title: ignoreUnresolvablePlaceholders not working
body: <p>I am using ignoreUnresolvablePlaceholders in my spring context.
  as below.</p>
  
  <pre><code>&lt;bean
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"&gt;
          &lt;property name="locations"&gt;
              &lt;list&gt;
                  &lt;value&gt;classpath:messaging.properties&lt;/value&gt;
              &lt;/list&gt;
          &lt;/property&gt;
          &lt;property name="ignoreResourceNotFound" value="false" /&gt;
          &lt;property name="ignoreUnresolvablePlaceholders" value="true" /&gt;
      &lt;/bean&gt;
  </code></pre>
  
  <p>event setting ignoreUnresolvablePlaceholders to true its not ignoring my spring bean being injecting.
  i am passing amq.topic=  in property file for </p>
  
  <pre><code>&lt;bean id="messageTopic1" class="org.apache.activemq.command.ActiveMQTopic"&gt;
          &lt;constructor-arg value="${amq.topic}" /&gt;
  &lt;/bean&gt;
  </code></pre>
  
  <p>But its not ignoring this bean for being injecting.</p>
  
  <p>below is my Spring-context.xml amd property file.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;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.xsd
              http://www.springframework.org/schema/context
              http://www.springframework.org/schema/context/spring-context-3.1.xsd"&gt;
  
      &lt;bean
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"&gt;
          &lt;property name="locations"&gt;
              &lt;list&gt;
                  &lt;value&gt;classpath:messaging.properties&lt;/value&gt;
              &lt;/list&gt;
          &lt;/property&gt;
          &lt;property name="ignoreResourceNotFound" value="false" /&gt;
          &lt;property name="ignoreUnresolvablePlaceholders" value="true" /&gt;
      &lt;/bean&gt;
  
  
      &lt;!-- Active MQ Broker Configuration Details --&gt;
  
      &lt;bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory"&gt;
          &lt;property name="brokerURL" value="${amq.url}" /&gt;
      &lt;/bean&gt;
  
      &lt;bean id="messageQueue1" class="org.apache.activemq.command.ActiveMQQueue"&gt;
          &lt;constructor-arg value="${amq.queue}" /&gt;
      &lt;/bean&gt;
  
      &lt;bean id="messageTopic1" class="org.apache.activemq.command.ActiveMQTopic"&gt;
          &lt;constructor-arg value="${amq.topic}" /&gt;
      &lt;/bean&gt;
  
      &lt;bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate"&gt;
          &lt;property name="connectionFactory" ref="connectionFactory" /&gt;
      &lt;/bean&gt;
  
      &lt;bean id="activeMQ" class="com.isc.common.messaging.AmqUtilityHelper"&gt;
          &lt;property name="destination" ref="messageQueue1" /&gt;
          &lt;property name="jmsTemplate" ref="jmsTemplate" /&gt;
      &lt;/bean&gt;
  
      &lt;!-- &lt;bean id="activeMQ1" class="com.isc.common.messaging.AmqUtilityHelper"&gt;
          &lt;property name="destination" ref="messageTopic1" /&gt;
          &lt;property name="jmsTemplate" ref="jmsTemplate" /&gt;
      &lt;/bean&gt; --&gt;
  
      &lt;bean id="messageBroker" class="com.isc.common.messaging.AmqUtilityHelper"&gt;
          &lt;property name="activeBroker" value="${active.broker}" /&gt;
      &lt;/bean&gt;
  
  &lt;/beans&gt;
  </code></pre>
  
  <p>And Below is the property file that i am loading.</p>
  
  <pre><code>#AMQ/Solace properties production:
  # uncomment the borker to use
  active.broker=activeMQ
  #active.broker=solace
  #active.broker=activeMQ
  
  
  
  #AMQ Broker Properties
  amq.url=failover:(tcp://localhost:61616)??initialReconnectDelay=2000&amp;maxReconnectAttempts=5
  amq.queue=messageQueue1
  amq.topic=
  
  
  #Solace Broker Properties
  solace.url=smf://192.168.56.101:55555
  solace.userName=spring_user@Solace_Spring_VPN
  solace.passWord=spring_password
  solace.jndiName=JNDI/CF/spring1
  solace.queue=JNDI/Q/requests
  #solace.topic=JNDI/topic1
  </code></pre>