servlet 错误 请教牛人！！！

[xiaoyetao08]

javax.servlet.ServletException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause
这错是要导包吗
我是在做登陆验证出的

[RainRainbow]

root cause怎么不贴出来?

[shine333]

就是阿，最关键的给你弄掉了

[popularsong]

这一般是jsp级的错误好好检查一下吧

[xiaoyetao08]

java.lang.NullPointerException
classmate.LoginAction.execute(LoginAction.java:42)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

[unsalted]

提示的很清楚了
LoginAction.java:42行出现了空指针异常。

[zhangj0571]

LoginAction.java 第42行的没个对象的值是null，查看源代码