Jun 04 2009

Spring logging config

Published by Gilles under J2EE, Java, Spring

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Spring uses Apache commons-logging as a bridge between different logging implementations.
This way you can change from a logging framework to any other supported loggin mechanism at any time.

The org.springframework.beans.factory.config.CommonsLogFactoryBean will create a "logger bean" and his type will depends on your configuration.

Example for the implementation:

In your application context, add a CommonsLogFactoryBean and give it a logName.

PLAIN TEXT
XML:
  1. <bean id="logger" class="org.springframework.beans.factory.config.CommonsLogFactoryBean">
  2.  
  3. <property name="logName" value="log"/></bean>

In your web., add the org.springframework.web.util.Log4jConfigListener listener before the
org.springframework.web.context.ContextLoaderListener

PLAIN TEXT
XML:
  1. <context-param>
  2. <param-name>log4jConfigLocation</param-name>
  3. <param-value>WEB-INF/.properties</param-value>
  4. </context-param>
  5. <listener>
  6. <listener->org.springframework.web.util.Log4jConfigListener</listener->
  7. </listener>

Here, my log4j config is locatedin the WEB-INF/.properties and here is its content:

PLAIN TEXT
XML:
  1. log4j.rootCategory=DEBUG, CONSOLE# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
  2. log4j.appender.CONSOLE=org.apache..ConsoleAppender
  3. log4j.appender.CONSOLE.Threshold=DEBUG
  4. log4j.appender.CONSOLE.layout=org.apache..PatternLayout
  5. log4j.appender.CONSOLE.layout.ConversionPattern=- %m%n
  6. log4j.category.net.sf.hibernate=DEBUG
  7. log4j.category.org.springframework =DEBUG

To make use of your logger in your other beans, add a member variable of type org.apache.commons.logging.Log
and configure to inject the reference to the logger bean. For my part, I choose to do it through annotations because I don't want to have to make this reference in all my beans...
So, in your application context, add the

PLAIN TEXT
XML:
  1. <context:annotation-config/>

tag to enable the annotations config.In the targets beans, annotate the member variable as follow:

PLAIN TEXT
JAVA:
  1. @Autowired @Qualifier("logger")
  2. private final Log logger = null;

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