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   <title>4.&nbsp; Log4J</title><link rel="stylesheet" href="css/docbook.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.72.0"><link rel="start" href="manual.html" title="Apache OpenJPA User's Guide"><link rel="up" href="ref_guide_logging.html" title="Chapter&nbsp;3.&nbsp; Logging"><link rel="prev" href="ref_guide_logging_noop.html" title="3.&nbsp; Disabling Logging"><link rel="next" href="ref_guide_logging_commons.html" title="5.&nbsp; Apache Commons Logging"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">4.&nbsp;
            Log4J
        </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ref_guide_logging_noop.html">Prev</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;3.&nbsp;
        Logging
    </th><td width="20%" align="right">&nbsp;<a accesskey="n" href="ref_guide_logging_commons.html">Next</a></td></tr></table><hr></div><div class="section" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="ref_guide_logging_log4j"></a>4.&nbsp;
            Log4J
        </h2></div></div></div><a class="indexterm" name="d0e16892"></a><p>
When <code class="literal">openjpa.Log</code> is set to <code class="literal">log4j</code>, OpenJPA
will delegate to Log4J for logging. In a standalone application, Log4J logging
levels are controlled by a resource named <code class="filename">log4j.properties</code>
, which should be available as a top-level resource (either at the top level of
a jar file, or in the root of one of the <code class="literal">CLASSPATH</code>
directories). When deploying to a web or EJB application server, Log4J
configuration is often performed in a <code class="filename">log4j.xml</code> file
instead of a properties file. For further details on configuring Log4J, please
see the <a xmlns:xlink="http://www.w3.org/1999/xlink" href="http://jakarta.apache.org/log4j/docs/manual.html" target="_top">Log4J
Manual</a>. We present an example <code class="filename">log4j.properties</code> file
below.
        </p><div class="example"><a name="ref_guide_logging_log4j_ex"></a><p class="title"><b>Example&nbsp;3.4.&nbsp;
                Standard Log4J Logging
            </b></p><div class="example-contents"><pre class="programlisting">
log4j.rootCategory=WARN, console
log4j.category.openjpa.Tool=INFO
log4j.category.openjpa.Runtime=INFO
log4j.category.openjpa.Remote=WARN
log4j.category.openjpa.DataCache=WARN
log4j.category.openjpa.MetaData=WARN
log4j.category.openjpa.Enhance=WARN
log4j.category.openjpa.Query=WARN
log4j.category.openjpa.jdbc.SQL=WARN
log4j.category.openjpa.jdbc.JDBC=WARN
log4j.category.openjpa.jdbc.Schema=WARN

log4j.appender.console=org.apache.log4j.ConsoleAppender
</pre></div></div><br class="example-break"></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ref_guide_logging_noop.html">Prev</a>&nbsp;</td><td width="20%" align="center"><a accesskey="u" href="ref_guide_logging.html">Up</a></td><td width="40%" align="right">&nbsp;<a accesskey="n" href="ref_guide_logging_commons.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.&nbsp;
            Disabling Logging
        &nbsp;</td><td width="20%" align="center"><a accesskey="h" href="manual.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;5.&nbsp;
            Apache Commons Logging
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