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java.lang.NullPointerException: 	at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)	at org.apache.log4j.DailyRollingFileAppender.subAppend(DailyRollingFileAppender.java:343)	at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)	at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)	at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57)	at org.apache.log4j.Category.callAppenders(Category.java:190)	at org.apache.log4j.Category.forcedLog(Category.java:375)	at org.apache.log4j.Category.info(Category.java:696)