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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)