I would like to know how to enable fine grained trace for c3p0 in log4j.xml.

I have the following entry in log4j.xml:

<logger name="com.mchange.v2.c3p0.impl">
<level value="debug"/>
<appender-ref ref="c3p0"/>
</logger>

However,I find only prints like the following throughout the log file which gets generated for this logger:

[19 Jul 2010 19:57:38:686] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@1a11e65: close() called more than once.
[19 Jul 2010 19:57:38:741] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@ca4dc1: close() called more than once.
[19 Jul 2010 19:57:38:747] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@10e2d89: close() called more than once.
[19 Jul 2010 19:57:38:755] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@ef70f8: close() called more than once.
[19 Jul 2010 19:57:38:810] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@54f902: close() called more than once.
[19 Jul 2010 19:57:38:866] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@193e364: close() called more than once.
[19 Jul 2010 19:57:38:921] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@2cf4c7: close() called more than once.
[19 Jul 2010 19:57:38:928] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@cd2124: close() called more than once.
[19 Jul 2010 19:57:38:934] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@9d1478: close() called more than once.
[19 Jul 2010 19:57:38:939] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@f67046: close() called more than once.
[19 Jul 2010 19:57:38:946] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@adf0e8: close() called more than once.
[19 Jul 2010 19:57:38:951] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@8f609a: close() called more than once.
[19 Jul 2010 19:57:38:957] impl.NewProxyPreparedStatement: com.mchange.v2.c3p0.impl.NewProxyPreparedStatement@a146d0: close() called more than once.
@

Somehow, I do not see any exception trace related to the issue. Can someone suggest how to enable fine trace for this?