[jboss-jira] [JBoss JIRA] Created: (JBPM-964) NullPointerException in ContextInstance.setVariable(java.lang.String name, java.lang.Object value) method.

[Vt Ysh (JIRA)]

NullPointerException in ContextInstance.setVariable(java.lang.String name, java.lang.Object value) method.
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                 Key: JBPM-964
                 URL: http://jira.jboss.com/jira/browse/JBPM-964
             Project: JBoss jBPM
          Issue Type: Bug
          Components: Core Engine
    Affects Versions: jBPM jPDL 3.2
         Environment: Windows XP SP2, jbpm-jpdl-3.2.GA
            Reporter: Vt Ysh
         Assigned To: Tom Baeyens
            Priority: Trivial


NullPointerException occurs when trying to set variable value of byte[] type in ContextInstance. Error happens only in one case, then value is not null and has zero length

Here is a junit TestCase which represents an error

import junit.framework.TestCase;

import org.jbpm.context.exe.ContextInstance;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.ProcessInstance;

public class ContextTest extends TestCase {

	public void testContext() {
		ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(
				"<process-definition>" +
				"  <start-state>" +
				"    <transition to='s' />" +
				"  </start-state>" +
				"  <state name='s'>" +
				"    <transition to='end' />" +
				"  </state>" +
				"  <end-state name='end' />" +
				"</process-definition>"
		);

		ProcessInstance processInstance =
			new ProcessInstance(processDefinition);

		ContextInstance contextInstance = 
			processInstance.getContextInstance();
		try
		{
			contextInstance.setVariable("test", new byte[0]);
			fail("Should raise NullPointer exception");
		}catch(NullPointerException e)
		{
			e.printStackTrace();
		}

		processInstance.signal();
	}

}

Console output:

java.lang.NullPointerException
	at java.util.ArrayList.<init>(ArrayList.java:133)
	at org.jbpm.bytes.ByteArray.<init>(ByteArray.java:60)
	at org.jbpm.context.log.variableinstance.ByteArrayUpdateLog.<init>(ByteArrayUpdateLog.java:41)
	at org.jbpm.context.exe.variableinstance.ByteArrayInstance.setObject(ByteArrayInstance.java:44)
	at org.jbpm.context.exe.VariableInstance.setValue(VariableInstance.java:137)
	at org.jbpm.context.exe.VariableInstance.create(VariableInstance.java:74)
	at org.jbpm.context.exe.VariableContainer.setVariableLocally(VariableContainer.java:157)
	at org.jbpm.context.exe.VariableContainer.setVariable(VariableContainer.java:45)
	at org.jbpm.context.exe.ContextInstance.setVariable(ContextInstance.java:166)
	at org.jbpm.context.exe.ContextInstance.setVariable(ContextInstance.java:156)
	...

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