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I always forget which level is which in Log4j so I copied this from the JavaDoc for the Level class.

Edit the log4j.xml in the conf directory as shown below to turn on SQL debugging of the JDBC CMP plugin.

/apps/jboss/server/default/conf :->diff -c log4j.xml~ log4j.xml
*** log4j.xml~  Mon Sep 30 18:09:27 2002
--- log4j.xml   Tue Apr  4 20:41:18 2006
***************
*** 61,73 ****
    <!-- ============================== -->

    <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
!     <param name="Threshold" value="INFO"/>
      <param name="Target" value="System.out"/>

      <layout class="org.apache.log4j.PatternLayout">
        <!-- The default pattern: Date Priority [Category] Message\\n -->
        <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>

      </layout>
    </appender>

--- 61,79 ----
    <!-- ============================== -->

    <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
!     <!--<param name="Threshold" value="INFO"/>-->
!     <param name="Threshold" value="DEBUG"/>
      <param name="Target" value="System.out"/>

      <layout class="org.apache.log4j.PatternLayout">
        <!-- The default pattern: Date Priority [Category] Message\\n -->
        <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>

      </layout>
+
+     <category name="org.jboss.ejb.plugins.cmp.jdbc">
+       <priority value="DEBUG"/>
+     </category>
+
    </appender>

If you want to log Hibernate SQL statements:

    <category name="org.hibernate.SQL">
      <priority value="DEBUG"/>
    </category>

If you want to log everything Hibernate’s doing, including SQL statements, schema export, transactions, etc.:

    <category name="org.hibernate.SQL">
      <priority value="DEBUG"/>
    </category>