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http://issues.apache.org/bugzilla/show_bug.cgi?id=37182


[EMAIL PROTECTED] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED




------- Additional Comments From [EMAIL PROTECTED]  2007-01-26 20:02 -------

  public void testToStringFail() {
    Object o = new Object() {
      public String toString() { throw new NullPointerException(); }
    };
    logger.debug(o);
  }


This currently fails with:

java.lang.NullPointerException
        at org.apache.log4j.CategoryTest$1.toString(CategoryTest.java:158)
        at org.apache.log4j.or.DefaultRenderer.doRender(DefaultRenderer.java:34)
        at org.apache.log4j.or.RendererMap.findAndRender(RendererMap.java:107)
        at 
org.apache.log4j.spi.LoggingEvent.getRenderedMessage(LoggingEvent.java:650)
        at
org.apache.log4j.pattern.MessagePatternConverter.format(MessagePatternConverter.java:58)
        at
org.apache.log4j.pattern.BridgePatternConverter.format(BridgePatternConverter.java:132)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:531)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:360)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:175)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:286)
        at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:67)
        at org.apache.log4j.Category.callAppenders(Category.java:218)
        at org.apache.log4j.Category.forcedLog(Category.java:588)
        at org.apache.log4j.Category.debug(Category.java:284)
        at org.apache.log4j.CategoryTest.testToStringFail(CategoryTest.java:160)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

What is the contract for Layout.format()?

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