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copied!<p>You can use log4j to output debug information like so:</p> <pre><code>log4j.logger.com.mchange=DEBUG, STDOUT ### direct log messages to stdout ### log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender log4j.appender.STDOUT.Target=System.out log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout log4j.appender.STDOUT.layout.ConversionPattern=%t %d{dd/MMM/yyyy:H:mm:ssZ} %5p %c{1}:%L - %m%n </code></pre> <p>If you put the above in a file called <code>log4j.properties</code> and put that file in your classpath you should get tons of debug output from c3p0.</p> <p>Example output:</p> <pre><code>main 14/Dec/2009:13:24:49-0500 DEBUG BasicResourcePool:289 - com.mchange.v2.resourcepool.BasicResourcePool@16c06dd config: [start -> 0; min -> 0; max -> 5; inc -> 1; num_acq_attempts -> 30; acq_attempt_delay -> 1000; check_idle_resources_delay -> 300000; mox_resource_age -> 0; max_idle_time -> 100000; excess_max_idle_time -> 0; destroy_unreturned_resc_time -> 0; expiration_enforcement_delay -> 25000; break_on_acquisition_failure -> false; debug_store_checkout_exceptions -> false] main 14/Dec/2009:13:24:49-0500 DEBUG BasicResourcePool:538 - acquire test -- pool size: 0; target_pool_size: 0; desired target? 1 main 14/Dec/2009:13:24:49-0500 DEBUG BasicResourcePool:404 - incremented pending_acquires: 1 main 14/Dec/2009:13:24:49-0500 DEBUG BasicResourcePool:1291 - awaitAvailable(): [unknown] </code></pre> <p><a href="http://logging.apache.org/log4j/1.2/index.html" rel="nofollow noreferrer">log4j</a></p>

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