java 没有定义类型 [javax.persistence.EntityManager] 的唯一 bean
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No unique bean of type [javax.persistence.EntityManager] is defined
提问by user294241
I am using JUnit 4 to test Dao Access with Spring (annotations) and JPA (hibernate). The datasource is configured through JNDI(Weblogic) with an ORacle(Backend). This persistence is configured with just the name and a RESOURCE_LOCAL transaction-type
我正在使用 JUnit 4 通过 Spring（注释）和 JPA（休眠）测试 Dao Access。数据源是通过 JNDI(Weblogic) 和 ORacle(Backend) 配置的。这种持久性只配置了名称和 RESOURCE_LOCAL 事务类型
The application context file contains notations for annotations, JPA config, transactions, and default package and configuration for annotation detection. I am using Junit4 like so:
应用程序上下文文件包含注释的注释、JPA 配置、事务以及注释检测的默认包和配置。我像这样使用 Junit4：
ApplicationContext
应用上下文
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="workRequest"/>
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform" value="${database.target}"/>
<property name="showSql" value="${database.showSql}" />
<property name="generateDdl" value="${database.generateDdl}" />
</bean>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName">
<value>workRequest</value>
</property>
<property name="jndiEnvironment">
<props>
<prop key="java.naming.factory.initial">weblogic.jndi.WLInitialContextFactory</prop>
<prop key="java.naming.provider.url">t3://localhost:7001</prop>
</props>
</property>
</bean>
<bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="workRequest"/>
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="databasePlatform" value="${database.target}"/>
<property name="showSql" value="${database.showSql}" />
<property name="generateDdl" value="${database.generateDdl}" />
</bean>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName">
<value>workRequest</value>
</property>
<property name="jndiEnvironment">
<props>
<prop key="java.naming.factory.initial">weblogic.jndi.WLInitialContextFactory</prop>
<prop key="java.naming.provider.url">t3://localhost:7001</prop>
</props>
</property>
</bean>
<bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
JUnit TestCase
JUnit 测试用例
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
public class AssignmentDaoTest {
private AssignmentDao assignmentDao;
@Test
public void readAll() {
assertNotNull("assignmentDao cannot be null", assignmentDao);
List<Assignment> assignments = assignmentDao.findAll();
assertNotNull("There are no assignments yet", assignments);
}
}
regardless of what changes I make I get:
No unique bean of type [javax.persistence.EntityManager] is defined
无论我做了什么改变，我都会得到：
No unique bean of type [javax.persistence.EntityManager] is defined
Any hint on what this could be. I am running the tests inside eclipse.
关于这可能是什么的任何提示。我正在 eclipse 中运行测试。
回答by skaffman
Your Spring context has a bean definition using LocalContainerEntityManagerFactoryBean. This creates an EntityManagerFactory, not an EntityManager.
您的 Spring 上下文有一个使用LocalContainerEntityManagerFactoryBean. 这将创建一个EntityManagerFactory，而不是一个EntityManager。
AssignmentDaoneeds to get itself wired with an EntityManagerFactory.
AssignmentDao需要自己连接一个EntityManagerFactory.
Alternatively, you can replace the LocalContainerEntityManagerFactoryBeanwith a LocalEntityManagerFactoryBean, which willcreate an EntityManagerdirectly. However, you need to be careful with that one, it has some downsides. See that part of the Spring docsfor a full explanation of the options.
或者，您可以将 替换LocalContainerEntityManagerFactoryBean为LocalEntityManagerFactoryBean，这将EntityManager直接创建。但是，你需要小心那个，它有一些缺点。有关选项的完整说明，请参阅Spring 文档的那部分。
It's confusing, because the naming conventions of JPA and Spring overlap each other, so naming these classes is a real bugger.
令人困惑，因为 JPA 和 Spring 的命名约定相互重叠，所以命名这些类是一个真正的问题。
