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using JTA Transactions in jBPM 3
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created by <a href="https://community.jboss.org/people/AJanz">Sascha Janz</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/833238#833238">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>we are still using jBPM 3.2.3. ( seam and richfaces for frontend ) </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Due to some data inconsistencies between jBPM and our data, i wanted to use JTA Transactions to get control over commit and rollback. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>although i read the documentation i am not quite sure how to use it the right way. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>in jbpm.cfg.cml  isTransactionEnabled must still set to false, is that right  ? </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>in hibernate.cfg.xml i change to JTA</p><p><property name="hibernate.transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property></p><p>  <property name="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</property></p><p>  <property name="jta.UserTransaction">java:comp/UserTransaction</property></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Now i want to set the commit and rollback points in our code. i wrote a simple class TransactionManager with three methods "beginTransaction" , "commitTransaction" and "rollbackTransaction".</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>every method in our code with write access, i extended with these three methods.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>beginTransaction does the following</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>[code]</p><p>// creating new context and store in a ThreadLocal</p><p> jbpmContextThreadLocal.set(cfg.createJbpmContext());</p><p>// on this context start a hibernate transaction </p><p> Transaction  tx = jbpmContextThreadLocal.get().getSession().beginTransaction();</p><p>// and store it also in  a ThreadLocal</p><p>        userTransactionThreadLocal.set(tx);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>[/code]</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>commitTransaction</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>[code]</p><p><span style="font-size: 10pt;">  </span></p><p>          userTransactionThreadLocal.get().commit();</p><p>   userTransactionThreadLocal.remove();</p><p>   </p><p>    //  explizites flush!</p><p>    // s. unter <a class="jive-link-external-small" href="http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.seam/jboss-seam/2.0.0.GA/org/jboss/seam/bpm/ManagedJbpmContext.java" rel="nofollow">http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.seam/jboss-//seam/2.0.0.GA/org/jboss/seam/bpm/ManagedJbpmContext.java</a></p><p>    </p><p>                  jbpmContextThreadLocal.get().getSession().flush();</p><p>    jbpmContextThreadLocal.get().close();</p><p>    jbpmContextThreadLocal.remove();</p><p>[/code]</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> and rollback</p><p>[code]</p><p>      userTransactionThreadLocal.get().rollback();</p><p>     userTransactionThreadLocal.remove();</p><p>     </p><p>      jbpmContextThreadLocal.get().close();</p><p>     jbpmContextThreadLocal.remove();</p><p>[/code]</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #333333; font-size: 10pt;">is this a right way to use JTA Transaction with jBPM ? </span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="color: #2a00ff; font-size: 10pt;"><span style="color: #333333;">or am i doing something wrong?</span><em> </em></span></p></div>
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