web service wsdl2java

Hi, I am new to soap web service. I need build java classes from an existing wsdl file. I right click the wsdl file, ->Web Service -> Generate java bean skeleton. then I got some error:

Loading FrontEnd jaxws ...
Loading DataBinding jaxb ...
wsdl2java -d C:\Users\workspaceTest\SQueryWebService\.cxftmp/src -classdir C:\Users\workspaceTest\SQueryWebService\build\classes -p http://netg.z.com/WS/SQueryWS/=com.z.netg.ws.squeryws -impl -validate -exsh false -dns true -dex true -wsdlLocation file:/C:/Users/workspaceTest/SQueryWebService/WebContent/wsdl/SQueryWS.wsdl -verbose -defaultValues -fe jaxws -db jaxb -wv 1.1 file:/C:/Users/workspaceTest/SQueryWebService/WebContent/wsdl/SQueryWS.wsdl
wsdl2java - Apache CXF 3.1.11


WSDLToJava Error: java.lang.NullPointerException

org.apache.cxf.tools.common.ToolException: java.lang.NullPointerException
	at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:424)
	at org.apache.cxf.tools.common.toolspec.ToolRunner.runTool(ToolRunner.java:105)
	at org.apache.cxf.tools.wsdlto.WSDLToJava.run(WSDLToJava.java:113)
	at org.apache.cxf.tools.wsdlto.WSDLToJava.run(WSDLToJava.java:86)
	at org.apache.cxf.tools.wsdlto.WSDLToJava.main(WSDLToJava.java:185)
Caused by: java.lang.NullPointerException
	at org.apache.cxf.tools.wsdlto.databinding.jaxb.JAXBDataBinding$3.resolveResource(JAXBDataBinding.java:992)
	at com.sun.org.apache.xerces.internal.util.DOMEntityResolverWrapper.resolveEntity(DOMEntityResolverWrapper.java:117)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.resolveEntity(XMLEntityManager.java:1081)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.resolveDocument(XMLSchemaLoader.java:654)
	at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.resolveSchema(XSDHandler.java:2058)
	at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.constructTrees(XSDHandler.java:1014)
	at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.constructTrees(XSDHandler.java:1126)
	at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:625)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:610)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:569)
	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:535)
	at com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema(XMLSchemaFactory.java:254)
	at javax.xml.validation.SchemaFactory.newSchema(SchemaFactory.java:638)
	at org.apache.cxf.tools.wsdlto.databinding.jaxb.JAXBDataBinding.validateSchema(JAXBDataBinding.java:1002)
	at org.apache.cxf.tools.wsdlto.databinding.jaxb.JAXBDataBinding.addSchemasForServiceInfos(JAXBDataBinding.java:728)
	at org.apache.cxf.tools.wsdlto.databinding.jaxb.JAXBDataBinding.addSchemas(JAXBDataBinding.java:711)
	at org.apache.cxf.tools.wsdlto.databinding.jaxb.JAXBDataBinding.initialize(JAXBDataBinding.java:441)
	at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.generateTypes(WSDLToJavaContainer.java:727)
	at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.processWsdl(WSDLToJavaContainer.java:271)
	at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:165)
	at org.apache.cxf.tools.wsdlto.WSDLToJavaContainer.execute(WSDLToJavaContainer.java:416)
	... 4 more

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Any help is appreciated!