Hi, I updated my app to tapestry5.2.0.0-SNAPSHOT and GAE SDK 1.2.6 and had errors like:
* java.lang.VerifyError Stack size too large * java.lang.ClassFormatError: Invalid length 65050 in LocalVariableTable in class file org/apache/tapestry5/corelib/components/Form The first error seemed to be caused by ANTLR grammar (see https://issues.apache.org/jira/browse/TAP5-913 with patch) And the other one is with GAE SDK Javaagent. I had to turn it off to avoid the issues. I wrote a blog entry with details how to turn it off: http://dmitrygusev.blogspot.com/2009/10/develope-java-applications-with-gae-sdk.html HTH -- Dmitry Gusev AnjLab Team http://anjlab.com