Modifying jcomponent

[gordon1986]

ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.get("javax.swing.JComponent");
CtMethod m = cc.getDeclaredMethod("paint");
m.insertBefore("((java.awt.Graphics2D)$1).setRenderingHint(java.awt.RenderingHints.KEY_ANTIALIASING, java.awt.RenderingHints.VALUE_ANTIALIAS_ON);");

I am trying to modify all jcomponents so that they have antialiasing enabled when they are painted. However, this doesnt quite seem to work. I want this to be a runtime, change. I do not want to write the class to disk and then use it (as it would breach the sun license).

What am I doing wrong?

[chiba]

This problem should have been fixed in CVS_HEAD.
Please download the source files from CVS and try again.
At least, I could run the following code without any problem:

ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.get("javax.swing.JComponent");
CtMethod m = cc.getDeclaredMethod("paint");
m.insertBefore("((java.awt.Graphics2D)$1).setRenderingHint(java.awt.RenderingHints.KEY_ANTIALIASING, java.awt.RenderingHints.VALUE_ANTIALIAS_ON);");
Class c = cc.toClass(); // I added.

[gordon1986]

Well, now I get errors:

javassist.CannotCompileException: by java.lang.LinkageError: duplicate class definition: javax/swing/JLabel
 at javassist.CtClass.toClass(CtClass.java:900)
 at javassist.CtClass.toClass(CtClass.java:860)
 at AASwing.main(AASwing.java:40)
Exception in thread "main"

The exception is thrown at the Class c = cc.toClass(); line.
the code is as follows:

ClassPool pool = ClassPool.getDefault();
 CtClass cc = pool.get("javax.swing.JLabel");
 CtMethod m = cc.getSuperclass().getDeclaredMethod("paint");
 m.insertBefore("((java.awt.Graphics2D)$1).setRenderingHint(java.awt.RenderingHints.KEY_ANTIALIASING, java.awt.RenderingHints.VALUE_ANTIALIAS_ON); super.paint($1);");
 Class c = cc.toClass();

 JLabel b = (JLabel)c.newInstance();

How do I replace the JLabel component?

[chiba]

That's because the JVM had loaded JLabel
before toClass() was called. To avoid this,
maybe you should write your own class
loader to run your whole application.
For details, please take a look at the tutorial.