spring - 创建 ServletContext 资源中定义的名称为“dataSource”的 bean 时出错

Question

我正在使用 struts2 演示项目和 spring 来管理 Hibernate 会话。

我正在关注这篇文章http://www.splinter.com.au/using-spring-to-manage-hibernate-sessions-in/

错误

  SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is java.lang.NoSuchFieldError: NULL
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:609)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NoSuchFieldError: NULL
    at org.springframework.expression.TypedValue.<clinit>(TypedValue.java:32)
    at org.springframework.expression.spel.support.StandardEvaluationContext.setRootObject(StandardEvaluationContext.java:85)
    at org.springframework.expression.spel.support.StandardEvaluationContext.<init>(StandardEvaluationContext.java:74)
    at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:124)
    at org.springframework.beans.factory.support.AbstractBeanFactory.evaluateBeanDefinitionString(AbstractBeanFactory.java:1299)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.evaluate(BeanDefinitionValueResolver.java:210)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:182)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1360)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1118)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    ... 21 more
Sep 24, 2012 7:22:18 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Sep 24, 2012 7:22:18 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/1-Struts2_CRUD] startup failed due to previous errors
Sep 24, 2012 7:22:18 AM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext
Sep 24, 2012 7:22:18 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/1-Struts2_CRUD] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Sep 24, 2012 7:22:18 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/1-Struts2_CRUD] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak.

应用程序上下文.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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- enable annotation beans definitions -->
    <context:component-scan base-package="com.pirzada"/>

    <!-- Basic DataSource Configuration -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/struts2_demo_db"/>
        <property name="username" value="root"/>
        <property name="password" value="786"/>
    </bean>


    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>

        <property name="packagesToScan">
            <list>
                <value>com.pirzada.dao</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
                <prop key="hibernate.connection.useUnicode">true</prop>
                <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
                <prop key="hibernate.max_fetch_depth">0</prop>
                <prop key="hibernate.jdbc.use_scrollable_resultset">true</prop>
            </props>
        </property>
    </bean>

    <!-- defining transaction manager bean using Hibernate -->
    <bean id="txManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>

    <!-- enable the configuration of transactional behavior based on annotations -->
    <tx:annotation-driven transaction-manager="txManager"/>

    <!-- &lt;!&ndash; exception translation bean post processor &ndash;&gt;
   <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
   <bean class="org.springframework.orm.hibernate4.HibernateExceptionTranslator"/>-->

    <!--  DAO beans -->
    <!--
    <bean id="userDAO"  class="org.droidaceapps.dao.UserDAOImpl">
        <property name="hibernateTemplate" ref="hibernateTemplate" />
    </bean>

    &lt;!&ndash;  Service beans &ndash;&gt;

    <bean id="userService"  class="org.droidaceapps.services.UserServiceImpl">
        <property name="userDAO" ref="userDAO" />
    </bean>-->

</beans>

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

  <display-name>Archetype Created Web Application</display-name>

    <!--<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>-->


    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>
            org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
        </filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- Spring -->
    <listener> <!-- Required for the struts2 spring plugin to work -->
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <filter> <!-- Get spring to keep the session open for the whole request, so hibernate's lazy loads work -->
        <filter-name>openSessionInViewFilter</filter-name>
        <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
        <init-param>
            <param-name>sessionFactoryBeanName</param-name>
            <param-value>sessionFactory</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>openSessionInViewFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>


    <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
    </welcome-file-list>

</web-app>

休眠.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/struts2_demo_db</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">786</property>
        <property name="hibernate.connection.pool_size">1</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <!-- Echo all executed SQL to stdout for debugging -->
        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">update</property>


        <property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>
        <property name="hibernate.c3p0.max_size">100</property>
        <property name="hibernate.c3p0.min_size">1</property>
        <property name="hibernate.c3p0.idle_test_period">30</property>

        <mapping class="com.pirzada.domain.User"/>
        <!-- DB schema will be updated if needed -->
        <!-- <property name="hbm2ddl.auto">update</property> -->
    </session-factory>
</hibernate-configuration>

用户DAOImpl

/*@Transactional is needed so that a Hibernate transaction is set up, otherwise updates won't have an affect*/
@Transactional
public class UserDAOImpl implements UserDAO {

    // So Spring can inject the session factory
    protected SessionFactory sessionFactory;
    public void setSessionFactory(SessionFactory value) {
        sessionFactory = value;
    }

    // Shortcut for sessionFactory.getCurrentSession()
    protected Session session() {
        return sessionFactory.getCurrentSession();
    }

    @Override
    public void saveOrUpdateUser(User user) {
        session().saveOrUpdate(user);
    }
}

行家

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
        </dependency>

        <!-- javaee-api 6 dependencies -->
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>

        <!-- Spring framework dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>3.1.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-spring-plugin</artifactId>
            <version>2.3.4.1</version>
        </dependency>

        <!-- struts2 dependencies -->
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>2.3.4.1</version>
        </dependency>

        <!-- sl4j dependencies -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>

        <!-- Hibernate dependencies -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.core.version}</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.3.0.Final</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-c3p0</artifactId>
            <version>${hibernate.core.version}</version>
        </dependency>

        <!-- JDBC dependencies -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>

    </dependencies>

score 3 · Accepted Answer

这似乎是类路径中 JAR 文件版本不兼容的问题，例如 Spring 可能需要一些更低或更高版本的 hibernate。hibernate.core.version- 这会很有用。尝试改用 Hibernate3，我敢打赌这是 Hibernate4 及其 Spring 支持的问题。

score 1 · Accepted Answer

我无法提供解决方案，但由于我没有足够的积分，因此无法发表评论，因此我可以向您提供我所获得的信息，希望您也能够找到解决方案。

当我尝试运行示例项目时，我遇到了同样的错误。我正在运行 Hibernate 3.2.0.ga、Maven 2、Spring 3.2.0 和 Tomcat 7。我得到了确切的错误。我下载了源文件，暂停并在调试时运行 Tomcat。据我所知。尝试获取注册范围时出现错误。Beans 传入的是“单例”，当它查找该范围时，它返回 null 并且我得到了您描述的错误。

为了理智，我在我所有的 bean 中添加了“会话”，但我得到了一个不同的错误

java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.
    at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131)
    ...

我希望这可能会让你走上解决这个问题的正确轨道，因为我也很想找到解决方案。设置项目和项目基础设施是我的弱点，所以这对我来说总是一个头疼的问题。

编辑：果然，很可能是库版本冲突。在我的项目中，当我遇到错误时，我最初尝试使用最新的 Spring 和 Hibernate 3。我用 Google 和 Google 搜索找出哪些版本相互兼容，并在 Hibernate 论坛上发现了一条旧评论，显示 Spring 3.0.0.RELEASE 将与 Hibernate 3.4.0.GA 一起使用。我计划更新每一个，直到我可以得到这两个工具的最新兼容版本。

SO评论上有人说过

只需使用这些库，直到找到一些兼容的库。这不是成为开发人员的乐趣之一吗？

...我当然希望那家伙是在开玩笑。

score 1 · Accepted Answer

您应该将 mysql-connector-java-5.1.26-bin.jar 添加到 WEB-INF/lib 中。我遇到了像你这样的问题。它会工作的。

spring - 创建 ServletContext 资源中定义的名称为“dataSource”的 bean 时出错

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