureElement(FigureElement figureElement, int dx, int dy):
call(public void figures.FigureElement+.move(int, int)) &&
target(figureElement) &&
args(dx, dy);

void around(FigureElement figureElement, int dx, int dy):
movingFigureElement(figureElement, dx, dy) {
Rectangle rectangleBefore =
new Rectangle(figureElement.getBounds());
proceed(figureElement, dx, dy);
rectangleBefore.translate(dx, dy);
if(!rectangleBefore.equals(figureElement.getBounds()))
throw new IllegalStateException("move() invariant violation"); }
}
============================================================ ===
But this latter works!!
Can anyone tell me how to fix this?
Thanks.
Here's the MainTest.java code (not sure if it helps):
============================================================ ===
MainTest.java
============================================================ ===
import figures.Box;
import figures.FigureElement;
import figures.Group;
import figures.Line;
import figures.Point;
import figures.SlothfulPoint;


public class MainTest {

/**
* @param args
*/
public static void main(String[] args) {
Box bb;
Point p1;
Point p2;
Line l1;
SlothfulPoint sloth1;
Group g;

p1 = new Point(10, 100);
p2 = new Point(20, 200);
l1 = new Line(p1, p2); // line of the error
bb = new Box(5, 5, 10, 10);
sloth1 = new SlothfulPoint(0, 0);
g = new Group(p1);

FigureElement fe = new SlothfulPoint(10, 10);
try {
fe.move(10, 10);
System.out.println("should have thrown IllegalStateException");
} catch (IllegalStateException e) { e.printStackTrace(); }

p1.move(30, 45);
p2.move(10, 33);
}

}
============================================================ ===

P.S.:

When I use the MainTest.java to lauch the example, inside Answer2h.java I
have to use this call to proceed:

thisJoinPoint.proceed(new Object[]{fe, dx, dy});

But, when I use the JUnit, the test oly runs if I use :

thisJoinPoint.proceed(new Object[]{fe, fe, dx, dy});

Why? Shouldn't the call be the same? And shouldn't the latter be the
correct one ({target + 3 parameters})?

Regards.
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