Question

我在applicationContext.xml文件（Spring 3）中使用了以下语句。

<bean name="loggingAutoProxy"
      class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">

在这个applicationContext文件中，当我尝试为bean属性名称和引用指定一个不同的名称时，它返回null对象。但是，如果我给名称和引用赋予相同的值，它正常工作/正确返回bean引用。这个问题是因为org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator吗？如果是，如何解决此问题？

这不起作用（在我的java代码中将bean引用返回为null）：

<bean id="cacheDelegate" class="com.srsa.wiradmin.delegate.CacheDelegate" > 
<property name="statusDBDAO"><ref bean="BMOStatusDBDAO" /></property> 
</bean> 

 <bean id="BMOStatusDBDAO" class="com.srsa.wiradmin.dao.StatusDBDAO">
        <property name="dataSource">
            <ref bean="BMOAdminDataSource" />
        </property>
</bean>
    <bean id="BMOAdminDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" 
                    destroy-method="close" lazy-init="default" autowire="default" dependency-check="default">
            <property name="driverClass" value="${jdbc.driver}" ></property>
            <property name="jdbcUrl" value="${admin.jdbc.url}" ></property>
            <property name="user" value="${admin.jdbc.user}" ></property>
            <property name="password" value="${admin.jdbc.password}" ></property>
            <property name="initialPoolSize" value="3" ></property>
            <property name="minPoolSize" value="3" ></property>
            <property name="maxPoolSize" value="25" ></property>
            <property name="acquireIncrement" value="1" ></property>
            <property name="acquireRetryDelay" value="1000" ></property>
            <property name="debugUnreturnedConnectionStackTraces" value="true" ></property>
            <property name="maxIdleTime" value="300" ></property>
            <property name="unreturnedConnectionTimeout" value="300000" ></property>
            <property name="preferredTestQuery" value="SELECT COUNT(*) FROM LOCALE_CODE" ></property>
            <property name="checkoutTimeout" value="300000" ></property>
            <property name="idleConnectionTestPeriod" value="600000" ></property>
</bean>

这有效（正确返回对象）：

<bean id="cacheDelegate" class="com.srsa.wiradmin.delegate.CacheDelegate" > 
<property name="statusDBDAO"><ref bean="statusDBDAO" /></property> 
</bean> 

 <bean id="statusDBDAO" class="com.srsa.wiradmin.dao.StatusDBDAO">
        <property name="dataSource">
            <ref bean="BMOAdminDataSource" />
        </property>
</bean>

    <bean id="BMOAdminDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" 
                    destroy-method="close" lazy-init="default" autowire="default" dependency-check="default">
            <property name="driverClass" value="${jdbc.driver}" ></property>
            <property name="jdbcUrl" value="${admin.jdbc.url}" ></property>
            <property name="user" value="${admin.jdbc.user}" ></property>
            <property name="password" value="${admin.jdbc.password}" ></property>
            <property name="initialPoolSize" value="3" ></property>
            <property name="minPoolSize" value="3" ></property>
            <property name="maxPoolSize" value="25" ></property>
            <property name="acquireIncrement" value="1" ></property>
            <property name="acquireRetryDelay" value="1000" ></property>
            <property name="debugUnreturnedConnectionStackTraces" value="true" ></property>
            <property name="maxIdleTime" value="300" ></property>
            <property name="unreturnedConnectionTimeout" value="300000" ></property>
            <property name="preferredTestQuery" value="SELECT COUNT(*) FROM LOCALE_CODE" ></property>
            <property name="checkoutTimeout" value="300000" ></property>
            <property name="idleConnectionTestPeriod" value="600000" ></property>
</bean>

...再见

Answer 1

您的cacheDelegate bean正在查找引用ID statusDBDAO的bean，但DAO上的ID实际上是BMOStatusDBDAO。

空指针异常 - 春天3

1 个答案: