Beginner in trouble with a simple gwt/hibernate test.

[jog...@gmail.com]

I generated cfg, mappings and dao classes with hibernateSync, and on
the _RootDAO.initialize(); in a simple server class (with only this
last line :) ) I got the following error stack :

2007-05-09 13:59:29 StandardContext[/AbleFramework]Exception while
dispatching incoming RPC call
java.lang.UnsupportedClassVersionError: Bad version number in .class
file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:
1634)
at
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:
860)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:
1307)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:
1189)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at
org.hibernate.connection.DriverManagerConnectionProvider.configure(DriverManagerConnectionProvider.java:
57)
at
org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:
124)
at
org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:
56)
at
org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:
410)
at
org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:
62)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:
2009)
at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:
1292)
at
com.able.framework.server.dal.base._BaseRootDAO.initialize(_BaseRootDAO.java:
103)
at
com.able.framework.server.dal.base._BaseRootDAO.initialize(_BaseRootDAO.java:
90)
at
com.able.framework.server.dal.base._BaseRootDAO.initialize(_BaseRootDAO.java:
81)
at
com.able.framework.server.AbleServiceImpl.test(AbleServiceImpl.java:
20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
281)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:
167)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

As I have no xp using both technologies together, i am kindly asking
for you help :) Any clue, entry point to debug, will be accepted as I
have really no idea of what is happening there !

Thank you !!

[Jason Essington]

your clue is the first line of the stack trace:

java.lang.UnsupportedClassVersionError: Bad version number in .class

This type of error is usually caused by trying to run code compiled
using one JVM version (perhaps 1.5 or 1.6)
on an unsupported (usually older) JVM (maybe 1.4 or 1.3)

-jason