weblogic 启动报错 java.lang.LinkageError: loader constraint violation in interface itable initialization

Caused by: java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "org.apache.xerces.impl.xs.opti.DefaultElement.getSchemaTypeInfo()Lorg/w3c/dom/TypeInfo;" the class loader (instance of weblogic/utils/classloaders/ChangeAwareClassLoader) of the current class, org/apache/xerces/impl/xs/opti/DefaultElement, and the class loader (instance of <bootloader>) for interface org/w3c/dom/Element have different Class objects for the type org/w3c/dom/TypeInfo used in the signature
at org.apache.xerces.impl.xs.opti.SchemaDOM.reset(Unknown Source)
at org.apache.xerces.impl.xs.opti.SchemaDOM.<init>(Unknown Source)
at org.apache.xerces.impl.xs.opti.SchemaDOMParser.startDocument(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown Source)
at org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown Source)

原因：jar包冲突，我的程序中依赖xercesImpl-2.9.1.jar，weblogic也有相应的包，去掉我自己的包就行啦。

在weblogic.xml中，配置prefer-web-inf-classes 为true，表示优先加载，程序中的jar包。weblogic还会加载它自己的，所以就冲突了，将这个值改成false，也行，不用删除程序中的jar，weblogic也能起来，但是log4j也是用的weblogic的了，自己配置log4j配置文件就不管用了。

<container-descriptor> 
<prefer-web-inf-classes>true</prefer-web-inf-classes> 

</container-descriptor>