applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.0.xsd">

  <context:annotation-config/>
  <context:property-placeholder/>
  
  <bean id="plainCallbackHandler" class="net.spy.memcached.auth.PlainCallbackHandler">
       <constructor-arg index="0" value="${MEMCACHE_USERNAME}"/>
       <constructor-arg index="1" value="${MEMCACHE_PASSWORD}"/> 
  </bean>
  
  <bean id="authDescriptor" class="net.spy.memcached.auth.AuthDescriptor">
       <constructor-arg index="0">
         <array><value>PLAIN</value></array>
       </constructor-arg>
       <constructor-arg index="1" ref="plainCallbackHandler"/> 
  </bean>
  
  <bean id="memcachedClient" class="net.spy.memcached.spring.MemcachedClientFactoryBean">
    <property name="servers" value="${MEMCACHE_SERVERS}:11211"/>
    <property name="protocol" value="BINARY"/>
    <property name="authDescriptor" ref="authDescriptor"/>
  </bean>

</beans>