Initializing Hibernate with GWT problem
Pergunta
I'm trying to use Hibernate with GWT (using Gilead) but I got the following error
[WARN] /hibernate/greet
java.lang.NoClassDefFoundError: Could not initialize class net.jaffa.hibernate.server.NewHibernateUtil
at net.jaffa.hibernate.server.GreetingServiceImpl.<init>(GreetingServiceImpl.java:26)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:463)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
[ERROR] 500 - POST /hibernate/greet (127.0.0.1) 3632 bytes
Request headers
Host: 127.0.0.1:8888
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://127.0.0.1:8888/hibernate/hosted.html?hibernate
X-GWT-Permutation: HostedMode
X-GWT-Module-Base: http://127.0.0.1:8888/hibernate/
Content-Type: text/x-gwt-rpc; charset=utf-8
Content-Length: 175
Pragma: no-cache
Cache-Control: no-cache
Response headers
Content-Type: text/html; charset=iso-8859-1
Content-Length: 3632
This is still a new project, just I'm trying to do proof of concept.
Thanks Feras
Solução
java.lang.NoClassDefFoundError: Could not initialize class n.j.h.s.NewHibernateUtil
This error means that the class is found but its initialization failed. Possible causes include
- some dependencies are unsatisfied ~or~
- an exception is thrown when executing a static initialization block in the class.
In the particular case of a typical HibernateUtil
class, I'd bet on the second option. Extract the code of the static initialization block and run it / debug it in a regular main
, outside the container (and maybe try to improve the error reporting in case of problem).
Outras dicas
java.lang.NoClassDefFoundError means the runtime could not locate the class in its classpath. It seems you are missing a jar which contains the class net.jaffa.hibernate.server.NewHibernateUtil .