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POBaffled by Java Logging Systems with Spring and Hibernate
 

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    <p>WHen deploying my Spring / Hibernate application, I get the following warning related to logging:</p> <pre><code>log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader). log4j:WARN Please initialize the log4j system properly. </code></pre> <p>Surprising to me was the lack of information from a Google / SO search. The only thing relevant was this SO post <a href="https://stackoverflow.com/questions/217929/problem-with-commons-logging-log4j-setup-in-spring-webapp-with-tomcat-6">Problem with Commons Logging / Log4j setup in spring webapp with tomcat 6</a></p> <p>However, this is even beyond me. Can somebody clarify the logging systems in play here, or point me to a RECENT resource on the matter (there are some ancient google search results that don't really apply). Specifically, the issues I'm wrestling with are:</p> <ul> <li><p>The distinction among commons-logging, log4j, slf4j and JCL. My understanding is that slf4j is a wrapper, while commons-logging and log4j are actual implementations. I don't know where JCL fits in. </p></li> <li><p>How to configure logging for Spring. What does in the web.xml file, do i need a log4j.properties file or a log4j.xml file? Where does it go, in WEB-INF? Does anything go in my applicationContext.xml file? (sorry but I need to start from zero here). </p></li> <li><p>I am using Hibernate in my project and including via Maven. It seems that Hibernate uses slf4j-simple. I have seen warnings saying that I can't have slf4j-simple and slf4j-log4j both on the classpath. I have not included slf4j-log4j as a dependency, but Hibernate must be including it. How do i solve this problem? Can I force Hibernate to use log4j instead?</p></li> </ul> <p>Any help would be greatly appreciated. Thanks. </p> <p><hr /> edit:</p> <p>Thanks for all the answers so far. I am giving these suggestions a try. What about spring web-app specifically? I've seen examples of listeners and parameters and whatnot put into the web.xml file. Is this also required?</p>
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