Java 类受管理，但未列在 persistence.xml 文件中

Class is managed, but is not listed in the persistence.xml file

提问by Anna.Klee

I am getting the following exception in my project:

我在我的项目中遇到以下异常：

Class "com.testApp.domain.Register" is managed, but is not listed in the persistence.xml file

类“com.testApp.domain.Register”被管理，但未在persistence.xml文件中列出

My persistence.xmlfile looks like that:

我的persistence.xml文件看起来像这样：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
    xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">

    <persistence-unit name="default" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.archive.detection" value="class, hbm" />
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />

            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
            <property name="hibernate.hbm2ddl.auto" value="update" />

            <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" />
            <property name="hibernate.connection.url" value="jdbc:hsqldb:mem:." />
            <property name="hibernate.connection.username" value="SA" />
            <property name="hibernate.connection.password" value="" />

            <property name="hibernate.c3p0.min_size" value="5" />
            <property name="hibernate.c3p0.max_size" value="20" />
            <property name="hibernate.c3p0.timeout" value="300" />
            <property name="hibernate.c3p0.max_statements" value="50" />
            <property name="hibernate.c3p0.idle_test_period" value="3000" />

        </properties>
    </persistence-unit>

</persistence>

I have tried this postand this, both suggest to add the class manually or automatically to the persistence.xml. Others say its a eclipse related issue and can be solved by cleaning or reopening of the project. However, I want that these classes get autodetected by hibernate and not manually add them to my persistence.xml.

我已经尝试过这篇文章和这篇文章，都建议手动或自动将类添加到persistence.xml. 其他人说这是一个与日食相关的问题，可以通过清理或重新打开项目来解决。但是，我希望这些类被休眠自动检测到，而不是手动将它们添加到我的persistence.xml.

Any suggestions for a solution and to solve my error?

关于解决方案和解决我的错误的任何建议？

I appreciate your reply!

我很感激你的回复！

UPDATE

更新

My applicationContext.xml:

我的applicationContext.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:security="http://www.springframework.org/schema/security"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jee="http://www.springframework.org/schema/jee"
    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-3.0.xsd
                        http://www.springframework.org/schema/aop 
                        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
                        http://www.springframework.org/schema/jee 
                        http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
                        http://www.springframework.org/schema/security
                        http://www.springframework.org/schema/security/spring-security-3.1.xsd">

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

    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />

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

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

    <bean id="entityManager" class="org.springframework.orm.jpa.support.SharedEntityManagerBean">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

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

</beans>

采纳答案by davioooh

If you are using Spring you could avoid persistence.xmlfile and declare instead an entity manager factory like this:

如果您使用的是 Spring，您可以避免persistence.xmlfile 并声明一个实体管理器工厂，如下所示：

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="yourDataSource" />
    <property name="packagesToScan" value="com.testApp.domain" />
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
            <property name="databasePlatform" value="org.hibernate.dialect.HSQLDialect" />
        </bean>
    </property>
</bean>

All the entities in com.testApp.domainpackage (marked with @Entityannotation) will be loaded without declaring them in XML.

com.testApp.domain包中的所有实体（用@Entity注释标记）将被加载，而无需在 XML 中声明它们。

UPDATEYou need to declarate a data source, for example:

UPDATE你需要声明一个数据源，例如：

<bean id="yourDataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="org.hsqldb.jdbcDriver" />
    <property name="url" value="jdbc:hsqldb:mem:." />
    <property name="username" value="SA" />
    <property name="password" value="" />
    <property name="initialSize" value="5" />
    <property name="maxActive" value="20" />
</bean>

Then you can use the entityManagerexactly as you were doing. I suppose you are using something similar in your DAO classes:

然后你可以entityManager完全按照你的方式使用。我想您在 DAO 类中使用了类似的东西：

@PersistenceContext
private EntityManager em;

回答by gleitonfranco

If you are using Eclipse:(1) Select: (Your Project) -> Properties -> JPA; (2) Look for "Persistent class management" and select the option "Discover annotated classes automatically"; (3) Press "Apply".

如果您使用的是 Eclipse：(1) 选择：（您的项目）-> 属性 -> JPA；（2）找到“持久化类管理”，选择“自动发现带注释的类”选项；(3) 按“申请”。

回答by PedroPK

If it is an Eclipse problem, go to:

如果是 Eclipse 问题，请转到：

Preferences >> Java Persistence >> JPA >> Errors/Warnings >> Type

in the following itens, mark then as Ignore:

在以下项目中，将 then 标记为Ignore：

• Class is annotated, but is not listed in the persistence.xml file
• Class is managed, but is not listed in the persistence.xml file

• 类已注释，但未列在persistence.xml 文件中
• 类受管理，但未列在 persistence.xml 文件中