error popping up while dynamicly change Java class generated from google protobuffer

[mimipig]

I have some Java files generated from google protobuffer file. These java files are very complicated with deep embedded inner class. While I modify the protobuffer file(ie, add one field) and regenerate these java files, spring-loaded can't reload these classes. With error like this popping up:

Exception in thread "main" java.lang.IllegalAccessError: tried to access method com.google.protobuf.GeneratedMessage$Builder.onChanged()V from class com.alibaba.solar.halley.protobuf.CustomerProtos$Customer$Builder$$EPGg1bMu
at com.alibaba.solar.halley.protobuf.CustomerProtos$Customer$Builder$$EPGg1bMu.setId(CustomerProtos.java:1121)
at com.alibaba.solar.halley.protobuf.CustomerProtos$Customer$Builder$$DPGg1bMu.setId(Unknown Source)
at com.alibaba.solar.halley.protobuf.CustomerProtos$Customer$Builder.setId(CustomerProtos.java)
at com.alibaba.solar.halley.classloader.CustomerProtosTest.main(CustomerProtosTest.java:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1270)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)