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Problem with J2EE Application Server

From: <glassfish_at_javadesktop.org>
Date: Thu, 16 Oct 2008 03:10:57 PDT

Hi, I have created a very simple web application: myapplication.war.
I have deployed it in Tomcat and it works! Then i have deployed it in J2EE Application Server, but i have such situation: I can open the HTML page where there is a form which sends values to a Servlet, but when i push on submit i get this error...

javax.servlet.ServletException: Error allocating a servlet instance
        org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:189)
        com.sun.enterprise.web.connector.grizzly.ProcessorTask.doProcess(ProcessorTask.java:604)
        com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:475)
        com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:371)
        com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:264)
        com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:281)



may you help me please? I don't understand why on Tomcat it works and on J2EE AS it doesn't work...i have deployed the same .war file in both the servers...
Thanks!
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