婴儿被家里的狗吃了:eclipse+jboss 问题

在启动jboss里出现这样的错误
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09:16:37,810 INFO [Server] Starting JBoss (MX MicroKernel)...
09:16:37,810 INFO [Server] Release ID: JBoss [Zion] 4.0.4.GA (build: CVSTag=JBoss_4_0_4_GA date=200605151000)
09:16:37,830 INFO [Server] Home Dir: C:\jboss-4.0.4.GA
09:16:37,830 INFO [Server] Home URL: file:/C:/jboss-4.0.4.GA/
09:16:37,830 INFO [Server] Patch URL: null
09:16:37,830 INFO [Server] Server Name: all
09:16:37,830 INFO [Server] Server Home Dir: C:\jboss-4.0.4.GA\server\all
09:16:37,840 INFO [Server] Server Home URL: file:/C:/jboss-4.0.4.GA/server/all/
09:16:37,840 INFO [Server] Server Log Dir: C:\jboss-4.0.4.GA\server\all\log
09:16:37,840 INFO [Server] Server Temp Dir: C:\jboss-4.0.4.GA\server\all\tmp
09:16:37,840 INFO [Server] Root Deployment Filename: jboss-service.xml
09:16:38,972 ERROR [BasicMBeanRegistry] Cannot register MBean
java.lang.NoClassDefFoundError: org/dom4j/DocumentException
at javax.management.modelmbean.ModelMBeanAttributeInfo.createDefaultDescriptor(ModelMBeanAttributeInfo.java:281)
at javax.management.modelmbean.ModelMBeanAttributeInfo.<init>(ModelMBeanAttributeInfo.java:158)
at org.jboss.mx.metadata.MBeanInfoConversion.toModelMBeanInfo(MBeanInfoConversion.java:94)
at org.jboss.mx.modelmbean.XMBean.<init>(XMBean.java:229)
at org.jboss.mx.server.registry.BasicMBeanRegistry.registerMBean(BasicMBeanRegistry.java:194)
at org.jboss.mx.server.MBeanServerImpl.<init>(MBeanServerImpl.java:215)
at org.jboss.mx.server.MBeanServerBuilderImpl.newMBeanServer(MBeanServerBuilderImpl.java:71)
at javax.management.MBeanServerFactory$2.run(MBeanServerFactory.java:241)
at java.security.AccessController.doPrivileged(Native Method)
at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFactory.java:236)
at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFactory.java:168)
at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:420)
at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362)
at org.jboss.Main.boot(Main.java:200)
at org.jboss.Main$1.run(Main.java:464)
at java.lang.Thread.run(Unknown Source)
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好心人帮我看一下是哪里配置错了，还是什么其他原因．谢谢哦~~
我是初学者，请具体说一下这种问题应如何解决，谢谢^_^