Pierre Villard created NIFI-4277:

             Summary: StandardLogRepository does not log exceptions
                 Key: NIFI-4277
                 URL: https://issues.apache.org/jira/browse/NIFI-4277
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework
    Affects Versions: 1.3.0
            Reporter: Pierre Villard
            Assignee: Pierre Villard
         Attachments: Screen Shot 2017-08-08 at 2.48.33 PM.png

When logging a message, it is logged with the SLF4J logger and also stored in 
the standard log repository (for the bulletins). However if the array of 
objects contains the exception (and not the message of the exception), this 
exception won't be displayed in the bulletin message.

!Screen Shot 2017-08-08 at 2.48.33 PM.png|thumbnail!

That's because of:

    public void addLogMessage(final LogLevel level, final String format, final 
Object[] params) {
        final String formattedMessage = MessageFormatter.arrayFormat(format, 
        addLogMessage(level, formattedMessage);

If the params object contains a Throwable object, it'll be removed from the 
array in the {{MessageFormatter}}:

    final public static FormattingTuple arrayFormat(final String 
messagePattern, final Object[] argArray) {
        Throwable throwableCandidate = getThrowableCandidate(argArray);
        Object[] args = argArray;
        if (throwableCandidate != null) {
            args = trimmedCopy(argArray);
        return arrayFormat(messagePattern, args, throwableCandidate);

Easy solution would be to change:

logger.debug("Failed to validate {} against schema due to {}", new 
Object[]{flowFile, e});


logger.debug("Failed to validate {} against schema due to {}", new 
Object[]{flowFile, e.getLocalizedMessage()});

However this pattern can be found in quite a large number of places... And it'd 
be certainly better to provide a permanent solution supporting the existing 
pattern. Suggestion is to modify the method in {{StandardLogRepository}} to go 
through all the items of the array and for each Throwable object, replace it by 
the localized message.

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