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java.lang.NullPointerException at java.lang.System.arraycopy(Native Method) at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:331) at java.lang.StringBuffer.getChars(StringBuffer.java:202) at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.java:120) at java.text.DateFormat.format(DateFormat.java:314) at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(PatternParser.java:436) at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:56) at org.apache.log4j.PatternLayout.format(PatternLayout.java:495) at com.atlassian.confluence.util.PatternLayoutWithStackTrace.format(PatternLayoutWithStackTrace.java:30) at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292) 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:187) at org.apache.log4j.Category.forcedLog(Category.java:372) at org.apache.log4j.Category.warn(Category.java:1019)