Ok, I found the problem. It is not specific to enumerations: Javassist doesn't
properly handle array classes.
For example, this code poses problems:
String[] theStrings = {"A", "B"};
theStrings = theStrings.clone();
The problem is that in the class file, the method call is represented like that:
16: invokevirtual #5; //Method
"[Ljava/lang/String;".clone:()Ljava/lang/Object;
So this is a call to method "clone" in class "[Ljava/lang/String;". And when
trying to retrieve the target class, MethodCall.getCtClass passes this
classname to ClassPool.get. But ClassPool.get doesn't understand this syntax:
it expects something like java.lang.String[]
So I see two ways to fix it:
- Either change MethodCall.getClassName so that it transforms
[Ljava.lang.String; to java.lang.String[]
- Change ClassPool.get() so that it accepts [Ljava.lang.String;
PS:
The reason why my original code worked with eclipse is that the eclipse
compiler doesn't produce the same bytecode for enums in the values() method:
Javac clones an array while eclipse instanciates a new array and does an
arraycopy.
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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3875208#3875208
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