Index: modules/pvm/src/main/java/org/jbpm/pvm/internal/model/ExecutionImpl.java
===================================================================
--- modules/pvm/src/main/java/org/jbpm/pvm/internal/model/ExecutionImpl.java	(revision 6519)
+++ modules/pvm/src/main/java/org/jbpm/pvm/internal/model/ExecutionImpl.java	(working copy)
@@ -1284,7 +1284,13 @@
     this.processInstance = processInstance;
   }
   public String getKey() {
-    return key;
+    if (this.key != null) {
+      return key;
+    }
+    if (this.superProcessExecution != null) {
+      return this.superProcessExecution.getKey();
+    }
+    return null;
   }
   public Propagation getPropagation() {
     return propagation;
Index: modules/test-db/src/test/java/org/jbpm/test/activity/subprocess/SubProcessTest.java
===================================================================
--- modules/test-db/src/test/java/org/jbpm/test/activity/subprocess/SubProcessTest.java	(revision 6519)
+++ modules/test-db/src/test/java/org/jbpm/test/activity/subprocess/SubProcessTest.java	(working copy)
@@ -28,9 +28,12 @@
 import java.util.Map;
 
 import org.eclipse.jdt.internal.compiler.ast.AssertStatement;
+import org.jbpm.api.Execution;
 import org.jbpm.api.JbpmException;
 import org.jbpm.api.ProcessInstance;
 import org.jbpm.api.task.Task;
+
+import org.jbpm.pvm.internal.model.ExecutionImpl;
 import org.jbpm.test.JbpmTestCase;
 
 
@@ -137,4 +140,17 @@
     assertEquals(0, executionService.createProcessInstanceQuery().list().size());
   }
 
+  // Test for JBPM-2772
+  public void testSubProcessWithKey() {
+    deployJpdlXmlString(SUB_PROCESS);
+    deployJpdlXmlString(MAIN_PROCESS);
+
+    ProcessInstance processInstance = executionService.startProcessInstanceByKey("mainProcess", "business key");
+    Execution subProcessInstance = processInstance.getSubProcessInstance();
+    assertEquals("business key", ((ExecutionImpl)subProcessInstance).getKey());
+
+    Task task = taskService.findPersonalTasks("johndoe").get(0);
+    taskService.completeTask(task.getId(), "nok");
+  }
+
 }