求助：HTTP Status 500错误

Question

HTTP Status 500 -type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: Servlet.init() for servlet action threw exception
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Thread.java:595)
root cause java.lang.NullPointerException
org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:1003)
org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:955)
org.apache.struts.action.ActionServlet.init(ActionServlet.java:482)
javax.servlet.GenericServlet.init(GenericServlet.java:211)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Thread.java:595)

Answer 1

没看出来什么毛病，
但是作为空指针异常就是说有个对象没有赋值或者指向，你可以在访问的那个servlet中打印一段输出。一行行的找到空指针吧

Answer 2

Servlet.init() for servlet action threw exception
servlet初始化方法出错了，那么你看看自己的配置文件是否错误，如果没有错误照楼上所说，java类中调试错误。例如在构造方法里打印一句话，看看是否成功初始化。没有构造函数就自己写一个无参的。