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请告诉我为什么在 Jboss AS7 中部署时会出现以下错误。部署 .ear 时抛出此错误，我使用了模块。但是，当我使用 lib 中的库部署 ear 时，它的部署没有任何错误。

Caused by: java.lang.IllegalAccessError: tried to access class org.apache.xerces.parsers.ObjectFactory from class org.apache.xerces.parsers.SAXParser
    at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) [xercesImpl-2.8.1.jar:]
    at org.apache.xerces.parsers.SAXParser.<init>(Unknown Source) [xercesImpl-2.8.1.jar:]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [rt.jar:1.6.0_38]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) [rt.jar:1.6.0_38]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) [rt.jar:1.6.0_38]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) [rt.jar:1.6.0_38]
    at java.lang.Class.newInstance0(Class.java:355) [rt.jar:1.6.0_38]
    at java.lang.Class.newInstance(Class.java:308) [rt.jar:1.6.0_38]
    at org.xml.sax.helpers.NewInstance.newInstance(NewInstance.java:51) [rt.jar:1.6.0_38]
    at org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:187) [rt.jar:1.6.0_38]
    at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:180) [rt.jar:1.6.0_38]
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