Not Skipping exceptions in spring batch -

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spring batch not able skip below exception. can body suggest did miss here?

<batch:job id="runpromotion">            <batch:step id="readpromotionstep">             <batch:tasklet ref="processpromotion"></batch:tasklet>             <batch:next on="success" to="getpromotionalpoints" />             <batch:end on="failed"></batch:end>              <batch:listeners>                 <batch:listener ref="queryprovider"/>                        </batch:listeners>                   </batch:step>         <batch:step id="getpromotionalpoints">                   <batch:tasklet >                             <batch:chunk reader="transactiondatareader" writer="userpromotionwriter" commit-interval="100" skip-limit="100">                                 <batch:skippable-exception-classes >                     <batch:include class="org.hibernate.exception.constraintviolationexception"/>                     <batch:include class="javax.persistence.persistenceexception"/>                 </batch:skippable-exception-classes>                 </batch:chunk>             </batch:tasklet>             <batch:listeners>                 <batch:listener ref="queryprovider"/>                        </batch:listeners>           </batch:step>         </batch:job>

below error while running batch :

2013-08-24 14:43:16,451 - [main] warn : org.hibernate.engine.jdbc.spi.sqlexceptionhelper:143 - sql error: 1062, sqlstate: 23000 2013-08-24 14:43:16,451 - [main] error: org.hibernate.engine.jdbc.spi.sqlexceptionhelper:144 - duplicate entry '1' key 'promotion_id' javax.persistence.persistenceexception: org.hibernate.exception.constraintviolationexception: duplicate entry '1' key 'promotion_id' @ org.hibernate.ejb.abstractentitymanagerimpl.convert(abstractentitymanagerimpl.java:1377)


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