实体扫描在 JPA/hibernate/spring 应用程序中不起作用

Question

我的applicationContext.xml是：

<aop:aspectj-autoproxy/>

<context:component-scan base-package="com"/>
<context:annotation-config/>

<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
<tx:jta-transaction-manager/>
<tx:annotation-driven/>

<jee:jndi-lookup id="corePU" jndi-name="java:/exampleDatasource" expected-type="javax.sql.DataSource"/>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceXmlLocation" value="classpath:/META-INF/persistence.xml" />
    <property name="persistenceUnitName" value="corePU" />
    <property name="packagesToScan" value="com" />
</bean>

每个实体都有 @Entity 并且在 persistence.xml 之后设置属性

<exclude-unlisted-classes>false</exclude-unlisted-classes>

Hibernate version : 5.1.0.Final
Spring version : 4.1.3.RELEASE
JPA 2.0
WildFly 10

在 applicationContext.xml 中，我定义了一个 entityManagerFactory bean，如下所示

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceXmlLocation" value="classpath:/META-INF/persistence.xml" />
    <property name="persistenceUnitName" value="corePU" />
    <property name="packagesToScan" value="com" />
</bean>

persistence.xml如下：

<persistence-unit name="corePU" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <jta-data-source>java:/exampleDatasource</jta-data-source>
    <!--<class>com.entity.Address</class>-->

    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <!--<shared-cache-mode>NONE</shared-cache-mode>-->
    <properties>
        <property name="hibernate.hbm2ddl.auto" value="validate" />

        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
        <property name="hibernate.show_sql" value="false"/>
        <property name="hibernate.format_sql" value="false"/>
        <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.JBossStandAloneJtaPlatform"/>
        <property name="org.hibernate.envers.audit_table_prefix" value="z_"/>
        <property name="hibernate.cache.use_second_level_cache" value="false" />
        <property name="hibernate.generate_statistics" value="false"/>
        <property name="hibernate.cache.use_query_cache" value="false"/>
        <property name="hibernate.archive.autodetection" value="class, hbm" />

    </properties>
</persistence-unit>

下面是我得到的错误：

21:15:47,463 ERROR [stderr] (default task-4) java.lang.IllegalArgumentException: Unknown entity: com.entity.Address
21:15:47,463 ERROR [stderr] (default task-4)    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1149)
21:15:47,464 ERROR [stderr] (default task-4)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
21:15:47,464 ERROR [stderr] (default task-4)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
21:15:47,464 ERROR [stderr] (default task-4)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
21:15:47,464 ERROR [stderr] (default task-4)    at java.lang.reflect.Method.invoke(Method.java:498)
21:15:47,464 ERROR [stderr] (default task-4)    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:347)
21:15:47,464 ERROR [stderr] (default task-4)    at com.sun.proxy.$Proxy93.persist(Unknown Source)
21:15:47,464 ERROR [stderr] (default task-4)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
21:15:47,464 ERROR [stderr] (default task-4)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
21:15:47,464 ERROR [stderr] (default task-4)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
21:15:47,464 ERROR [stderr] (default task-4)    at java.lang.reflect.Method.invoke(Method.java:498)
21:15:47,465 ERROR [stderr] (default task-4)    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:298)
21:15:47,465 ERROR [stderr] (default task-4)    at com.sun.proxy.$Proxy50.persist(Unknown Source)
21:15:47,465 ERROR [stderr] (default task-4)    at com.manager.manager.getAddress(manager.java:37)
21:15:47,465 ERROR [stderr] (default task-4)    at com.manager.manager$$FastClassBySpringCGLIB$$e766fff.invoke(<generated>)
21:15:47,465 ERROR [stderr] (default task-4)    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)

如果不在 persistence.xml 中使用 class 标签明确指定每个实体，我该如何使用我的实体？

Answer 1

您应该在 entityManager / sessionFactory 配置中设置 packagesToScan 属性。

例如：

packagesToScan="com.manager"

或者，如果您使用的是 Spring 引导，则可以使用 @EntityScan 注释：

Spring Boot 1.4+

Spring Boot < 1.4

Answer 2

JPA 和 Spring 是两个不同的东西。

Spring的<context:component-scan base-package="..."/>一般与JPA无关。它指的是 Spring 组件、容器等。但在幕后，当然，Spring 使用 JPA，并且有两种可能的配置：

配置Spring到读取persistence.xml，完全依赖它；
不要使用 persistence.xml 并仅使用 Spring 配置 - 另一种类型的配置，您可以在其中使用 LocalContainerEntityManagerFactoryBean 属性packagesToScan。请参阅此 post，例如：.

查看 Spring javadoc 对 packagesToScan:

的描述

Set whether to use Spring-based scanning for entity classes in the classpath instead of using JPA's standard scanning of jar files with persistence.xml markers in them. In case of Spring-based scanning, no persistence.xml is necessary; all you need to do is to specify base packages to search here.

如果你想使用persistence.xml，你有几个选择：

写入每个实体class - JPA 不支持自动扫描（嗯，差不多，看下一个选项）；
不要编写每个实体 class，而是将您的实体放在一个 jar 中并设置 jar-file 属性指向它 - JPA 仅支持这种自动 -扫描；
如果您不介意不符合 JPA 规范（即使用 JPA 本身没有的特定提供程序功能），您可以使用 Hibernate 自动扫描 功能:

Hibernate 自动扫描 功能：

<persistence-unit name="unitName" transaction-type="RESOURCE_LOCAL">
  <!-- This is required to be spec compliant, Hibernate however supports
       auto-detection even in JSE.
  <class>com.entity.User</class>
  <class>com.entity.Address</class>
  ...
   -->

  <properties>
    <!-- Scan for annotated classes and Hibernate mapping XML files -->
    <property name="hibernate.archive.autodetection" value="class, hbm"/>
    ...
  </properties>
</persistence-unit>

实体扫描在 JPA/hibernate/spring 应用程序中不起作用

Entity scanning not working in JPA/hibernate/spring application

java

spring

hibernate

jpa

wildfly-10