Question

I have a bean which I use to load cache. I give the key for cache from Spring injection. I am duplicating the same bean just for the property and Spring is creating multiple instances of same bean. Is there anyway I can use one instance of the bean?

<aop:config>
    <aop:pointcut id="terminalPointcut"
        expression="execution(* *..TerminalDao.getTerminals())" />
    <aop:pointcut id="miscPointcut"
        expression="execution(* *..MiscDao.getMiscTableList(*))" />
    <aop:pointcut id="errorPointcut"
        expression="execution(* *..ErrorDao.getErrorList())" />
    <aop:advisor id="terminalCacheLoaderAdvisor"
        advice-ref="terminalCacheLoaderAdvice" pointcut-ref="terminalPointcut" />
    <aop:advisor id="miscCacheLoaderAdvisor"
        advice-ref="miscCacheLoaderAdvice" pointcut-ref="miscPointcut" />
    <aop:advisor id="errorCdDetailCacheLoaderAdvisor"
        advice-ref="errorCacheLoaderAdvice" pointcut-ref="errorPointcut" />
</aop:config>

<bean id="miscCacheLoaderAdvice" class="com.temp.ehCache.interceptor.CacheLoader">
        <property name="cacheManager" ref="simpleCacheManager" />   
        <property name="cache_data_key" value="MISC_DATA_KEY" />
</bean>

<bean id="errorCacheLoaderAdvice" class="com.temp.ehCache.interceptor.CacheLoader">
        <property name="cacheManager" ref="simpleCacheManager" />   
        <property name="cache_data_key" value="ERROR_DATA_KEY" />
</bean> 

Answer 1

<bean id="miscCacheLoaderAdvice" class="com.temp.ehCache.interceptor.CacheLoader">
        <property name="cacheManager" ref="simpleCacheManager" />   
        <property name="cache_data_key" value="MISC_DATA_KEY" />
</bean>

<bean id="errorCacheLoaderAdvice" class="com.temp.ehCache.interceptor.CacheLoader">
        <property name="cacheManager" ref="simpleCacheManager" />   
        <property name="cache_data_key" value="ERROR_DATA_KEY" />
</bean> 

You obviously need the same bean twice with two different configurations. So even if it were possible to combine it in one bean it would be a total pain (You could e.g. use ThreadLocals to set the property as needed etc.)

I’d say change your design. If com.temp.ehCache.interceptor.CacheLoader is heavy, try to extract the heavy stuff to a delegate bean that can be used by the CacheLoader beans. Keep the CacheLoader beans as small as possible, and it won’t be a problem to have more than one of them around (as long as you don’t use autowiring by type).