昨天收到一个xmc的issue报告，大概的意思是将Xmemcached与spring 2.5集成没有任何问题，但是将spring升级到3.0就会抛出一个异常，并且spring容器无法正常启动，异常信息类似“Couldn't find a destroy method named 'shutdown' on bean XMemcachedClientFactoryBean”。更详细的情况可以看这里，这是这位朋友分析的结果，简单来说就是spring 3.0对于查找destroy method为空的情况处理不同了，过去是打个日志，现在是抛出一个异常。
问题说完，这里主要是介绍下这个问题的解决方式，事实上Xmemcached有一个没有被文档化的Spring配置方式，没有写入文档的主要考虑是以为wiki介绍的第一种方式已经足够，而builder的方式相对繁琐一些。通过XmemcachedClientBuilder的这个factory bean的factory-method，也就是build方法来构建MemcachedClient，这就可以绕开spring 3.0的这个问题。一个示范配置如下：
<bean name="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<constructor-arg>
<list>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>localhost</value>
</constructor-arg>
<constructor-arg>
<value>12000</value>
</constructor-arg>
</bean>
</list>
</constructor-arg>
</bean>
<bean name="memcachedClient" factory-bean="memcachedClientBuilder"
factory-method="build" destroy-method="shutdown" />
memcachedClientBuilder作为一个factory-bean，接受一个InetSocketAddress列表作为构造函数传入，最后MemcachedClient就可以通过factory-method——也就是build方法创建了。
多个节点情况下，可能你想设置权重，那么传入memcachedClientBuilder的第二个构造函数参数权重数组即可：
<bean name="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<constructor-arg>
<list>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>localhost</value>
</constructor-arg>
<constructor-arg>
<value>12000</value>
</constructor-arg>
</bean>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>localhost</value>
</constructor-arg>
<constructor-arg>
<value>12001</value>
</constructor-arg>
</bean>
</list>
</constructor-arg>
<constructor-arg>
<list>
<value>1</value>
<value>2</value>
</list>
</constructor-arg>
</bean>
<bean name="memcachedClient" factory-bean="memcachedClientBuilder"
factory-method="build" destroy-method="shutdown" />
上面的例子将localhost:12000的权重设置为1，而localhost:12001的权重设置为2。除了这些配置外，XmemcachedClientBuilder还有其他选项，如配置一致性哈希算法、连接池等，完整的配置例子如下：
<bean name="memcachedClientBuilder" class="net.rubyeye.xmemcached.XMemcachedClientBuilder">
<!-- XMemcachedClientBuilder have two arguments.First is server list,and second is weights array. -->
<constructor-arg>
<list>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>localhost</value>
</constructor-arg>
<constructor-arg>
<value>12000</value>
</constructor-arg>
</bean>
<bean class="java.net.InetSocketAddress">
<constructor-arg>
<value>localhost</value>
</constructor-arg>
<constructor-arg>
<value>12001</value>
</constructor-arg>
</bean>
</list>
</constructor-arg>
<constructor-arg>
<list>
<value>1</value>
<value>2</value>
</list>
</constructor-arg>
<property name="connectionPoolSize" value="2"></property>
<property name="commandFactory">
<bean class="net.rubyeye.xmemcached.command.TextCommandFactory"></bean>
</property>
<property name="sessionLocator">
<bean class="net.rubyeye.xmemcached.impl.KetamaMemcachedSessionLocator"></bean>
</property>
<property name="transcoder">
<bean class="net.rubyeye.xmemcached.transcoders.SerializingTranscoder" />
</property>
</bean>
<!-- Use factory bean to build memcached client -->
<bean name="memcachedClient" factory-bean="memcachedClientBuilder"
factory-method="build" destroy-method="shutdown"/>
文章转自庄周梦蝶 ，原文发布时间 2009-12-24