紧急求教：我运行结果怎么出现下提示，

[szbobos]

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error allocating a servlet instance
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
java.lang.Thread.run(Unknown Source)


root cause

java.lang.NoClassDefFoundError: test/ServletTest (wrong name: ServletTest/ServletTest)
java.lang.ClassLoader.defineClass0(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1677)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:900)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1350)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
java.lang.Thread.run(Unknown Source)


note The full stack trace of the root cause is available in the Tomcat logs.