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Re: jBPM 5.2 set process instance variable from java - NullPointerException
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created by <a href="https://community.jboss.org/people/slash17">Salvatore Loria</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/733594#733594">View the full discussion</a>
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<div class="jive-rendered-content"><p>Thanks for the answer.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My jBPMSession is of course active....I instantiate it in in the init() method of my startup servlet and dispose it in it's destroy method.</p><p>Moreover I'm sure it's active because I can start new processes without problems.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I tried both creating it (using newStatefullKnoledgeSession) and load it from db (using loadStatefullKnoledgeSession)...nothing changes.</p><p>Moreover, I'm trying to access and modify a variable af a process just created in this session, not in a previous one, so I don't think that creating o loading it could be the problem.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Yet another code snippet to better explain my situation:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">Map<String, Object> vars = <font color="navy"><b>new</b></font> HashMap<String, Object>();
vars.put(<font color="red">"user"</font>, <font color="red">"john"</font>);
ProcessInstance processInstance = jBPMSession.startProcess(<font color="red">"MyProcess"</font>);
<font color="darkgreen">// the process starts correctly</font>
WorkflowProcessInstance p = (WorkflowProcessInstance) processInstance;
System.out.println(<font color="red">"before set: "</font> + p.getVariable(<font color="red">"user"</font>));
<font color="darkgreen">// it works and print "bofore set: john" as you can see in the first post</font>
p.setVariable(<font color="red">"user"</font>, <font color="red">"krisv"</font>);
<font color="darkgreen">// this throws the NullPointerException...</font>
</code></pre></div>
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