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java.lang.NullPointerException at org.apache.log4j.helpers.PatternConverter.spacePad( at org.apache.log4j.helpers.PatternConverter.format( at org.apache.log4j.PatternLayout.format( at org.apache.log4j.WriterAppender.subAppend( at org.apache.log4j.WriterAppender.append( at org.apache.log4j.AppenderSkeleton.doAppend( at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders( at org.apache.log4j.Category.callAppenders( at org.apache.log4j.Category.forcedLog( at org.apache.log4j.Category.log( at at at org.enhydra.jdbc.pool.GenericPool.cleanUp( at at