GAE/J+Gson Production環境でjava.lang.VerifyError: Cannot inherit from final class

ローカル環境では発生しないけど、なぜかProduction環境でのみ発生するエラー。

SDKやGsonのバージョンを最新版にしてみたり、

GSonをソースからビルドしてみたり、

何度かデプロイしてみたりしたけど、

やっぱだめ。

バージョンは、

App Engine SDK 1.7.0

gson 2.2.1

Slim3 1.0.15

未解決です。

とりあえずgsonはあきらめてJSONICにしてみよう。

Error for /aaa/save
java.lang.VerifyError: Cannot inherit from final class
    at com.google.appengine.runtime.Request.process-b316dd34b066ecd1(Request.java)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
    at sun.reflect.GeneratedMethodAccessor5.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    at com.xxx.yyy.controller.JsonController.handleError(JsonController.java:76)
    at org.slim3.controller.Controller.runBare(Controller.java:124)
    at org.slim3.controller.FrontController.processController(FrontController.java:491)
    at org.slim3.controller.FrontController.doFilter(FrontController.java:277)
    at org.slim3.controller.FrontController.doFilter(FrontController.java:237)
    at org.slim3.controller.FrontController.doFilter(FrontController.java:199)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.slim3.datastore.DatastoreFilter.doFilter(DatastoreFilter.java:55)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.slim3.controller.HotReloadingFilter.doFilter(HotReloadingFilter.java:192)
    at org.slim3.controller.HotReloadingFilter.doFilter(HotReloadingFilter.java:157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:695)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453)
    at java.lang.Thread.run(Thread.java:679)