### Eclipse Workspace Patch 1.0
#P jbpm4
Index: modules/test-db/src/test/java/org/jbpm/test/variables/VariableExpressionTest.java
===================================================================
--- modules/test-db/src/test/java/org/jbpm/test/variables/VariableExpressionTest.java	(revision 6285)
+++ modules/test-db/src/test/java/org/jbpm/test/variables/VariableExpressionTest.java	(working copy)
@@ -72,6 +72,40 @@
     assertEquals(new Integer(10), counter);
   }
   
+  public void testNullValueExpression() {
+    deployJpdlXmlString(
+            "<process name='theProcess'>" +
+            "  <start name='theStart'>" +
+            "    <transition to='decideToGoFurther' />" +
+            "  </start>" +
+            "  <custom name='incrementCounter' class='" + MyJavaActivity.class.getName() + "'>" +
+            "   <transition to='decideToGoFurther' />" +
+            "  </custom>" +
+            "  <decision name='decideToGoFurther'>" +
+            "    <transition to='waitHere'>" +
+            "      <condition expr='#{counter}' />" + 
+            "    </transition>" +
+            "    <transition to='incrementCounter'>" +
+            "      <condition expr='#{counter &lt; 10}' />" +
+            "    </transition>" +
+            "  </decision>" +
+            "  <state name='waitHere'>" +
+            "    <transition to='theEnd' />" +
+            "  </state>" +
+            "  <end name='theEnd' />" +
+            "</process>"
+          );
+    
+    Map<String, Object> vars = new HashMap<String, Object>();
+    vars.put("counter", null);
+    
+    ProcessInstance processInstance = executionService.startProcessInstanceByKey("theProcess", vars);
+    assertActivityActive(processInstance.getId(), "waitHere");
+    
+    Object value = executionService.getVariable(processInstance.getId(), "counter");
+    assertEquals(true, value);
+  }
+  
   
   public static class MyJavaActivity implements ActivityBehaviour {