Java JPA所有对象仍存储在EntityManager中

我有一个用Spring数据创建的web应用程序，它使用JpaRepository（org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean和org.springframework.orm.jpa.vendor.hibernatejbavenderadapter）在服务器正常运行一段时间后，我注意到堆一直在增长

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" p:database="${jdbc.databaseType}"
              p:generateDdl="true" p:showSql="false"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.enable_lazy_load_no_trans">true</prop>
            <prop key="hibernate.ejb.naming_strategy">com.example.db.repository.FixedDefaultComponentSafeNamingStrategy</prop>

            <prop key="hibernate.connection.CharSet">utf8</prop>
            <prop key="hibernate.connection.characterEncoding">utf8</prop>
            <prop key="hibernate.connection.useUnicode">true</prop>
        </props>
    </property>
</bean>

<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager" p:entityManagerFactory-ref="entityManagerFactory">
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
</bean>

在进行堆转储之后，它显示堆包含的实体比我当前使用的要多得多

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" p:database="${jdbc.databaseType}"
              p:generateDdl="true" p:showSql="false"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.enable_lazy_load_no_trans">true</prop>
            <prop key="hibernate.ejb.naming_strategy">com.example.db.repository.FixedDefaultComponentSafeNamingStrategy</prop>

            <prop key="hibernate.connection.CharSet">utf8</prop>
            <prop key="hibernate.connection.characterEncoding">utf8</prop>
            <prop key="hibernate.connection.useUnicode">true</prop>
        </props>
    </property>
</bean>

<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager" p:entityManagerFactory-ref="entityManagerFactory">
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
</bean>

所以我的问题是如何管理EntityManager来清除不再使用的实体

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" p:database="${jdbc.databaseType}"
              p:generateDdl="true" p:showSql="false"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.enable_lazy_load_no_trans">true</prop>
            <prop key="hibernate.ejb.naming_strategy">com.example.db.repository.FixedDefaultComponentSafeNamingStrategy</prop>

            <prop key="hibernate.connection.CharSet">utf8</prop>
            <prop key="hibernate.connection.characterEncoding">utf8</prop>
            <prop key="hibernate.connection.useUnicode">true</prop>
        </props>
    </property>
</bean>

<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager" p:entityManagerFactory-ref="entityManagerFactory">
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
</bean>

以下是jpa配置：

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" p:database="${jdbc.databaseType}"
              p:generateDdl="true" p:showSql="false"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.enable_lazy_load_no_trans">true</prop>
            <prop key="hibernate.ejb.naming_strategy">com.example.db.repository.FixedDefaultComponentSafeNamingStrategy</prop>

            <prop key="hibernate.connection.CharSet">utf8</prop>
            <prop key="hibernate.connection.characterEncoding">utf8</prop>
            <prop key="hibernate.connection.useUnicode">true</prop>
        </props>
    </property>
</bean>

<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager" p:entityManagerFactory-ref="entityManagerFactory">
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
</bean>

<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaVendorAdapter">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" p:database="${jdbc.databaseType}"
              p:generateDdl="true" p:showSql="false"/>
    </property>
    <property name="jpaProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.enable_lazy_load_no_trans">true</prop>
            <prop key="hibernate.ejb.naming_strategy">com.example.db.repository.FixedDefaultComponentSafeNamingStrategy</prop>

            <prop key="hibernate.connection.CharSet">utf8</prop>
            <prop key="hibernate.connection.characterEncoding">utf8</prop>
            <prop key="hibernate.connection.useUnicode">true</prop>
        </props>
    </property>
</bean>

<bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager" p:entityManagerFactory-ref="entityManagerFactory">
    <property name="jpaDialect">
        <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
</bean>

更新
真的
com.example.db.repository.FixedDefaultComponentSafeNamingStrategy
utf8
utf8
真的

您是否使用了

OpenEntityManagerViewFilter

？不，您认为这样可以解决问题吗？我不需要在每个连接上打开事务，在第一次访问时，我从数据库加载所有内容，在最后一次保存。为您的dao和一些配置发布代码。我猜不正确地使用事务，或者在未关闭的情况下自己乱动

EntityManager

实例。在编辑的问题中，我添加了jpa配置。我唯一使用的是JPA还原方法，比如findBy…，findOne，save，仅此而已。Dao并不复杂。如果实体保留在内存中，那么您一定是在某处引用它们？您没有将它们分配给某个实例变量吗？还要确保YOU具有正确的tx设置（

在您的配置中）。不相关，但用于清理您的

hibernate.connection.

属性是无用的，因为您正在注入数据源。为您保存3行xml）。