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jBPM 5.3 and database access
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created by <a href="https://community.jboss.org/people/jena74">jena74</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/739727#739727">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>I have created a small process which has one script task. In this task, I call one method of a personal Java class. Then this method updates an existing line in an Oracle database <span style="text-decoration: underline;">and commit.</span></p><p>As my table is located in the same schema of the one owning the jBPM persistence tables, in my Java class I use the PoolingDataSource returned by JBPMHelper.setupDataSource().</p><p>But, when I run my process, I have an error saying: </p><p><em>java.sql.SQLException: cannot commit a resource enlisted in a global transaction</em></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>As I configured my jBPM engine to persist the data, I imagine that there is a transaction while my script task executes. That's why I can not to the commit.</p><p>So I am wondering how I should in fact design such a behaviour:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>1) Should I first put my own tables into an Oracle schema different that the one used by jBPM to persist? I think yes.</p><p>2) According to what I read in the documentation, I should also use a Service task instead of a script task as a database access can be long, with timeouts...</p><p>3) Can I reuse in my own Java code the PoolingDataSource returned by JBPMHelper.setupDataSource()? I assume that I should not, and particularly if I put my tables in another schema.</p><p>4) If I write a service task to write in database, how should I design this task? I mean, should I reuse hibernate and the persistence.xml file for that? Can I do basic JDBC accesses? What are the best practices usually applied for such situation?</p><p>5) It is not clear at all in my mind when a transaction starts and stops in a jBPM process. What are the safe points? Could you basically explain?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks a lot.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Jena</p></div>
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