ssh整合报错，出现了空指针

问题描述

ssh整合报错，出现了空指针

18-Feb-2016 23:52:29.943 INFO [RMI TCP Connection(3)-127.0.0.1] org.apache.struts2.config.AbstractBeanSelectionProvider.info Choosing bean (struts) for (org.apache.struts2.dispatcher.DispatcherErrorHandler)
18-Feb-2016 23:52:43.055 SEVERE [http-apr-8080-exec-2] org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler.error Exception occurred during processing request: null
java.lang.NullPointerException
at cn.itcast.action.EmployeeAction.execute(EmployeeAction.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

报错的位置

            <!-- action实例交给spring容器创建 -->
            <action name="show" class="cn.itcast.action.EmployeeAction" method="execute">
                    <result name="SUCCESS">/index.jsp</result>
            </action>

    </package>

解决方案

cn.itcast.action.EmployeeAction的show方法的参数怎么写的，或者获取getParameter等参数没有获取到，调试下。

解决方案二：

at cn.itcast.action.EmployeeAction.execute(EmployeeAction.java:24)
24行是什么，，

解决方案三：

你把EmployeeAction 这个类贴出来看下，这个类的24行报错

解决方案四：

检查下EmployeeAction.java:24这个地方，有没有使用什么对象，调试下这些对象为什么为空？
空指针问题其实是很好定位和排查的，祝好！

时间： 2024-10-03 20:20:56

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