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jBPM with SQL Server
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created by <a href="http://community.jboss.org/people/paqman">Dominique Paquin</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/627487#627487">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello all,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> I have been working on trying to integrate jBPM in out current product we are developping. I have been successful in running hte in-memory version of the project but I now need to store my process states in a data base for later recovery.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm using SQL Server 2005 </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My problem is in seting up the connection. I was able to setup a connection simply using our javax.persistence.EntityManagerFactory (which has a org.apache.commons.dbcp.BasicDataSource in it) and giving it as argument like this (with a JTA transaction manager):</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre><p>    env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, this.dataEntityManagerFactory);</p><p>    env.set(EnvironmentName.TRANSACTION_MANAGER, new JtaTransactionManager());</p></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and later calling </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre><p>    JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, env);</p></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>But when I start a process, I have a crash due to a missing TransactionManager. </p><pre><p>    ...</p><p>    Caused by: org.springframework.transaction.CannotCreateTransactionException: No JTA UserTransaction available - programmatic PlatformTransactionManager.getTransaction usage not supported</p><p>          at org.springframework.transaction.jta.JtaTransactionManager.doGetTransaction(JtaTransactionManager.java:770)</p><p>          at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:335)</p><p>          at org.drools.container.spring.beans.persistence.DroolsSpringTransactionManager.begin(DroolsSpringTransactionManager.java:49)</p><p>          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:120)</p><p>          ... 65 more</p></pre><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>So I tried to feed it the transaction manager we have already existing in our product, org.springframework.transaction.PlatformTransactionManager, </p><pre><p>    env.set(EnvironmentName.TRANSACTION_MANAGER, platformTransactionManager);</p></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>but the code craches a bit further with:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre><p>    2011-09-20 09:12:52,409 [525023568@qtp-1417375004-4] [ERROR] [org.drools.persistence.SingleSessionCommandService] - Could not commit session</p><p>    java.lang.NullPointerException</p><p>          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:125)</p><p>          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)</p><p>          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)</p><p>          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)</p><p>          at java.lang.reflect.Constructor.newInstance(Constructor.java:513)</p><p>          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:116)</p><p>          at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:54)</p><p>          at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)</p><p>          ...</p><p>    ...</p><p>    ...</p><p>    Caused by: java.lang.NullPointerException</p><p>          at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:125)</p><p>          ... 65 more</p></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is the persistence.xml file I use:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre><p>    <?xml version="1.0" encoding="UTF-8" standalone="yes"?></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span>    <persistence version="1.0" xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" target="_blank">http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/orm" target="_blank">http://java.sun.com/xml/ns/persistence/orm</a><span> </span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/orm_1_0.xsd" target="_blank">http://java.sun.com/xml/ns/persistence/orm_1_0.xsd</a><span>"</span></p><p><span>      xmlns:orm="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/orm" target="_blank">http://java.sun.com/xml/ns/persistence/orm</a><span>" xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>" xmlns="</span><a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a><span>"></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>      <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA"></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <provider>org.hibernate.ejb.HibernatePersistence</provider></p><p>        <!--  jta-data-source>jdbc/processInstanceDS</jta-data-source --></p><p>        <class>org.drools.persistence.info.SessionInfo</class></p><p>        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class></p><p>        <class>org.drools.persistence.info.WorkItemInfo</class></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <properties></p><p>          <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/></p><p>          <property name="hibernate.max_fetch_depth" value="3"/></p><p>          <property name="hibernate.hbm2ddl.auto" value="update"/></p><p>          <property name="hibernate.show_sql" value="true"/></p><p>          <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup"/></p><p>        </properties></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>      </persistence-unit></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    </persistence></p></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I obviously can't post my code since this is part of a huge project but if you have specific questions, I can answer them. Help would be appreciated, be it with comments on what I posted above or a Dummy's guide on how to run jBPM with SQL Server <span> :) </span></p></div>
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