Index: lams_learning/src/java/org/lamsfoundation/lams/learning/learningApplicationContext.xml
===================================================================
diff -u -r16cd3133dc19ff6616b672670eb509da8eef590e -r733eb2e21e1eb54366032ebb068168f7315c6cf5
--- lams_learning/src/java/org/lamsfoundation/lams/learning/learningApplicationContext.xml	(.../learningApplicationContext.xml)	(revision 16cd3133dc19ff6616b672670eb509da8eef590e)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/learningApplicationContext.xml	(.../learningApplicationContext.xml)	(revision 733eb2e21e1eb54366032ebb068168f7315c6cf5)
@@ -55,7 +55,7 @@
 				<prop key="knockGate">PROPAGATION_REQUIRED</prop>
 				<prop key="determineBranch">PROPAGATION_REQUIRED</prop>				
 				<prop key="selectBranch">PROPAGATION_REQUIRED</prop>
-				<prop key="create*">PROPAGATION_REQUIRED,+java.lang.Exception</prop>
+				<prop key="create*">PROPAGATION_REQUIRED</prop>
 				<prop key="learner*">PROPAGATION_REQUIRED</prop>
 				<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
    			</props>
Index: lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java
===================================================================
diff -u -r8d65c7f51b3ecf744f55283d17bbb10d8c29eb95 -r733eb2e21e1eb54366032ebb068168f7315c6cf5
--- lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java	(.../LearnerService.java)	(revision 8d65c7f51b3ecf744f55283d17bbb10d8c29eb95)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/service/LearnerService.java	(.../LearnerService.java)	(revision 733eb2e21e1eb54366032ebb068168f7315c6cf5)
@@ -1042,21 +1042,9 @@
 	try {
 	    toolSession = lamsCoreToolService.createToolSession(learner, toolActivity, lesson);
 	} catch (DataIntegrityViolationException e) {
-	    LearnerService.log.warn("There was an attempt to create two tool sessions with the same name. Retrying...",
-		    e);
-	    /*
-	     * LDEV-1533: Two users tried to create a tool session with the same name. One of them was successful, the
-	     * other got an error. The second one will now retry. This might create a loop; on the other hand the second
-	     * attempt should be successful, since either the existing session will be retrieved or a session with a new
-	     * name will be created.
-	     * 
-	     * This workaround can not be in LamsCoreToolService (initially it was). If the exception occurs, the
-	     * transaction is unusable anymore and any further DB actions will throw an error. We need to restart the
-	     * transaction on the higher level - here.
-	     * 
-	     * This exception should never occur, as lamsCoreToolService.createToolSession is now synchronized.
-	     * Nevertheless, it sometimes occurs, so additional security measures stay.
-	     */
+	    LearnerService.log
+		    .warn("There was an attempt to create two tool sessions with the same name. Skipping further attempts as the session exists.",
+			    e);
 	}
 	if (toolSession != null) {
 	    toolActivity.getToolSessions().add(toolSession);
Index: lams_learning/src/java/org/lamsfoundation/lams/learning/web/action/LoadToolActivityAction.java
===================================================================
diff -u -r3964cdfe296f1449e9b31978efc16e4a38a1c5d6 -r733eb2e21e1eb54366032ebb068168f7315c6cf5
--- lams_learning/src/java/org/lamsfoundation/lams/learning/web/action/LoadToolActivityAction.java	(.../LoadToolActivityAction.java)	(revision 3964cdfe296f1449e9b31978efc16e4a38a1c5d6)
+++ lams_learning/src/java/org/lamsfoundation/lams/learning/web/action/LoadToolActivityAction.java	(.../LoadToolActivityAction.java)	(revision 733eb2e21e1eb54366032ebb068168f7315c6cf5)
@@ -75,14 +75,10 @@
 		ActivityMapping actionMappings = LearnerServiceProxy.getActivityMapping(this.getServlet().getServletContext());
 		
 		ICoreLearnerService learnerService = getLearnerService();
-        	LearnerProgress learnerProgress = LearningWebUtil.getLearnerProgress(request, learnerService);
-        	Activity activity = LearningWebUtil.getActivityFromRequest(request, learnerService);
-        	try {
-        	    learnerService.createToolSessionsIfNecessary(activity, learnerProgress);
-        	} catch (Exception e) {
-        	    log.warn("Got exception while trying to create a tool session, but carrying on.", e);
-        	}
-
+		LearnerProgress learnerProgress = LearningWebUtil.getLearnerProgress(request,learnerService);
+		Activity activity = LearningWebUtil.getActivityFromRequest(request, learnerService);
+		learnerService.createToolSessionsIfNecessary(activity, learnerProgress);
+				
 		form.setActivityID(activity.getActivityId());
 		
 		String mappingName = "displayTool";