用ant编译出现的问题

[icerain3]

我用ant进行编译时，出现下列问题，哪位大侠帮我看看。。。

Buildfile: E:\xxx\build.xml
Overriding previous definition of reference to ant.projectHelper

BUILD FAILED
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at oracle.jdevimpl.ant.runner.AntLauncher.launch(AntLauncher.java:308)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at oracle.jdevimpl.ant.runner.InProcessAntStarter.runAnt(InProcessAntStarter.java:295)
at oracle.jdevimpl.ant.runner.InProcessAntStarter.mav$runAnt(InProcessAntStarter.java:43)
at oracle.jdevimpl.ant.runner.InProcessAntStarter$1.run(InProcessAntStarter.java:71)
Caused by: java.lang.NoSuchMethodError: javax.xml.parsers.SAXParserFactory.getSchema()Ljavax/xml/validation/Schema;
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.<init>(SAXParserImpl.java:124)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl.newSAXParser(SAXParserFactoryImpl.java:98)
at org.apache.tools.ant.util.JAXPUtils.newSAXParser(JAXPUtils.java:205)
at org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.java:163)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:193)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:140)
at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:91)
... 12 more

Total time: 0 seconds

[FairLu]

Caused by: java.lang.NoSuchMethodError: javax.xml.parsers.SAXParserFactory.getSchema()Ljavax/xml/validation/Schema;
应该是用的类不对，请检查你的CLASSPATH
ClassFinder应该可以帮到你：http://www.xigole.com/software/classfinder.jsp。