在应用中，需要热切换数据源。但发现如下问题：

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应用服务器 Java Hibernate Bean XML

在应用中，需要热切换数据源。但发现如下问题：

错误

Java代码

   1. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'swappable' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is null
   2. java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'swappable' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception is null
java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given

配置如下

Java代码

   1. <bean id="myDataSource1" class="org.springframework.jndi.JndiObjectFactoryBean">
   2.     <property name="jndiName">
   3.         <value>java:/ds1</value>
   4.     </property>
   5. </bean>
   6.
   7. <bean id="myDataSource2" class="org.springframework.jndi.JndiObjectFactoryBean">
   8.     <property name="jndiName">
   9.         <value>java:/ds2</value>
10.     </property>
11. </bean>
12.
13.
14. <bean id="myTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
15.
16.     <property name="userTransactionName">
17.         <value>UserTransaction</value>
18.     </property>
19.
20.     <property name="transactionManagerName">
21.         <value>java:/TransactionManager</value>
22.     </property>
23.
24. </bean>
25.
26. <bean id="swappableDataSource"
27.       class="org.springframework.aop.target.HotSwappableTargetSource">
28.     <constructor-arg>
29.         <ref local="myDataSource1"/>
30.     </constructor-arg>
31. </bean>
32.
33. <bean id="swappable"
34.       class="org.springframework.aop.framework.ProxyFactoryBean">
35.     <property name="targetSource">
36.         <ref local="swappableDataSource"/>
37.     </property>
38. </bean>
39. <bean id="mySessionFactory1" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
40.     <property name="mappingResources">
41.         <list>
42.             <value>test/po/impl/Cus.hbm.xml</value>
43.         </list>
44.     </property>
45.     <property name="hibernateProperties">
46.         <props>
47.             <prop key="hibernate.dialect"> ${hibernate.dialect} </prop>
48.             <prop key="hibernate.show_sql">true</prop>
49.             <prop key="hibernate.generate_statistics">true</prop>
50.             <prop key="hibernate.cache.provider_class">
51.             org.hibernate.cache.EhCacheProvider</prop>
52.         </props>
53.     </property>
54.     <property name="dataSource">
55.         <ref local="swappable"/>
56.     </property>
57. </bean>

    <bean id="myDataSource1" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName">
            <value>java:/ds1</value>
        </property>
    </bean>

    <bean id="myDataSource2" class="org.springframework.jndi.JndiObjectFactoryBean">
        <property name="jndiName">
            <value>java:/ds2</value>
        </property>
    </bean>


    <bean id="myTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">

        <property name="userTransactionName">
            <value>UserTransaction</value>
        </property>

        <property name="transactionManagerName">
            <value>java:/TransactionManager</value>
        </property>

    </bean>

    <bean id="swappableDataSource"
          class="org.springframework.aop.target.HotSwappableTargetSource">
        <constructor-arg>
            <ref local="myDataSource1"/>
        </constructor-arg>
    </bean>

    <bean id="swappable"
          class="org.springframework.aop.framework.ProxyFactoryBean">
        <property name="targetSource">
            <ref local="swappableDataSource"/>
        </property>
    </bean>
    <bean id="mySessionFactory1" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="mappingResources">
            <list>
                <value>test/po/impl/Cus.hbm.xml</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect"> ${hibernate.dialect} </prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.generate_statistics">true</prop>
                <prop key="hibernate.cache.provider_class">
                org.hibernate.cache.EhCacheProvider</prop>
            </props>
        </property>
        <property name="dataSource">
            <ref local="swappable"/>
        </property>
    </bean>

这里的数据源是用应用服务器JNDI提供的，如果用自己的就没有问题。

Java代码

   1. <bean id="dataSource1" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   2.     <property name="driverClassName" value="${jdbc.driverClassName}"/>
   3.     <property name="url" value="${jdbc.url1}"/>
   4.     <property name="username" value="${jdbc.username}"/>
   5.     <property name="password" value="${jdbc.password}"/>
   6. </bean>

    <bean id="dataSource1" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url1}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

用应用服务器的JNDI就会出现上面的错误。请指教。谢谢。

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