[英]Null Pointer Exception - spring 3
我在applicationContext.xml
文件(春季3)中使用以下语句。
<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其他名称时,它返回空对象。 但是,如果我为名称和引用提供相同的值,则它工作正常/正确返回了bean引用。 这是因为org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator
吗? 是,如何解决?
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...
您的cacheDelegate
bean正在查找一个引用到ID statusDBDAO
的bean,但DAO上的ID实际上是BMOStatusDBDAO
。
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