还是我，求解决。求救。啊新手求救。

Question

java.lang.NullPointerException
com.action.LoginAction.execute(LoginAction.java:76)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter

Answer 1

java.lang.NullPointerException
 com.action.LoginAction.execute(LoginAction.java:76)
 不是都报异常了嘛，lz不看嘛，去LoginAction这个类的第76行看看 

Answer 2

空指针阿
     哪个对象里面的值 是null吧

Answer 3

package com.action;import com.opensymphony.xwork2.Action;public class LoginAction implements Action {
/**
 * 用户名
 */
public String username;
/**
 * 密码
 */
public String password;
/**
 * 业务逻辑封装类
 */
public LoginCompare loc;
/**
 * EL表达式传递的字符串
 */
private String message;
    /**
     * 返回Jsp页面的消息
     */
public String getMessage() {
return message;
} public void setMessage(String message) {
this.message = message;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} public LoginCompare getLoc() {
return loc;
} public void setLoc(LoginCompare loc) {
this.loc = loc;
} /*
 * 判断登录是否成功 成功返回success 失败返回error
 */
public String execute() throws Exception {
/**
 * 校验帐号密码 不能为空
 */
if (username == null || username.length() == 0) {
this.setMessage("用户名不能为空");
return INPUT;
}
if (password == null || password.length() == 0) {
this.setMessage("密码不能为空");
return INPUT;
}
/**
 * 传递用户名字符串到 EL表达式
 */
this.setMessage(username);
（这是第73行） if (loc.logcom(username, password))
return SUCCESS;
return ERROR;
}}

Answer 4

大哥我们struts、Hibernate、spring一起用的。
求解释啊

Answer 5

if (loc.logcom(username, password))

Answer 6

报错的是73行吗？76行没内容啊。如果是73行的话你们那个loc是通过spring注入进action的还是自动装配的啊？如果是通过spring注入进去的话你看spring配置文件里面写了那个配置了没。

Answer 7

com.action.LoginAction.execute(LoginAction.java:76)        这个是不会错的， 快贴76行代码。    

Answer 8

你那个loc肯定没有注入  鉴定完毕 ，  你在75行  system out 一下 loc 会打印出null

Answer 9

注入的
配置是不是这个啊？
<!-- 把struts的LoginAction交给spring -->
<bean id="log" class="com.action.LoginAction">
<property name="loc" ref="logincom"></property>
</bean>

Answer 10

if (loc.logcom(username, password))这就是76行

Answer 11

lz  你在if (loc.logcom(username, password)) 行上面加一行 System.out.println(loc);  看打印出什么鬼东西没

Answer 12

com.action.LoginCompare.logcom(LoginCompare.java:29)
 你想要的是这个吗？

Answer 13

那你struts.xml里面LoginAction对应的name是log不？还有就是那个ref="logincom"里面的logincom和spring里面的service对应的bean的id是一样不？

Answer 14

那你struts.xml里面LoginAction对应的name是log不？还有就是那个ref="logincom"里面的logincom和spring里面的service对应的bean的id是一样不？

Answer 15

struts的<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.objectFactory" value="spring" />
<package name="example" extends="struts-default">
<action name="login" class="log">
<result name="success">/success.jsp</result>
<result name="error">/error.jsp</result>
<result name="input">/index.jsp</result>
</action>
</package>
</struts>    spring的<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation"
value="classpath:hibernate.cfg.xml">
</property>
</bean>
<bean id="UsertextDAO" class="com.dao.UsertextDAO">
<property name="sessionFactory">
<ref bean="sessionFactory" />
</property>
</bean>
<bean id="logincom" class="com.action.LoginCompare">
<property name="dao" ref="UsertextDAO">
</property>
</bean>
<!-- 把struts的LoginAction交给spring -->
<bean id="log" class="com.action.LoginAction">
<property name="loc" ref="logincom"></property>
</bean>
</beans>

Answer 16

<action name="login" class="log">
明显有问题啊。。