Hello!

I wrote a class that removes final modifier from given classes, here's the most relevant method:

public void instrument(CtClass clazz) {

 int modifiers = clazz.getModifiers();

 if (Modifier.isFinal(modifiers)) {
 logger.info("Will remove final modifier from class: " + clazz.getName());
 logger.debug("Old modifiers: " + Modifier.toString(modifiers));

 int newModifiers = Modifier.clear(modifiers, Modifier.FINAL);
 logger.debug("New modifiers: " + Modifier.toString(newModifiers));

 clazz.setModifiers(newModifiers);

 } else {
 logger.debug("Class is not final, nothing do change: " + clazz.getName());
 }
 }

Running my util on the JDK classes results in an exception:

Exception in thread "main" java.lang.RuntimeException: cannot set to static
 at javassist.CtClassType.setModifiers(CtClassType.java:374)

The last lines of my log are:

307 [ main] TRACE mon.javassist.FileInstrumenter - Current jar entry: com/sun/corba/se/impl/corba/AnyImpl$AnyInputStream.class
307 [ main] INFO y.framework.utils.FinalRemover - Will remove final modifier from class: com.sun.corba.se.impl.corba.AnyImpl$AnyInputStream
308 [ main] DEBUG y.framework.utils.FinalRemover - Old modifiers: static final
308 [ main] DEBUG y.framework.utils.FinalRemover - New modifiers: static

The class CtClassType contains the following lines:

public void setModifiers(int mod) {
 if (Modifier.isStatic(mod))
 throw new RuntimeException("cannot set to static");

 checkModify();
 int acc = AccessFlag.of(mod) | AccessFlag.SUPER;
 getClassFile2().setAccessFlags(acc);
 }

So, why is it not possible to change the modifier from "static final" to "static"? AFAIK, static inner classes are allowed, aren't they?

Regards, Martin