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Sending mails through kettle generates ConcurrentModificationException error

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Hello ,

Currently I am stuck at a very wierd situation.
When I run a transformation to generate various pdf files and send them to recipients through transformations mail step, I get the below mentioned errors
This happens very strangely.

Any help will be highly appreciable.Please let me know if I need to change any system settings to avoid this issue.

Thnaks
Priyabrata Patnaik


ERROR 15-07 07:10:23,614 - multiple_attachments - java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778)
at java.util.LinkedList$ListItr.next(LinkedList.java:713)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:86)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:167)
at org.pentaho.di.job.Job.execute(Job.java:556)
at org.pentaho.di.job.Job.execute(Job.java:667)
at org.pentaho.di.job.Job.execute(Job.java:667)
at org.pentaho.di.job.Job.execute(Job.java:445)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run(JobEntryJobRunner.java:68)
at java.lang.Thread.run(Thread.java:679)


ERROR 15-07 07:10:23,614 - multiple_attachments - org.pentaho.di.core.exception.KettleException:
Unexpected error occurred while launching entry [mail.0]
at java.lang.Thread.run (Thread.java:679)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run (JobEntryJobRunner.java:68)
at org.pentaho.di.job.Job.execute (Job.java:445)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:556)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:167)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:86)
at java.util.LinkedList$ListItr.next (LinkedList.java:713)
at java.util.LinkedList$ListItr.checkForComodification (LinkedList.java:778)


at org.pentaho.di.job.Job.execute(Job.java:672)
at org.pentaho.di.job.Job.execute(Job.java:667)
at org.pentaho.di.job.Job.execute(Job.java:445)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run(JobEntryJobRunner.java:68)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778)
at java.util.LinkedList$ListItr.next(LinkedList.java:713)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:86)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:167)
at org.pentaho.di.job.Job.execute(Job.java:556)
at org.pentaho.di.job.Job.execute(Job.java:667)
... 4 more


org.pentaho.di.core.exception.KettleException:
Unexpected error occurred while launching entry [Set Variable.0]


Unexpected error occurred while launching entry [mail.0]
at java.lang.Thread.run (Thread.java:679)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run (JobEntryJobRunner.java:68)
at org.pentaho.di.job.Job.execute (Job.java:445)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:556)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:167)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:86)
at java.util.LinkedList$ListItr.next (LinkedList.java:713)
at java.util.LinkedList$ListItr.checkForComodification (LinkedList.java:778)




at org.pentaho.di.job.Job.execute(Job.java:672)
at org.pentaho.di.job.Job.execute(Job.java:445)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run(JobEntryJobRunner.java:68)
at java.lang.Thread.run(Thread.java:679)
Caused by: org.pentaho.di.core.exception.KettleException:
Unexpected error occurred while launching entry [mail.0]
at java.lang.Thread.run (Thread.java:679)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run (JobEntryJobRunner.java:68)
at org.pentaho.di.job.Job.execute (Job.java:445)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:556)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:167)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:86)
at java.util.LinkedList$ListItr.next (LinkedList.java:713)
at java.util.LinkedList$ListItr.checkForComodification (LinkedList.java:778)


at org.pentaho.di.job.Job.execute(Job.java:672)
at org.pentaho.di.job.Job.execute(Job.java:667)
... 3 more
Caused by: java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778)
at java.util.LinkedList$ListItr.next(LinkedList.java:713)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:86)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:167)
at org.pentaho.di.job.Job.execute(Job.java:556)
at org.pentaho.di.job.Job.execute(Job.java:667)
... 4 more
ERROR 15-07 07:10:23,615 - null - An error occurred executing this job entry :
ERROR 15-07 07:10:23,615 - null - org.pentaho.di.core.exception.KettleException:
Unexpected error occurred while launching entry [Set Variable.0]


Unexpected error occurred while launching entry [mail.0]
at java.lang.Thread.run (Thread.java:679)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run (JobEntryJobRunner.java:68)
at org.pentaho.di.job.Job.execute (Job.java:445)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:556)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:167)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:86)
at java.util.LinkedList$ListItr.next (LinkedList.java:713)
at java.util.LinkedList$ListItr.checkForComodification (LinkedList.java:778)




at org.pentaho.di.job.Job.execute(Job.java:672)
at org.pentaho.di.job.Job.execute(Job.java:445)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run(JobEntryJobRunner.java:68)
at java.lang.Thread.run(Thread.java:679)
Caused by: org.pentaho.di.core.exception.KettleException:
Unexpected error occurred while launching entry [mail.0]
at java.lang.Thread.run (Thread.java:679)
at org.pentaho.di.job.entries.job.JobEntryJobRunner.run (JobEntryJobRunner.java:68)
at org.pentaho.di.job.Job.execute (Job.java:445)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:667)
at org.pentaho.di.job.Job.execute (Job.java:556)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:167)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer (Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo (Log4jBufferAppender.java:86)
at java.util.LinkedList$ListItr.next (LinkedList.java:713)
at java.util.LinkedList$ListItr.checkForComodification (LinkedList.java:778)


at org.pentaho.di.job.Job.execute(Job.java:672)
... 3 more
Caused by: java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:778)
at java.util.LinkedList$ListItr.next(LinkedList.java:713)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:86)
at org.pentaho.di.core.logging.Log4jBufferAppender.getLogBufferFromTo(Log4jBufferAppender.java:152)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:158)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:171)
at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:167)
at org.pentaho.di.job.Job.execute(Job.java:556)
at org.pentaho.di.job.Job.execute(Job.java:667)
... 4 more

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