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gfx/javassist-report.md

Last active August 29, 2015 14:00
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javassist-report.md

I'm trying to modify some code in static initializer with m.replace("$_ = ($r)false;"), but I got NPE:

Caused by: java.lang.NullPointerException
	at javassist.bytecode.ConstPool.getMethodrefNameAndType(ConstPool.java:418)
	at javassist.expr.MethodCall.getNameAndType(MethodCall.java:43)
	at javassist.expr.MethodCall.getMethodName(MethodCall.java:107)
	at com.github.gfx.javassistexamp.JavassistExample$2.edit(JavassistExample.groovy:29)
	at javassist.expr.ExprEditor.loopBody(ExprEditor.java:192)
	at javassist.expr.ExprEditor.doit(ExprEditor.java:91)
	at javassist.CtBehavior.instrument(CtBehavior.java:712)
	at javassist.CtBehavior$instrument.call(Unknown Source)

I guess it is because the static initializer has no method name, but ClassPool expects a method (behavior) should have a name.

ref. https://github.com/jboss-javassist/javassist/blob/master/src/main/javassist/bytecode/ConstPool.java#L418

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