BZ-1161574 - 'java.lang.RuntimeException: Process instance XXX is dis…

…connected.' with SingletonRuntimeManager without CMT/BMT

(cherry picked from commit f082b82)

jbpm-runtime-manager/src/main/java/org/jbpm/runtime/manager/impl/SingletonRuntimeManager.java

@@ -75,7 +75,10 @@ public SingletonRuntimeManager(RuntimeEnvironment environment, SessionFactory fa
     }
 
     public void init() {
-
+    	if (System.getProperty("org.kie.tx.lock.enabled") == null &&
+    			((SimpleRuntimeEnvironment)environment).getEnvironmentTemplate().get("TRANSACTION_LOCK_ENABLED") == null) {
+    		((SimpleRuntimeEnvironment)environment).getEnvironmentTemplate().set("TRANSACTION_LOCK_ENABLED", "true");
+    	}
         // TODO should we proxy/wrap the ksession so we capture dispose.destroy method calls?
         String location = getLocation();
         Integer knownSessionId = getPersistedSessionId(location, identifier);