Github user joewitt commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/285#discussion_r56421212
  
    --- Diff: 
nifi-api/src/main/java/org/apache/nifi/processor/AbstractProcessor.java ---
    @@ -27,7 +30,12 @@ public final void onTrigger(final ProcessContext 
context, final ProcessSessionFa
                 onTrigger(context, session);
                 session.commit();
             } catch (final Throwable t) {
    -            getLogger().error("{} failed to process due to {}; rolling 
back session", new Object[]{this, t});
    +            StringWriter stacktraceWriter = new StringWriter();
    --- End diff --
    
    I should clarify...i agree with you this is confusing and not quite doing 
what we want.  We need to fix it.  Can you share a screenshot of what you see 
for a given error in the UI vs what shows in the logs and then let's agree on 
what it should ideally be and then figure out how to get there :-)


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