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java.lang.NullPointerException: 	at org.springframework.mail.MailSendException.toString(	at org.apache.log4j.or.DefaultRenderer.doRender(	at org.apache.log4j.or.RendererMap.findAndRender(	at org.apache.log4j.spi.LoggingEvent.getRenderedMessage(	at org.apache.log4j.helpers.PatternParser$BasicPatternConverter.convert(	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 org.apache.commons.logging.impl.Log4JLogger.error(