Question

Hibernate+spring+struts2+orcale

我也不知道这是什么问题

-------------------------------------------------
applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName"
value="oracle.jdbc.driver.OracleDriver">
</property>
<property name="url"
value="jdbc:oracle:thin:@192.168.1.12:1521:LBTERP">
</property>
<property name="username" value="crmdev"></property>
<property name="password" value="crmdev"></property>
</bean>

<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.Oracle9Dialect
</prop>
<prop key="hibernate.show_sql">
true
</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>com/lbt/pojo/TRole.hbm.xml</value>
<value>com/lbt/pojo/TRoleMenu.hbm.xml</value>
<value>com/lbt/pojo/TRecord.hbm.xml</value>
<value>com/lbt/pojo/TEmployee.hbm.xml</value>
<value>com/lbt/pojo/TFlow.hbm.xml</value>
<value>com/lbt/pojo/TContact.hbm.xml</value>
<value>com/lbt/pojo/TMerchant.hbm.xml</value>
<value>com/lbt/pojo/TMenu.hbm.xml</value></list>
</property>
</bean>

<bean id="temployeeDao" class="com.lbt.dao.TEmployeeDao">
<property name="sessionFactory">
<ref bean="sessionFactory"/>
</property>
</bean>

</beans>

-----------------------------
error

java.lang.NullPointerException
com.lbt.action.LoginAction.execute(LoginAction.java:49)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)

Answer 1

出现空指针异常了，看看struts2中的execute方法是不是写的有问题！问题可能发生在LoginAction这个类中。

SSH整合步骤：(看下配置是不是有问题)
1. 添加Spring 2.0的Libraries

选择以下4个jar，并配置到/WEB-INF/lib下
Spring2.0 AOP Libraries
Spring2.0 Core Libraries
Spring2.0 Persistence Core Libraries
Spring2.0 WEb Libraries
同时，将applicationContext.xml配置到WEB/INF下面。

2. 添加Hibernate 3.0的Libraries

选择以下2个jar，并配置到/WEB-INF/lib下
Hibernate 3.0 Core Libraries
hibernate 3.0 Advanced Support Libraries
同时Hibernate的文件选择合并到applicationContext.xml（即不单独创建hibernate的配置文件，而是将其作为资源文件整合到applicationContext.xml中）

3. 添加commons-pool-1.4.jar和commons-dbcp-1.2.2.jar两个jar到lib下，以消除applicationContext.xml中找不到class的的错误

4. 添加struts2的五个jar到lib下

commons-logging-1.0.4.jar
freemarker-2.3.8.jar
ognl-2.6.11.jar
xwork-2.0.5.jar
struts-core-1.3.5.jar
注意：由于要整合Spring，还需要添加struts2-spring-plugin-2.0.11.2.jar

5. 配置web.xml

5.1 配置spring的应用上下文
<!-- spring的应用上下文 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext*.xml</param-value>
</context-param>
5.2 配置struts2的过滤器

<!-- struts2 过滤器 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
5.3 配置spring的监听器，以便在启动时就自动加载spring的配置
<!-- spring的监听器，以便在启动时就自动加载spring的配置 -->
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
5.4 配置OpenSessionInViewFilter过滤器，处理事务
<!-- OpenSessionInViewFilter过滤器 -->
<filter>
<filter-name>lazyLoadingFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>lazyLoadingFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>

6. 配置struts.xml

6.1 添加一常量，将action交予Spring处理
<constant name="struts.objectFactory" value="spring"></constant>
6.2 配置action

7. 将struts.xml中的action注册到applicationContext.xml中