title: Batch input using Apache Cayenne
body: <p>I tried to process any pack o data, by inputing this into the Oracle database under Cayenne environment. The tests based on thousands rows inserted in one loop.</p>
  
  <p>Each row has its unique ID and in this case used Oracle Sequence to generate the ID.</p>
  
  <p>I noticed, examined Cayenne log, framework used the sequnece correct, but in stage of commit an exception thrown in case of unique ID unconsistency.</p>
  
  <p>When I trurned off PK constraint on this table, the commit phase was done without any exceptions, but after that in the table I could find some duplicated ID even the obtaing it from the sequence was fine.</p>
  
  <p>Has anybody any idea?</p>
  
  <p>Thanks in advance
  Chris.</p>