Spring with Hibernate - 线程中的异常“main”显示java.lang.NullPointerException [英] Spring with Hibernate - Exception in thread "main" java.lang.NullPointerException

问题描述

 线程mainjava.lang中的异常。 NullPointerException 
 Sep 04，2014 7:06:50 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 
 INFO：Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4577357d：startup date [Thu Sep 04 19:06:50 IST 2014];上下文层次结构的根
 2014年9月4日7:06:50 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 
 INFO：从类路径资源加载XML bean定义[app-context.xml ] 
 2014年9月4日7:06:51 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons 
 INFO：预先实例化org.springframework.beans.factory.support.DefaultListableBeanFactory中的单例30583b71：定义bean [dataSource，mysessionFactory，hibernateTemplate，employeeDAO];工厂层次根目录
 .19：06：52.016 [main] INFO org.hibernate.cfg.Environment  -  Hibernate 3.3.0.SP1 
 .19：06：52.023 [main] INFO org.hibernate。 cfg.Environment  - 找不到hibernate.properties 
 .19：06：52.027 [main] INFO org.hibernate.cfg.Environment  - 字节码提供程序名称：javassist 
 .19：06：52.032 [main] INFO org.hibernate.cfg.Environment  - 使用JDK 1.4 java.sql.Timestamp处理
 .19：06：52.246 [main] INFO org.hibernate.cfg.HbmBinder  - 映射类：com.bean.Employee  - > EMP1 
 2014年9月4日7:06:52 org.springframework.orm.hibernate3.LocalSessionFactoryBean buildSessionFactory 
 INFO：构建新的Hibernate SessionFactory 
 .19：06：52.320 [main] INFO ohc ConnectionProviderFactory  - 初始化连接提供者：org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider 
 .19：06：54.660 [main] INFO org.hibernate.cfg.SettingsFactory  -  RDBMS：Oracle，版本：Oracle数据库10g快速版版本10.2 .0.1.0  - 生产
 .19：06：54.660 [main] INFO org.hibernate.cfg.SettingsFactory  -  JDBC驱动程序：Oracle JDBC驱动程序，版本：10.2.0.1.0XE 
 .19：06 ：54.681 [main] INFO org.hibernate.dialect.Dialect  - 使用方言：org.hibernate.dialect.Oracle9Dialect 
 .19：06：54.683 [main] WARN org.hibernate.dialect.Oracle9Dialect  -  Oracle9Dialect方言有已被弃用;使用Oracle9iDialect或Oracle10gDialect代替
 .19：06：54.686 [main] INFO ohtTransactionFactoryFactory  - 事务策略：org.springframework.orm.hibernate3.SpringTransactionFactory 
 .19：06：54.688 [main] INFO oht TransactionManagerLookupFactory  - 没有配置TransactionManagerLookup（在JTA环境中，不推荐使用读写或事务性二级缓存）
 .19：06：54.688 [main] INFO org.hibernate.cfg.SettingsFactory  - beforeCompletion（）：已禁用
 .19：06：54.688 [main] INFO org.hibernate.cfg.SettingsFactory  - 事务结束时自动会话关闭：已禁用
 .19：06：54.688 [main] INFO org.hibernate.cfg.SettingsFactory  -  JDBC批处理大小：15 
 .19：06：54.688 [main] INFO org.hibernate.cfg.SettingsFactory  - 版本化数据的JDBC批更新：disabled 
 .19： 06：54.689 [main] INFO org.hibernate.cfg.SettingsFactory  - 可滚动结果集：启用
 .19：06：54.689 [main] INFO org .hibernate.cfg.SettingsFactory  -  JDBC3 getGeneratedKeys（）：disabled 
 .19：06：54.689 [main] INFO org.hibernate.cfg.SettingsFactory  - 连接发布模式：auto 
 .19：06：54.690 [main] INFO org.hibernate.cfg.SettingsFactory  - 默认批量获取大小：1 
 .19：06：54.690 [main] INFO org.hibernate.cfg.SettingsFactory  - 生成包含注释的SQL：disabled 
 .19：06：54.690 [main] INFO org.hibernate.cfg.SettingsFactory  - 按主键排序SQL更新：disabled 
 .19：06：54.690 [main] INFO org.hibernate.cfg.SettingsFactory  -  Order SQL inserts for batching：disabled 
 .19：06：54.690 [main] INFO org.hibernate.cfg.SettingsFactory  - 查询翻译器：org.hibernate.hql.ast.ASTQueryTranslatorFactory 
 .19：06：54.692 [ main] INFO ohhast.ASTQueryTranslatorFactory  - 使用ASTQueryTranslatorFactory 
 .19：06：54.692 [main] INFO org.hibernate.cfg.SettingsFactory  - 查询语言替换：{} 
 .19：06：54.693 [main ] INFO org.hibernate.cfg.SettingsFactory  - JPA-QL严格合规性：已禁用
 .19：06：54.693 [main] INFO org.hibernate.cfg.SettingsFactory  - 二级缓存：已启用
 .19：06：54.693 [main] INFO org .hibernate.cfg.SettingsFactory  - 查询缓存：已禁用
 .19：06：54.693 [main] INFO org.hibernate.cfg.SettingsFactory  - 缓存区工厂：org.hibernate.cache.impl.NoCachingRegionFactory 
 .19：06：54.693 [main] INFO org.hibernate.cfg.SettingsFactory  - 优化缓存的最小存储空间：disabled 
 .19：06：54.693 [main] INFO org.hibernate.cfg.SettingsFactory  -  Structured second-级别高速缓存条目：已禁用
 .19：06：54.699 [main] INFO org.hibernate.cfg.SettingsFactory  - 将所有SQL回送到stdout 
 .19：06：54.700 [main] INFO org.hibernate。 cfg.SettingsFactory  -  Statistics：disabled 
 .19：06：54.700 [main] INFO org.hibernate.cfg.SettingsFactory  - 删除的实体合成标识符rollback：disabled 
 .19：06：54.700 [main] INFO org.hibernate.cfg.SettingsFactory  - 默认实体模式：pojo 
 .19：06：54.700 [main] INFO org.hibernate.cfg.SettingsFactory  - 命名查询检查：启用
 .19：06：54.771 [main] INFO o.hibernate.impl.SessionFactoryImpl  - 建立会话工厂
 .19：06：55.035 [main] INFO ohimpl.SessionFactoryObjectFactory  - 不绑定工厂到JNDI，没有配置JNDI名称
 1 
 rajeev 
线程mainjava中的异常。 lang.NullPointerException 
 at com.bean.EmployeeDAO.saveEmployee（EmployeeDAO.java:15）
 at com.bean.Test.main（Test.java:13）
  
 
 
我无法找到这个错误，任何人都可以帮助我。下面是我的代码
 
 
 
我已经创建了这样的数据库表
 
 $ b 
  CREATE TABLE EMP1 
（
 ID NUMBER（10,0）NOT NULL PRIMARY KEY，
 NAME VARCHAR2（10）
）; 
  
 app-context.xml  
 
 
 <？xml version =1.0encoding =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-2.5.xsd\"> 
 
< bean class =org.apache.tomcat.dbcp.dbcp.BasicDataSourceid =dataSource> 
< property name =driverClassNamevalue =oracle.jdbc.driver.OracleDriver>< / property> 
< property name =urlvalue =jdbc：oracle：thin：@localhost：1521：xe>< / property> 
 < property name =passwordvalue =test>< / property> 
< / bean> 
 
< bean class =org.springframework.orm.hibernate3.LocalSessionFactoryBean
 id =mysessionFactory> 
 
< property name =dataSourceref =dataSource>< / property> 
< property name =mappingResources> 
< list> 
<值> Employee.hbm.xml< /值> 
< / list> 
< / property> 
< property name =hibernateProperties> 
<道具> 
< prop key =hibernate.dialect> org.hibernate.dialect.Oracle9Dialect< / prop> 
< prop key =hibernate.show_sql> true< / prop> 
< /道具> 
< / property> 
< / bean> 
 
< bean class =org.springframework.orm.hibernate3.HibernateTemplate
 id =hibernateTemplate> 
< property name =sessionFactoryref =mysessionFactory>< / property> 
< / bean> 
 
< bean class =com.bean.EmployeeDAOid =employeeDAO> 
< property name =hibernateTemplateref =hibernateTemplate>< / property> 
< / bean> 
< / beans> 
  
 EmployeeDAO.java 
  package com.bean; 
 
 import org.springframework.orm.hibernate3.HibernateTemplate; 
 
 public class EmployeeDAO {
 HibernateTemplate hibernateTemplate; 
 
 public void setHibernateTemplate（HibernateTemplate hibernateTemplate）{
 this.hibernateTemplate = hibernateTemplate; 
} 
 
 public void saveEmployee（Employee employee）{
 System.out.println（employee.getId（））; 
 System.out.println（employee.getName（））; 
 hibernateTemplate.save（employee）; 
} 
 
 public void updateEmployee（Employee employee）{
 hibernateTemplate.update（employee）; 
 
 
 $ / code $ / pre 
 $ b $ Employee.java 
 
 
  package com.bean; 
 
 public class Employee {
 private int id; 
私人字符串名称; 
 
 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; 
} 
 
} 
  
 Employee.hbm.xml  p> 
 
 
 <？xml version =1.0？> 
<！DOCTYPE hibernate-mapping PUBLIC -  // Hibernate / Hibernate映射DTD 3.0 // EN
http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\"> ; 
 <！ - 生成2014年9月3日9:01:05由Hibernate Tools 3.4.0.CR1  - > 
< hibernate-mapping> 
< class name =com.bean.Employeetable =EMP1> 
< id name =idtype =int> 
< column name =ID/> 
< generator class =assigned/> 
< / id> 
< property name =nametype =java.lang.String> 
< column name =NAME/> 
< / property> 
< / class> 
< / hibernate-mapping> 
  
 Test.java 
  package com.bean; 
 
 import org.springframework.context.ApplicationContext; 
 import org.springframework.context.support.ClassPathXmlApplicationContext; 
 
 public class Test {
 public static void main（String [] args）{
 ApplicationContext context = new ClassPathXmlApplicationContext（app-context.xml）; 
 Employee employee = new Employee（）; 
 employee.setName（rajeev）; 
 employee.setId（1）; 
 EmployeeDAO employeeDAO = new EmployeeDAO（）; 
 employeeDAO.saveEmployee（employee）; 
 
 
 
 
 
 
 $ p这是github链接
 git @ github .com：mcarajeev / spring-with-hibernate1.git 
解决方案
如果您创建 EmployeeDAO employeeDAO = new EmployeeDAO（）; 以这种方式HibernateTemplate属性为null。
 
 
 
尝试更改
 
 
   
 
 
 
 
 
 
 
 
 $ b $ $ b 
  EmployeeDAO employeeDAO =（EmployeeDAO）context.getBean（employeeDAO）;  
 
I am learning spring with hibernate integration.I am getting this exception
Exception in thread "main" java.lang.NullPointerException
Sep 04, 2014 7:06:50 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@4577357d: startup date [Thu Sep 04 19:06:50 IST 2014]; root of context hierarchy
Sep 04, 2014 7:06:50 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [app-context.xml]
Sep 04, 2014 7:06:51 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@30583b71: defining beans [dataSource,mysessionFactory,hibernateTemplate,employeeDAO]; root of factory hierarchy
.19:06:52.016 [main] INFO  org.hibernate.cfg.Environment - Hibernate 3.3.0.SP1 
.19:06:52.023 [main] INFO  org.hibernate.cfg.Environment - hibernate.properties not found 
.19:06:52.027 [main] INFO  org.hibernate.cfg.Environment - Bytecode provider name : javassist 
.19:06:52.032 [main] INFO  org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling 
.19:06:52.246 [main] INFO  org.hibernate.cfg.HbmBinder - Mapping class: com.bean.Employee -> EMP1 
Sep 04, 2014 7:06:52 PM org.springframework.orm.hibernate3.LocalSessionFactoryBean buildSessionFactory
INFO: Building new Hibernate SessionFactory
.19:06:52.320 [main] INFO  o.h.c.ConnectionProviderFactory - Initializing connection provider: org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider 
.19:06:54.660 [main] INFO  org.hibernate.cfg.SettingsFactory - RDBMS: Oracle, version: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production 
.19:06:54.660 [main] INFO  org.hibernate.cfg.SettingsFactory - JDBC driver: Oracle JDBC driver, version: 10.2.0.1.0XE 
.19:06:54.681 [main] INFO  org.hibernate.dialect.Dialect - Using dialect: org.hibernate.dialect.Oracle9Dialect 
.19:06:54.683 [main] WARN  org.hibernate.dialect.Oracle9Dialect - The Oracle9Dialect dialect has been deprecated; use either Oracle9iDialect or Oracle10gDialect instead 
.19:06:54.686 [main] INFO  o.h.t.TransactionFactoryFactory - Transaction strategy: org.springframework.orm.hibernate3.SpringTransactionFactory 
.19:06:54.688 [main] INFO  o.h.t.TransactionManagerLookupFactory - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended) 
.19:06:54.688 [main] INFO  org.hibernate.cfg.SettingsFactory - Automatic flush during beforeCompletion(): disabled 
.19:06:54.688 [main] INFO  org.hibernate.cfg.SettingsFactory - Automatic session close at end of transaction: disabled 
.19:06:54.688 [main] INFO  org.hibernate.cfg.SettingsFactory - JDBC batch size: 15 
.19:06:54.688 [main] INFO  org.hibernate.cfg.SettingsFactory - JDBC batch updates for versioned data: disabled 
.19:06:54.689 [main] INFO  org.hibernate.cfg.SettingsFactory - Scrollable result sets: enabled 
.19:06:54.689 [main] INFO  org.hibernate.cfg.SettingsFactory - JDBC3 getGeneratedKeys(): disabled 
.19:06:54.689 [main] INFO  org.hibernate.cfg.SettingsFactory - Connection release mode: auto 
.19:06:54.690 [main] INFO  org.hibernate.cfg.SettingsFactory - Default batch fetch size: 1 
.19:06:54.690 [main] INFO  org.hibernate.cfg.SettingsFactory - Generate SQL with comments: disabled 
.19:06:54.690 [main] INFO  org.hibernate.cfg.SettingsFactory - Order SQL updates by primary key: disabled 
.19:06:54.690 [main] INFO  org.hibernate.cfg.SettingsFactory - Order SQL inserts for batching: disabled 
.19:06:54.690 [main] INFO  org.hibernate.cfg.SettingsFactory - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory 
.19:06:54.692 [main] INFO  o.h.h.ast.ASTQueryTranslatorFactory - Using ASTQueryTranslatorFactory 
.19:06:54.692 [main] INFO  org.hibernate.cfg.SettingsFactory - Query language substitutions: {} 
.19:06:54.693 [main] INFO  org.hibernate.cfg.SettingsFactory - JPA-QL strict compliance: disabled 
.19:06:54.693 [main] INFO  org.hibernate.cfg.SettingsFactory - Second-level cache: enabled 
.19:06:54.693 [main] INFO  org.hibernate.cfg.SettingsFactory - Query cache: disabled 
.19:06:54.693 [main] INFO  org.hibernate.cfg.SettingsFactory - Cache region factory : org.hibernate.cache.impl.NoCachingRegionFactory 
.19:06:54.693 [main] INFO  org.hibernate.cfg.SettingsFactory - Optimize cache for minimal puts: disabled 
.19:06:54.693 [main] INFO  org.hibernate.cfg.SettingsFactory - Structured second-level cache entries: disabled 
.19:06:54.699 [main] INFO  org.hibernate.cfg.SettingsFactory - Echoing all SQL to stdout 
.19:06:54.700 [main] INFO  org.hibernate.cfg.SettingsFactory - Statistics: disabled 
.19:06:54.700 [main] INFO  org.hibernate.cfg.SettingsFactory - Deleted entity synthetic identifier rollback: disabled 
.19:06:54.700 [main] INFO  org.hibernate.cfg.SettingsFactory - Default entity-mode: pojo 
.19:06:54.700 [main] INFO  org.hibernate.cfg.SettingsFactory - Named query checking : enabled 
.19:06:54.771 [main] INFO  o.hibernate.impl.SessionFactoryImpl - building session factory 
.19:06:55.035 [main] INFO  o.h.impl.SessionFactoryObjectFactory - Not binding factory to JNDI, no JNDI name configured 
1
rajeev
Exception in thread "main" java.lang.NullPointerException
    at com.bean.EmployeeDAO.saveEmployee(EmployeeDAO.java:15)
    at com.bean.Test.main(Test.java:13)
I am unable to find the mistake,can anyone help me.Below is my code

I have created database table like this
CREATE TABLE  EMP1   
(    
    ID NUMBER(10,0) NOT NULL PRIMARY KEY,   
    NAME VARCHAR2(10)   
);
app-context.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-2.5.xsd">

    <bean class="org.apache.tomcat.dbcp.dbcp.BasicDataSource" id="dataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe"></property>
        <property name="username" value="test"></property>
        <property name="password" value="test"></property>
    </bean>

    <bean class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
        id="mysessionFactory">

        <property name="dataSource" ref="dataSource"></property>
        <property name="mappingResources">
            <list>
                <value>Employee.hbm.xml</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

    <bean class="org.springframework.orm.hibernate3.HibernateTemplate"
        id="hibernateTemplate">
        <property name="sessionFactory" ref="mysessionFactory"></property>
    </bean>

    <bean class="com.bean.EmployeeDAO" id="employeeDAO">
        <property name="hibernateTemplate" ref="hibernateTemplate"></property>
    </bean>
</beans>
EmployeeDAO.java
package com.bean;

import org.springframework.orm.hibernate3.HibernateTemplate;

public class EmployeeDAO {
    HibernateTemplate hibernateTemplate;

    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }

    public void saveEmployee(Employee employee){
        System.out.println(employee.getId());
        System.out.println(employee.getName());
        hibernateTemplate.save(employee);
    }

    public void updateEmployee(Employee employee){
        hibernateTemplate.update(employee);
    }
}
Employee.java
package com.bean;

public class Employee {
    private int id;
    private String name;

    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;
    }

}
Employee.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 3, 2014 9:01:05 PM by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
    <class name="com.bean.Employee" table="EMP1">
        <id name="id" type="int">
            <column name="ID" />
            <generator class="assigned" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>
    </class>
</hibernate-mapping>
Test.java
package com.bean;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args) {
        ApplicationContext context=new ClassPathXmlApplicationContext("app-context.xml");
        Employee employee=new Employee();
        employee.setName("rajeev");
        employee.setId(1);
        EmployeeDAO employeeDAO=new EmployeeDAO();
        employeeDAO.saveEmployee(employee);
    }
}
this is github link
[e-mail]:mcarajeev/spring-with-hibernate1.git
解决方案
If you create EmployeeDAO employeeDAO=new EmployeeDAO(); in this way the attribute HibernateTemplate is null.

try to change 

EmployeeDAO employeeDAO=new EmployeeDAO();

in 

EmployeeDAO employeeDAO= (EmployeeDAO) context.getBean("employeeDAO");

                        
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