Frühling Autowired Objekt ist immer Null

Question

package plantSiteMinder.user.impl; 
import java.util.List; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.stereotype.Service; 
import org.springframework.transaction.annotation.Transactional; 
import plantSiteMinder.dao.UserDAO; 
import plantSiteMinder.model.User; 
import plantSiteMinder.user.UserAuthenticator; 
@Service 
@Transactional(readOnly = true) 
public class UserAuthenticatorImpl implements UserAuthenticator { 
    @Autowired 
    private UserDAO userDAO; 
    public List<User> findAllUsers() { 
     return userDAO.findAllUsers(); 
    } 
} 

============================ Spring.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"  
xmlns:context="http://www.springframework.org/schema/context" 
xmlns:tx="http://www.springframework.org/schema/tx" 
xmlns:p="http://www.springframework.org/schema/p" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx.xsd"> 
<!-- <tx:annotation-driven /> --> 
<bean id="userDAO" class="plantSiteMinder.dao.impl.UserDAOImpl" /> 
<bean id="userAuth"  
class="plantSiteMinder.user.impl.UserAuthenticatorImpl"/> 
<!-- <context:component-scan base-package="plantSiteMinder.dao.impl" /> 
<context:component-scan base-package="plantSiteMinder.user.impl" /> --> 
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" 
    destroy-method="close"> 
    <property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
    <property name="url" value="jdbc:mysql://localhost:3306/poc_data" /> 
    <property name="username" value="root" /> 
    <property name="password" value="root" /> 
</bean> 

<bean id="entityManagerFactory" 
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
    <property name="persistenceUnitName" value="myPU" /> 
    <property name="dataSource" ref="dataSource" /> 
</bean> 

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> 
    <property name="entityManagerFactory" ref="entityManagerFactory" /> 
</bean> 

============ =========== Hauptklasse =======================

package plantSiteMinder.plantSiteMinder; 
import java.util.List; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
import plantSiteMinder.model.User; 
import plantSiteMinder.user.impl.UserAuthenticatorImpl; 
public class App 
{ 
    public static void main(String[] args) 
    { 
     ApplicationContext ctx = new ClassPathXmlApplicationContext(
      "spring.xml"); 

     UserAuthenticatorImpl userManager = (UserAuthenticatorImpl) 
     ctx.getBean("userAuth"); 
     List<User> list = userManager.findAllUsers(); 
     System.out.println("User count: " + list.size()); 
    } 

}

UserDAO ist immer null. Wie kann dies behoben werden? Das Problem kann nicht gefunden werden.

========================= Benutzer DAO Impl ================== =========

package plantSiteMinder.dao.impl; 
import java.util.List; 
import javax.persistence.EntityManager; 
import javax.persistence.PersistenceContext; 
import javax.persistence.criteria.CriteriaBuilder; 
import javax.persistence.criteria.CriteriaQuery; 
import javax.persistence.criteria.Root; 
import org.springframework.stereotype.Repository; 
import plantSiteMinder.dao.UserDAO; 
import plantSiteMinder.model.User; 
@Repository 
public class UserDAOImpl implements UserDAO{ 
    @PersistenceContext 
    private EntityManager entityManager; 
    public List<User> findAllUsers() { 
    CriteriaBuilder builder = entityManager.getCriteriaBuilder(); 
    CriteriaQuery<User> cq = builder.createQuery(User.class); 
    Root<User> root = cq.from(User.class); 
    cq.select(root); 
    return entityManager.createQuery(cq).getResultList(); 
    } 
} 

======================= pom.xml ======== ================

<project xmlns="http://maven.apache.org/POM/4.0.0"  
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0  
http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
<modelVersion>4.0.0</modelVersion> 
<groupId>plantSiteMinder</groupId> 
<artifactId>plantSiteMinder</artifactId> 
<version>0.0.1-SNAPSHOT</version> 
<packaging>jar</packaging> 
<name>plantSiteMinder</name> 
<url>http://maven.apache.org</url> 
<properties> 
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
    <spring.version>4.0.3.RELEASE</spring.version> 
    <hibernate.version>4.3.5.Final</hibernate.version> 
</properties> 
<dependencies> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-core</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-context</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.springframework</groupId> 
     <artifactId>spring-orm</artifactId> 
     <version>${spring.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.hibernate</groupId> 
     <artifactId>hibernate-entitymanager</artifactId> 
     <version>${hibernate.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.commons</groupId> 
     <artifactId>commons-dbcp2</artifactId> 
     <version>2.0</version> 
    </dependency> 
    <dependency> 
     <groupId>mysql</groupId> 
     <artifactId>mysql-connector-java</artifactId> 
     <version>5.1.30</version> 
    </dependency> 
</dependencies> 

I am using Java 8 for this project

Answer 1

XML-Konfigurations immer überschreibt die Annotation-Konfig.

Eine der Lösungen wäre

<bean id="userDAO" class="plantSiteMinder.dao.impl.UserDAOImpl" /> 
<bean id="userAuth"  
class="plantSiteMinder.user.impl.UserAuthenticatorImpl"/> 

von XML-Konfigurations zu entfernen und Kommentar- diese Zeilen:

<context:annotation-config /> 
<context:component-scan base-package="plantSiteMinder.user.impl" /> 

<tx:annotation-driven transaction-manager="transactionManager"/> 

Sie müssen bedenken Sie aber, dass Sie die Session müssten @Autowire in Ihrem DAo.