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

hibernate, java, jpa, persistence, spring

Solution

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

<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.domain` package (marked with `@Entity` annotation) will be loaded without declaring them in XML.

UPDATE You need to declarate a data source, for example:

<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 `entityManager` exactly as you were doing. I suppose you are using something similar in your DAO classes:

@PersistenceContext
private EntityManager em;

Problem

I am getting the following exception in my project: Class "com.testApp.domain.Register" is managed, but is not listed in the persistence.xml file My `persistence.xml` file looks like that: ``` <?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 post and 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`. Any suggestions for a solution and to solve my error? I appreciate your reply! UPDATE My `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> ```

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