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java.lang.NullPointerException at org.apache.log4j.helpers.PatternConverter.spacePad(PatternConverter.java:106) at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:82) at org.apache.log4j.PatternLayout.format(PatternLayout.java:503) at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:301) at org.apache.log4j.WriterAppender.append(WriterAppender.java:159) at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:230) at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:65) at org.apache.log4j.Category.callAppenders(Category.java:203) at org.apache.log4j.Category.forcedLog(Category.java:388) at org.apache.log4j.Category.log(Category.java:853) at org.apache.commons.logging.impl.Log4JLogger.info(Log4JLogger.java:133) at org.enhydra.jdbc.util.Logger.info(Logger.java:43) at org.enhydra.jdbc.pool.GenericPool.cleanUp(GenericPool.java:737) at org.enhydra.jdbc.pool.PoolKeeper.run(PoolKeeper.java:60) at java.lang.Thread.run(Thread.java:595)