NPE in HotswapAgent if private static enum is used.

[mkamalov]

Hi,

I have private static enum in my code. When I change outer class my code starts fail with NPE on enum.values() method in runtime.

I used 1.1.0-SNAPSHOT and 1.3.1-SNAPSHOT - both fail with the same way.

In console I have following exception:
HOTSWAP AGENT: 07:45:42.670 ERROR (org.hotswap.agent.plugin.jvm.ClassInitPlugin) - Patching __ha_clinit method failed.
java.lang.NullPointerException
at org.hotswap.agent.plugin.jvm.ClassInitPlugin.checkOldEnumValues(ClassInitPlugin.java:130)
at org.hotswap.agent.plugin.jvm.ClassInitPlugin.access$100(ClassInitPlugin.java:31)
at org.hotswap.agent.plugin.jvm.ClassInitPlugin$1.edit(ClassInitPlugin.java:84)
at org.hotswap.agent.javassist.expr.ExprEditor.loopBody(ExprEditor.java:198)
at org.hotswap.agent.javassist.expr.ExprEditor.doit(ExprEditor.java:91)
at org.hotswap.agent.javassist.CtBehavior.instrument(CtBehavior.java:712)
at org.hotswap.agent.plugin.jvm.ClassInitPlugin.patch(ClassInitPlugin.java:66)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.hotswap.agent.annotation.handler.PluginClassFileTransformer.transform(PluginClassFileTransformer.java:193)
at org.hotswap.agent.annotation.handler.PluginClassFileTransformer.transform(PluginClassFileTransformer.java:89)
at org.hotswap.agent.util.HotswapTransformer.transform(HotswapTransformer.java:184)
at sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:428)