title: spring mvc 3- context:property-placeholder is not bound
body: <p>I'm working with spring 3.0.5 and trying to read a configuration file through the context element:</p>
  
  <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
  xmlns:aop="http://www.springframework.org/schema/aop"
  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
      http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
      http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"&gt;
  
  &lt;context:property-placeholder location="classpath:db_config.properties"/&gt;
  </code></pre>
  
  <p>When the application starts up, I get the following error:</p>
  
  <blockquote>
    <p>Offending resource: ServletContext resource [/WEB-INF/spring/applicationContext.xml]; nested exception is org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 20 in XML document from ServletContext resource [/WEB-INF/spring/db-config.xml] is invalid; nested exception is org.xml.sax.SAXParseException: The prefix "context" for element "context:property-placeholder" is not bound.</p>
  </blockquote>
  
  <p>What am I doing wrong?</p>