Question

Getting following exception in Jboss 5.0 EAP but it work fine in JBoss 5.1 GA.

we are using POI 3.7 and jars included are

• poi-3.7.jar
• poi-ooxml-schemas.jar
• poi-ooxml.jar

The stack trace is

ERROR [org.apache.catalina.core.ContainerBase.[jboss.ueb].[localhost].[fesbcon-Fig].[Faces Servlet]]
    3;13;44.4g3pM (http-0.0.0.0-8280-1) Servlet.service() -For servlet Faces Servlet threu exception
    java.lang.NoClassDe-FFoundError: Could not initialize class org.apache.poi.POIXMLDocument
    at org.apache.poi.ss.usermodel.HorkbookFactory.create(HorkbookFactory.java:62)
    at com.-Ferguson.esb.con-Fig.controller.AssociationsExcelUploadController.submit(Unknoun Source)
    at sun.re-Flect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.re-Flect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.re-Flect.DelegatingMethodAccessorImpl.invoke(Delegating?ethodAccessorImpl.java:25)
    at java.lang.re-Flect.Method.invoke(Method.java:597)
    at org.apache.my-Faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:132)
    at org.apache.my-Faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:61)

Please Advise how to solve this issue in JBoss 5.0 EAP

Answer 1

It looks like you’re application is throwing the exception you’re seeing because an Apache XMLBeans JAR or class is not present when running under JBoss 5.0. It seems Apache POI is trying to load the class org.apache.xmlbeans.XMLOptions but it cannot find this class.

The message Could not initialize class SomeClass indicates that the JVM has twice tried and failed to load and statically initialize the class SomeClass. In this case, the class in question is org.apache.poi.POIXMLDocument.

Static initialization for a class consists of statically initializing its superclass, assigning values to all static fields and running all static initializer blocks. The POIXMLDocument class has a few static String constants, which won’t cause any problem, but no static initializer. It is however a subclass of POIXMLDocumentPart, which is a subclass of Object and which has the following static initialization code:

    private static POILogger logger = POILogFactory.getLogger(POIXMLDocumentPart.class);

    public static final XmlOptions DEFAULT_XML_OPTIONS;
    static {
        DEFAULT_XML_OPTIONS = new XmlOptions();
        DEFAULT_XML_OPTIONS.setSaveOuter();
        DEFAULT_XML_OPTIONS.setUseDefaultNamespace();
        DEFAULT_XML_OPTIONS.setSaveAggressiveNamespaces();
    }

This static initialization will fail if the JVM cannot load all of the POILogger, POILogFactory and XmlOptions classes.

The POILogger and POILogFactory classes are both imported from the package org.apache.poi.util.POILogFactory, and both classes are contained within poi-3.7.jar, so they’re not the problem here. So, by elimination, it seems the XmlOptions class, imported from org.apache.xmlbeans.XmlOptions, must be missing.

I found this XMLOptions class within xbean.jar contained within the lib folder of xmlbeans-2.6.0.zip downloadable from one of the mirrors here.

It seems likely to me that adding this JAR will fix the problem on JBoss 5.0 EAP. However, I’m aware you said your application works fine in JBoss 5.1 GA, which implies to me that JBoss 5.1 GA contains a copy of this JAR whereas 5.0 EAP doesn’t. As a result I’m not sure what the best way to fix this problem is. I’d be hesitant to add this XMLBeans JAR to your application as doing so may cause issues when you run it under JBoss 5.1. I don’t know whether there’s a way of adding extra ‘library’ JARs to JBoss 5.0, though – perhaps that’s worth looking at?