使用Wscompile时总是出现错误提示.
命令为：wscompile -define -mapping build/mappin.xml -d build -nd bu
ild -classpath build config-interface.xml
错误提示为：
Exception in thread "main" javax.xml.parsers.FactoryConfigurationError: java.lan
g.ClassNotFoundException: com/sun/org/apache/xerces/internal/jaxp/DocumentBuilde
rFactoryImpl
        at javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderF
actory.java:118)
        at com.sun.xml.rpc.processor.generator.JaxRpcMappingGenerator.newDocumen
t(JaxRpcMappingGenerator.java:78)
        at com.sun.xml.rpc.processor.generator.JaxRpcMappingGenerator.buildMappi
ng(JaxRpcMappingGenerator.java:55)
        at com.sun.xml.rpc.processor.generator.JaxRpcMappingGenerator.perform(Ja
xRpcMappingGenerator.java:48)
        at com.sun.xml.rpc.processor.Processor.runActions(Processor.java:88)
        at com.sun.xml.rpc.tools.wscompile.CompileTool.run(CompileTool.java:739)

        at com.sun.xml.rpc.util.ToolBase.run(ToolBase.java:43)
        at com.sun.xml.rpc.tools.wscompile.Main.main(Main.java:22)

在classpath中已经设置了相关类，请高手帮忙分析原因。
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