title: Spring Batch Reader in Multi threader Job
body: <p>I'm Using Spring Batch to run my JOBS
  when the reader is <strong>org.springframework.batch.item.database.JpaPagingItemReader</strong></p>
  
  <p>And my JOB configured with the parameter:
  <strong>throttle-limit="6"</strong></p>
  
  <p>Is there any threads data conflict when reading data from the reader?</p>
  
  <p>why i'm reviving the following warning:</p>
  
  <pre><code>[org.springframework.batch.core.step.item.ChunkMonitor:109] - No ItemReader set (must be   concurrent step), so ignoring offset data.
  [org.springframework.batch.core.step.item.ChunkMonitor:141] - ItemStream was opened in a different thread.  Restart data could be compromised.
  [org.springframework.batch.core.step.item.ChunkMonitor:141] - ItemStream was opened in a different thread.  Restart data could be compromised.
  [org.springframework.batch.core.step.item.ChunkMonitor:141] - ItemStream was opened in a different thread.  Restart data could be compromised.
  </code></pre>