春天與Hibernate - 與Hibernate integration.I異常線程「main」顯示java.lang.NullPointerException

我學習春天正在此例外春天與Hibernate - 與Hibernate integration.I異常線程「main」顯示java.lang.NullPointerException

Exception in thread "main" java.lang.NullPointerException 
Sep 04, 2014 7:06:50 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 
INFO: Refreshing org[email protected]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.s[email protected]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)

我無法發現其中的錯誤，誰能幫助我。下面是我的代碼

這樣

CREATE TABLE EMP1 
( 
    ID NUMBER(10,0) NOT NULL PRIMARY KEY, 
    NAME VARCHAR2(10) 
);

APP-context.xml中，我創建數據庫表

<?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); 
    } 
}

這是GitHub的鏈接 [email protected]：mcarajeev /彈簧與-hibernate1.git

來源

2014-09-04 rajeev pani..

您沒有使用在簧構成你AER創建一個新的DAO請張貼堆棧跟蹤 – geoand 2014-09-04 14:03:25

。從上下文中檢索道。 – 2014-09-04 14:06:38

[Spring Dependency Injection Autowiring Null]的可能的重複（http://stackoverflow.com/questions/8091203/spring-dependency-injection-autowiring-null） – 2014-09-04 14:14:47

如果以這種方式創建屬性的HibernateTemplate是空EmployeeDAO employeeDAO=new EmployeeDAO();。

試圖改變

EmployeeDAO employeeDAO=new EmployeeDAO();

在

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

來源

2014-09-04 14:11:10 Xstian

春天與Hibernate - 與Hibernate integration.I異常線程「main」顯示java.lang.NullPointerException

回答

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