整合ssh使用hibernateTemplate的find方法报空指针？
这是entity类
- Java code
package com.tjw.mysql.model;import javax.annotation.Generated;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import org.springframework.stereotype.Component;@Component("admin")@Entitypublic class Admin { private int id ; private String name ; private String password ; private int grade ; @Id public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getGrade() { return grade; } public void setGrade(int grade) { this.grade = grade; }}这是实现类
- Java code
package com.tjw.mysql.dao.impl;import java.io.Serializable;import java.util.HashSet;import java.util.List;import java.util.Set;import javax.annotation.Resource;import javax.jms.Session;import org.hibernate.Query;import org.springframework.orm.hibernate3.HibernateTemplate;import org.springframework.stereotype.Component;import com.tjw.mysql.dao.AdminDAO;import com.tjw.mysql.model.Admin;@Component("adminDAO")public class AdminImpl implements AdminDAO{ private HibernateTemplate hibernateTemplate; public void doCreate(Admin admin) { // TODO Auto-generated method stub hibernateTemplate.save(admin); } public boolean doCreateOrdoUpdate(Admin admin) { // TODO Auto-generated method stub return false; } public void doDelete(Admin admin) { this.hibernateTemplate.delete(admin); } public void doUpdate(Admin admin) { // TODO Auto-generated method stub this.hibernateTemplate.update(admin); } public List<Admin> findAll(){ // TODO Auto-generated method stub List<Admin> list = (List<Admin>)this. hibernateTemplate.find("from Admin"); return list ; } public Admin findById(int id) { // TODO Auto-generated method stub return null; } public int getCount() { // TODO Auto-generated method stub return 0; } public HibernateTemplate getHibernateTemplate() { return hibernateTemplate; } @Resource public void setHibernateTemplate(HibernateTemplate hibernateTemplate) { this.hibernateTemplate = hibernateTemplate; }}这是配置文件
- Java code
<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> <context:annotation-config /> <context:component-scan base-package="com.tjw.mysql.model" /> <context:component-scan base-package="com.tjw.mysql.service" /> <context:component-scan base-package="com.tjw.mysql.dao.impl" /> <!-- <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/spring" /> <property name="username" value="root" /> <property name="password" value="bjsxt" /> </bean> --> <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <value>classpath:jdbc.properties</value> </property> </bean> <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- <property name="annotatedClasses"> <list> <value>com.bjsxt.model.User</value> <value>com.bjsxt.model.Log</value> </list> </property> 下面是为了表明哪些是被entity注解标识的 --> <property name="packagesToScan"> <list> <value>com.tjw.mysql.model</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect </prop> <prop key="hibernate.show_sql">true</prop> </props> </property> </bean> <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <aop:config> <aop:pointcut id="bussinessService" expression="execution(public * com.bjsxt.service..*.*(..))" /> <aop:advisor pointcut-ref="bussinessService" advice-ref="txAdvice" /> </aop:config> <tx:advice id="txAdvice" transaction-manager="txManager"> <tx:attributes> <tx:method name="getUser" read-only="true" /> <tx:method name="add*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> <property name="sessionFactory" ref="sessionFactory"></property> </bean></beans>
简单地这样调用
AdminImpl adminImpl = new AdminImpl();
adminImpl.findAll();
报出异常
java.lang.NullPointerException
at com.tjw.mysql.dao.impl.AdminImpl.findAll(AdminImpl.java:52)
at com.tjw.mysql.model.TestAdmin.testStudent(TestAdmin.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
这是为什么呢？我在beans.xml配置文件里不是把sessionFactory和hibernateTemplate都注入了吗怎么还出现空指针的异常呢
[解决办法]
都没有获取bean，就不会执行，就不能得到了