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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (NIFI-4277) StandardLogRepository does not log exceptions
Date Wed, 09 Aug 2017 09:52:00 GMT


ASF GitHub Bot commented on NIFI-4277:

GitHub user pvillard31 opened a pull request:

    NIFI-4277 Fixed exception logging in StandardLogRepository

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You can merge this pull request into a Git repository by running:

    $ git pull NIFI-4277

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2068
commit 7e91f4ed597d337e0e8b882d89b9d92a8a316df8
Author: Pierre Villard <>
Date:   2017-08-09T09:50:53Z

    NIFI-4277 Fixed exception logging in StandardLogRepository


> StandardLogRepository does not log exceptions
> ---------------------------------------------
>                 Key: NIFI-4277
>                 URL:
>             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
> That's because of:
> {|borderStyle=solid}
>     @Override
>     public void addLogMessage(final LogLevel level, final String format, final Object[]
params) {
>         final String formattedMessage = MessageFormatter.arrayFormat(format, params).getMessage();
>         addLogMessage(level, formattedMessage);
>     }
> {code}
> If the params object contains a Throwable object, it'll be removed from the array in
the {{MessageFormatter}}:
> {|borderStyle=solid}
>     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);
>     }
> {code}
> Easy solution would be to change:
> {noformat}
> logger.debug("Failed to validate {} against schema due to {}", new Object[]{flowFile,
> {noformat}
> into:
> {noformat}
> logger.debug("Failed to validate {} against schema due to {}", new Object[]{flowFile,
> {noformat}
> 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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