检查运行时的Xerces jar版本与编译时类的版本。确保在运行时有一个Xerces2 jar。我怀疑rt.jar中的类与您的应用程序正在寻找的类相同。

Check the version of your Xerces jar for your runtime versus you compile time classes. Make sure have a Xerces2 jar at runtime. I doubt the the class in the rt.jar is the same class your application is looking for.