Spring 3.2.1 + hibernate-core 4.2.0：merge（）无效

时间：2013-11-19 18:07:02

标签： java spring hibernate spring-mvc jpa

我开始使用springapp示例学习Spring进行Web开发。现在，我正在尝试提高列表中每个产品的价格（从数据库中检索），然后使用新价格保存回数据库。它可以检索产品列表但合并不会执行任何操作。我在代码中添加了.flush（），它给出了一个丑陋的异常（就在应用程序启动时）。

这是应用程序启动时抛出的异常（在调用方法调用.flush（）之前）：

javax.persistence.TransactionRequiredException: no transaction is in progress
at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:993)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:366)
at $Proxy18.flush(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:241)
at $Proxy18.flush(Unknown Source)
at org.springtest.mavenspringapp.repository.JPAProductDao.saveProduct(JPAProductDao.java:34)
at org.springtest.mavenspringapp.service.SimpleProductManager.increasePrice(SimpleProductManager.java:35)
at org.springtest.mavenspringapp.web.PriceIncreaseFormController.onSubmit(PriceIncreaseFormController.java:38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

这是我提高每个产品的价格并调用.merge（）后跟.flush（）：

javax.persistence.TransactionRequiredException: no transaction is in progress
org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:993)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:366)
$Proxy18.flush(Unknown Source)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:241)
$Proxy18.flush(Unknown Source)
org.springtest.mavenspringapp.repository.JPAProductDao.saveProduct(JPAProductDao.java:34)
org.springtest.mavenspringapp.service.SimpleProductManager.increasePrice(SimpleProductManager.java:35)
org.springtest.mavenspringapp.web.PriceIncreaseFormController.onSubmit(PriceIncreaseFormController.java:38)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

这是ProductDao：

@Repository(value = "productDao")
public class JPAProductDao implements ProductDao {

    private EntityManager em = null;

    /*
     * Sets the entity manager.
     */
    @PersistenceContext
    public void setEntityManager(EntityManager em) {
        this.em = em;
    }

    @Transactional(readOnly = true)
    @SuppressWarnings("unchecked")
    public List<Product> getProductList() {
        return em.createQuery("select p from Product p").getResultList();
    }

    @Transactional(readOnly = false)
    public void saveProduct(Product prod) {
        em.merge(prod);
        em.flush();
    }

}

这是我的控制器处理价格上涨形式的方法：

@RequestMapping(method = RequestMethod.POST)
public String onSubmit(@Valid PriceIncrease priceIncrease, BindingResult result)
{
    if (result.hasErrors())
    {
        return "priceincrease";
    }

    int increase = priceIncrease.getPercentage();
    logger.info("Increasing prices by " + increase + "%.");

    productManager.increasePrice(increase);

    return "redirect:/hello.htm";
}

ProductManager是一个由名为SimpleProductManager的类实现的服务。此类更新每个产品的价格，并尝试通过JpaProductDao将其保存到数据库。

这是我的applicationContext.xml：

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

    <!-- holding properties for database connectivity /-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- enabling annotation driven configuration /-->
    <context:annotation-config/>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name="driverClassName" value="${jdbc.driverClassName}"/>
      <property name="url" value="${jdbc.url}"/>
      <property name="username"  value="${jdbc.username}"/>
      <property name="password" value="${jdbc.password}"/>
    </bean>

    <bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
    p:dataSource-ref="dataSource"
    p:jpaVendorAdapter-ref="jpaAdapter">
    <property name="loadTimeWeaver">
            <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
    </property>                             
    <property name="persistenceUnitName" value="springappPU"></property>
    </bean>

    <bean id="jpaAdapter"
    class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
    p:database="${jpa.database}"
    p:showSql="${jpa.showSql}"/>

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

    <!-- <tx:annotation-driven transaction-manager="transactionManager"/>-->
    <tx:annotation-driven mode="aspectj" transaction-manager="transactionManager"/>

    <context:component-scan base-package="org.springtest.mavenspringapp">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    <!-- Scans the classpath of this application for @Components to deploy as beans 
    <context:component-scan base-package="org.springtest.mavenspringapp.repository" />
    <context:component-scan base-package="org.springtest.mavenspringapp.service" />
    <context:component-scan base-package="org.springtest.mavenspringapp.web" />-->

</beans>
顺便说一句，我添加了.flush方法调用，因为有人在这里建议（这是另一个关于不持续更改的问题）。

几乎忘了，如果.flush（）不包括产品没有更新而且不会抛出异常。这是休眠日志输出：

Hibernate: select product0_.id as id1_0_0_, product0_.description as descript2_0_0_, product0_.price as price3_0_0_ from products product0_ where product0_.id=?
Hibernate: select product0_.id as id1_0_0_, product0_.description as descript2_0_0_, product0_.price as price3_0_0_ from products product0_ where product0_.id=?
Hibernate: select product0_.id as id1_0_, product0_.description as descript2_0_, product0_.price as price3_0_ from products product0_

我希望你能帮助我。谢谢你提前。

编辑：我发布了我的web.xml文件内容：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/applicationContext.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <display-name>Mavenspringapp</display-name>

    <servlet>
        <servlet-name>mavenspringapp</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/spring/app-config.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>mavenspringapp</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>
</web-app>

应用-config.xml中

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/mvc 
                        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="messages"/>
    </bean>

    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="org.springtest.mavenspringapp" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>


    <!-- Configures the @Controller programming model -->
    <mvc:annotation-driven/>
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView">
        </property>
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

3 个答案:

答案 0 :(得分：1)

您没有进行交易，因为例外建议：javax.persistence.TransactionRequiredException: no transaction is in progress

您需要一个总体事务，因为您传递给saveProduct方法的对象已被分离（它不再由实体管理器管理）。

使用@Transactional注释您的控制器，您应该很好。请记住，在您获取对象后，仍需要对其进行管理才能更新它们。同时在获取对象时删除readOnly = true。此外，您实际上并不需要在存储库中使用@Transactional注释，因为在所有情况下我都会想到您需要一个总体事务，并且您不需要事务来从数据源读取。

答案 1 :(得分：1)

从堆栈跟踪判断，您正在加载两次bean，一次是ContextLoaderListener，它已经定义了正确的事务。一旦进入DispatcherServlet没有交易。 （你的堆栈跟踪没有显示TransactionInterceptor，这让我相信这一点。）

确保您不扫描两次相同的组件（不要复制两个配置文件中的<context:component-scan />元素。

问题是 app-config.xml

中的以下行 
<context:component-scan base-package="org.springtest.mavenspringapp" />

此再次会创建所有bean的新实例，并且不会向其应用事务。 AOP仅应用于定义bean的相同应用程序上下文中。因此，基本上您有JPAProductDao个实例（对于那些无用的实例）有2个实例与事务以及ApplicationContext中未应用的实例您ContextLoaderListener加载的ApplicationContext中的DispatcherServlet和另一个（未应用任何交易）。

修改组件 - 将 applicationContext.xml 扫描到以下

<context:component-scan base-package="org.springtest.mavenspringapp">
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>

并在你的app-config.xml中提供以下内容（注意：不要忘记use-default-filters属性!!!!）

<context:component-scan base-package="org.springtest.mavenspringapp" use-default-filters="false">
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
</context:component-scan>

您还可以删除使用<context:annotation-config />已隐含的<context:component-scan />。为您保存另一行xml。

答案 2 :(得分：0)

尝试：

@Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)

documentation here

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