运行Tomcat，首页能进入，输入帐号密码后出现如下问题：

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: Filter execution threw an exceptionroot cause java.lang.Error: Unresolved compilation problems: The import cn.gov.hnst.osta.stas.utils.SystemParameter cannot be resolved SystemParameter cannot be resolved cn.gov.hnst.osta.stas.actions.system.LoginAction.<init>(LoginAction.java:22) sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) java.lang.reflect.Constructor.newInstance(Unknown Source) java.lang.Class.newInstance0(Unknown Source) java.lang.Class.newInstance(Unknown Source) com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:119) com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150) com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:139) com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:109) com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:288) com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:388) com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:187) org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61) org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39) com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47) org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:478) org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)note The full stack trace of the root cause is available in the Apache Tomcat/6.0.24 logs.Apache Tomcat/6.0.24 怎么办啊？出现这个问题？是不是包没有导入？

Answer 1

在HTTP协议中，HTTP
Status
500
是服务器内部错误。
从错误信息中可以看到，你要连接的WEB服务器，是基于免费软件Apache
Tomcat/5.0.28
来实现的，是JAVA形式的WEB服务器。
错误的直接现象是，JSP有错。没法编译，或是某种原因环境被破坏，使的JAVA的class找不到。
根本原因，可有以下可能性：
1。网站的JSP有错。
2。在表示的页面中，你输入了系统预想之外的内容，使的系统无法对应而崩溃。
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