Configuring an ApplicationContextInitializer on Spring 3.1

MyAppCtxInitializer.java

public class MyAppCtxInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

    private static Logger LOG = LoggerFactory.getLogger(MyAppCtxInitializer.class);

    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        ConfigurableEnvironment environment = applicationContext.getEnvironment();
        try {
            environment.getPropertySources().addFirst(new ResourcePropertySource("classpath:env.properties"));
            LOG.info("env.properties loaded");
        } catch (IOException e) {
            // it's ok if the file is not there. we will just log that info.
            LOG.info("didn't find env.properties in classpath so not loading it in the AppContextInitialized");
        }
    }

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app ...>

	<context-param>
		<param-name>contextInitializerClasses</param-name>
		<param-value>somepackage.MyAppCtxInitializer</param-value>
	</context-param>

	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

</web-app>