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我正在编写一个 Spring/Hibernate 程序并从一个 Internet 示例开始。我复制了这个例子，解决了很多配置问题，并让首页正常工作。

我不喜欢我设置 web.xml 页面的方式。我想将 hibernate-context.xml 从 servlet 部分移动到较早的 context-param 部分。收集 XML 引用是我在其他网站上看到的一种模式。

这种改变对我不起作用。有人能告诉我为什么吗？我在下面包含了我的 XML 设置。

对于设置“B”，这里是启动日志：

[snip]
INFO : org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization started
INFO : org.springframework.web.context.support.XmlWebApplicationContext - Refreshing Root WebApplicationContext: startup date [Thu Jan 03 20:10:41 CST 2013]; root of context hierarchy
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/root-context.xml]
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/appServlet/hibernate-context.xml]
INFO : org.springframework.beans.factory.config.PropertyPlaceholderConfigurer - Loading properties file from ServletContext resource [/WEB-INF/spring/appServlet/spring.properties]
INFO : org.springframework.beans.factory.support.DefaultListableBeanFactory - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1b071c0: defining beans [org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,sessionFactory,dataSource,transactionManager]; root of factory hierarchy
[snip]

INFO : org.springframework.web.context.support.XmlWebApplicationContext - Refreshing WebApplicationContext for namespace 'appServlet-servlet': startup date [Thu Jan 03 20:10:44 CST 2013]; parent: Root WebApplicationContext
INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]
INFO : org.springframework.context.annotation.ClassPathBeanDefinitionScanner - JSR-330 'javax.inject.Named' annotation found and supported for component scanning
INFO : org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor - JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
[snip]

在“好”和“坏”设置中，Hibernate XML 都被加载。当然，“好”的设置会更快。

INFO : org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from ServletContext resource [/WEB-INF/spring/appServlet/hibernate-context.xml]
INFO : org.springframework.beans.factory.config.PropertyPlaceholderConfigurer - Loading properties file from ServletContext resource [/WEB-INF/spring/appServlet/spring.properties]

当我尝试使用“错误”设置的网页时，我得到了这个异常：

Jan 3, 2013 8:12:46 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/ticketexchange] threw exception [Request processing failed; nested exception is org.hibernate.HibernateException: No Session found for current thread] with root cause
org.hibernate.HibernateException: No Session found for current thread
    at org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:97)
    at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:941)
    at org.krams.tutorial.service.PersonService.getAll(PersonService.java:40)
    at org.krams.tutorial.controller.MainController.getRecords(MainController.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[snip]

有人可以解释一下吗？

这是我的配置文件：

网页.xml：

<?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"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/root-context.xml</param-value>    <!-- This setup "A" works -->
        <!-- <param-value>/WEB-INF/spring/root-context.xml /WEB-INF/spring/appServlet/hibernate-context.xml</param-value> -->       <!-- Once the commented sections are shifted, this setup "B" fails -->
    </context-param>

    <!-- Creates the Spring Container shared by all Servlets and Filters -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- Processes application requests -->
    <servlet>
        <servlet-name>appServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>WEB-INF/spring/appServlet/servlet-context.xml  /WEB-INF/spring/appServlet/hibernate-context.xml</param-value>    <!-- This setup "A" works -->
            <!-- <param-value>WEB-INF/spring/appServlet/servlet-context.xml</param-value> -->        <!-- Once the commented sections are shifted, this setup "B" fails -->
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>appServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

休眠上下文.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:p="http://www.springframework.org/schema/p"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="
   http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-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/context
   http://www.springframework.org/schema/context/spring-context-3.0.xsd
      ">

 <context:property-placeholder location="/WEB-INF/spring/appServlet/spring.properties" />

    <!-- Enable annotation style of managing transactions -->
 <tx:annotation-driven transaction-manager="transactionManager" />

    <!-- Declare the Hibernate SessionFactory for retrieving Hibernate sessions -->
    <!-- See http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/orm/hibernate4/annotation/AnnotationSessionFactoryBean.html -->       
 <!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/SessionFactory.html -->
 <!-- See http://docs.jboss.org/hibernate/stable/core/api/index.html?org/hibernate/Session.html -->
 <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"
     p:dataSource-ref="dataSource"
     p:configLocation="${hibernate.config}"
     p:packagesToScan="org.krams.tutorial"/>

 <!-- Declare a datasource that has pooling capabilities--> 
 <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    destroy-method="close"
    p:driverClass="${app.jdbc.driverClassName}"
    p:jdbcUrl="${app.jdbc.url}"
    p:user="${app.jdbc.username}"
    p:password="${app.jdbc.password}"
    p:acquireIncrement="5"
    p:idleConnectionTestPeriod="60"
    p:maxPoolSize="100"
    p:maxStatements="50"
    p:minPoolSize="10" />

 <!-- Declare a transaction manager-->
 <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"
          p:sessionFactory-ref="sessionFactory" />

</beans>

弹簧属性：

# database properties
app.jdbc.driverClassName=com.mysql.jdbc.Driver
app.jdbc.url=jdbc:mysql://localhost/my_database
app.jdbc.username=my_username
app.jdbc.password=my_password

#hibernate properties
hibernate.config=/WEB-INF/spring/appServlet/hibernate.cfg.xml

hibernate.cfg.xml，在 spring.properties 中声明：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
  <session-factory>
   <!-- We're using MySQL database so the dialect needs to MySQL as well-->
    <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
    <!-- Enable this to see the SQL statements in the logs-->
    <property name="show_sql">true</property>
    <!-- This will drop our existing database and re-create a new one.
      Existing data will be deleted! -->
    <!--<property name="hbm2ddl.auto">create</property>-->
  </session-factory>
</hibernate-configuration>

servlet-context.xml：

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

     <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
    <annotation-driven />

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix" value="/WEB-INF/views/" />
        <beans:property name="suffix" value=".jsp" />
    </beans:bean>

    <context:component-scan base-package="org.krams.tutorial" />



</beans:beans>

根上下文.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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- Root Context: defines shared resources visible to all other web components -->

</beans>
4

1 回答 1

1

这可能不是您问题的答案，但将其移至“context-param”部分的正确方法是将您的 hibernate-context.xml 加载到 root-context.xml 文件中。只需添加这一行

<import resource="hibernate-context.xml" /> //Assuming both are in the same folder

新 web.xml 的 servlet 部分将如下所示

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

你的 root-context.xml 将是

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

<!-- Root Context: defines shared resources visible to all other web components -->
<import resource="hibernate-context.xml" /> //Assuming both are in the same folder

</beans>

解决您的问题

分离你的组件扫描事务类和控制器。即在你的 servlet-context.xml

<context:component-scan base-package="org.krams.tutorial.yourControllerpackage" />

在你的 hibernate-context.xml

<context:component-scan base-package="org.krams.tutorial.yourDaoServicePackage" />

原因在这里解释

于 2013-01-04T02:56:37.823 回答