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java.lang.NullPointerException: 	at org.springframework.mail.MailSendException.toString(MailSendException.java:124)	at org.apache.log4j.or.DefaultRenderer.doRender(DefaultRenderer.java:35)	at org.apache.log4j.or.RendererMap.findAndRender(RendererMap.java:79)	at org.apache.log4j.spi.LoggingEvent.getRenderedMessage(LoggingEvent.java:297)	at org.apache.log4j.helpers.PatternParser$BasicPatternConverter.convert(PatternParser.java:403)	at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:64)	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.error(Log4JLogger.java:239)