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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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KnowledgeSession issues and best practice
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created by <a href="https://community.jboss.org/people/dboyd68">David Boyd</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/735356#735356">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hey All,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have an interesting scenario that I would like to advice on.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am new to JBPM so appoligies if this is a silly question.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong><br/></strong></p><p>My Scenario is this</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a number of knowledge sessions in Stateless sessions beans. (So not one knolwedge session per request and not a singleton knowledgesession either... understand this is a bad design but stick with me)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The last step in this "fails"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>signal event (workflow 1)</p><p>     within server task execute inner step</p><p> Inner Step          </p><p>          start  new process (workflow 2)</p><p>              raise seam event </p><p>             catch seam event (somewhere else)</p><p>                   siginal event to move workflow 2 along.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My problem is in the last step. Workflow 2 is started but it is never moved i.e. singal event seems to have no effect. Debugging  the code it appears that the internal process instance has the wrong nodes and doesn't <span style="color: #333333; font-size: 10pt; font-family: arial, helvetica, sans-serif;">actually</span> fire execute anything (no excpetions are raised though) </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Attempted solutions.</p><p>1) I attempted to add a  flush() on the entity manager <span style="color: #333333; font-size: 10pt; font-family: arial, helvetica, sans-serif;">associated </span> with JBPM at ever step. Figured it might be multiple knowledge sessions who haven't flushed data yet. However this didn't help.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2) Make one knowledge session shared by every stateless session bean. This seems to solve the issue but I don't understand why this would work and flush wouldn't.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I am using CMP within a J2EE environment on JBPM 5.1 on JBoss 4.2</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can anyone shed some light on why this might occur? Or if a singleton knowledge session is a valid design?</p></div>
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