Spring, varlık yöneticisi fabrikasını enjekte etmiyor

Question

JPA'yı kullanarak, JPO sağlayıcısı olarak Hibernate ve Spring 3.2 kullanarak DAO sınıfları için test yapıyorum. Varlık yöneticisini doğru şekilde enjekte edemiyorum, erişmeye çalışırken bir NullPointerException alıyorum. Benim GenericDAO uygulama aşağıdaki gibi görünür:

@Repository 
public class GenericDAOImpl implements GenericDAO { 

    @PersistenceContext(unitName="unitname") 
    private EntityManager entityManager; 

    public EntityManager getEntityManager() { 
     return entityManager; 
    } 


    public void setEntityManager(EntityManager entityManager) { 
     this.entityManager = entityManager; 
    } 

    // NullPointerException when calling this, entityManager is null 
    public Query createNamedQuery(String name) { 
     return entityManager.createNamedQuery(name); 
    }   

    // many other methods.... 
} 

testin sınıf şuna benzer:

<?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:aop="http://www.springframework.org/schema/aop" 
    xmlns:beans="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx" 
    xsi:schemaLocation=" 
     http://www.springframework.org/schema/aop 
     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
     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/mvc 
     http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd   
     http://www.springframework.org/schema/tx 
     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd 
     " 
> 

    <!-- Root Context: defines shared resources visible to all other web components --> 

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
     <property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
     <property name="username" value="root" /> 
     <property name="password" value="root" /> 
    </bean> 

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
     <property name="persistenceUnitName" value="unitname" /> 
     <property name="dataSource" ref="dataSource" /> 
     <property name="packagesToScan" value="com.main" /> 
     <property name="jpaVendorAdapter"> 
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> 
       <property name="showSql" value="true" /> 
       <property name="generateDdl" value="false" /> 
       <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" /> 
      </bean> 
     </property> 
    </bean> 

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

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" /> 



    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="false" /> 
    <context:component-scan base-package="com.main" /> 
    <context:annotation-config /> 

</beans> 

Ben ettik:

@RunWith(SpringJUnit4ClassRunner.class) 
@ContextConfiguration(locations = { "/com/main/resources/root-context.xml", "/com/main/resources/servlet-context.xml"}) 
public class TestModel { 

    @Before 
    public void setUp() throws Exception{ 
     ... 
    } 

    @Test 
    public void test(){ 
     ... 
    } 
} 

Benim kök context.xml şudur Diğer SO sorularında önerildiği gibi PersistenceAnnotationBeanPostProcessor ekleyerek bile, çeşitli yaklaşımlar başarılı olmadan çalıştı. Diğer her şey iyi çalışıyor gibi görünüyor: Hazırda bekletme veritabanı tabloları oluşturur, içerik yüklenir vb. Ne yapıyorum yanlış?

Düzenleme:

java.lang.NullPointerException 
    at com.main.model.dao.JPAImpl.GenericDAOImpl.createNamedQuery(GenericDAOImpl.java:119) 
    at com.main.model.bo.DescriptorBO.persist(DescriptorBO.java:52) 
    at com.main.webmodule.JSONSerializer.deserialize(JSONSerializer.java:149) 
    at com.main.tests.TestModel.test(TestModel.java:86) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:601) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) 
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) 
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

Ve burada persistence.xml geçerli:: yığın izleme şudur

<?xml version="1.0" encoding="UTF-8"?><persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"> 
    <persistence-unit name="unitname" transaction-type="RESOURCE_LOCAL"> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 
     <mapping-file>META-INF/jpql/NamedQueries.xml</mapping-file> 


     <class>com.main.model.Account</class> 
     <class>com.main.model.Action</class> 
     <class>com.main.model.Device</class> 
     <class>com.main.model.DeviceDescriptor</class> 
     <class>com.main.model.Event</class> 
     <class>com.main.model.File</class> 
     <class>com.main.model.Rule</class> 
     <class>com.main.model.StateVar</class> 
     <class>com.main.model.Argument</class> 
     <exclude-unlisted-classes>false</exclude-unlisted-classes> 


     <properties> 

      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/> 
      <property name="hibernate.connection.username" value="root"/> 
      <property name="hibernate.connection.password" value="root"/> 
      <property name="hibernate.connection.provider_class" value="org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider" /> 
      <property name="hibernate.connection.autocommit" value="true"/> 
      <property name="hibernate.connection.release_mode" value="auto"/> 
      <property name="hibernate.connection.url" value="jdbc:mysql://127.0.0.1:3306/testweb"/> 
      <property name="hibernate.hbm2ddl.auto" value="create"/> 

      <property name="hibernate.c3p0.min_size" value="1" /> 
      <property name="hibernate.c3p0.max_size" value="10" /> 
      <property name="hibernate.c3p0.acquire_increment" value="1" /> 
      <property name="hibernate.c3p0.idle_test_period" value="300" /> 
      <property name="hibernate.c3p0.max_statements" value="0" /> 
      <property name="hibernate.c3p0.timeout" value="100" /> 

      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> 

     </properties> 




    </persistence-unit> 
</persistence> 

Answer 1

Sonunda sorunu çözmek için başardınız. Bu şekilde örneği edildi

@Autowired 
private GenericDAO genericDao; 

ama DescriptorBO denilen Böyle sınıfı,: GenericDAO örneğini ben bir autowired ek açıklama, bu şekilde kullanılan

DescriptorBO descrBO = new DescriptorBO(...); 

ve böylece kontrolü tamamen kurtuldu Bahar konteyner içine bu değiştirme:

@Autowired 
private DescriptorBO descrBO; 

ve kök-context.xml uygun fasulye tanımları ekleyerek:

<bean name="descriptorBO" class="com.main.model.bo.DescriptorBO"> 
    <property name="genericDao" ref="genericDao" /> 
</bean> 

<bean name="genericDao" class="com.main.model.dao.JPAImpl.GenericDAOImpl" /> 

sorunu çözdü. Artık EntityManager düzgün şekilde enjekte edilir.

Ders öğrenildi: Eğer Spring EntityManager'ı (veya başka bir enjekte edilmiş nesneyi) enjekte etmezse, nesnenin üzerindeki tüm nesne hiyerarşisinin Spring, i. e. Uygulama bağlamında, ya doğrudan ya da Otomatik Kablolu notu kullanarak çekirdeklerden başlatılır. Bu nesneleri herhangi birini başlatmak için yeni operatörü kullanmadığınızı kontrol edin!