Fix TransientObjectException when allocating a resource to a previously saved schedule

Fixes #3

libreplan-business/src/main/java/org/libreplan/business/common/AdHocTransactionService.java

@@ -103,6 +103,7 @@ public class AdHocTransactionService implements IAdHocTransactionService {
         };
     }
 
+    @Override
     @Transactional
     public <T> T runOnTransaction(IOnTransaction<T> onTransaction) {
         return onTransaction.execute();

libreplan-webapp/src/main/java/org/libreplan/web/planner/order/SaveCommandBuilder.java

@@ -589,9 +589,19 @@ public class SaveCommandBuilder {
                 removeEmptyConsolidation(taskElement);
                 updateLimitingResourceQueueElementDates(taskElement);
 
-                if (taskElement.getTaskSource() != null && taskElement.getTaskSource().isNewObject())
+                if (taskElement.getTaskSource() != null && taskElement.getTaskSource().isNewObject()) {
                     saveTaskSources(taskElement);
 
+                    // hack to update taskPropertiesController reference to current currentTaskElement
+                    if (SaveCommandBuilder.taskPropertiesController != null) {
+                        TaskElement taskControllerTaskElement = SaveCommandBuilder.taskPropertiesController.getCurrentTaskElement();
+                        if ( taskControllerTaskElement != null && taskControllerTaskElement.getOrderElement() == taskElement.getOrderElement() &&
+                                taskControllerTaskElement.isNewObject()) {
+                            SaveCommandBuilder.taskPropertiesController.setCurrentTaskElement(taskElement);
+                        }
+                    }
+                }
+
                 updateLimitingQueueDependencies(taskElement);
             }
             saveRootTask();

libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/TaskPropertiesController.java

@@ -826,4 +826,12 @@ public class TaskPropertiesController extends GenericForwardComposer<Component>
         return this;
     }
 
+    public TaskElement getCurrentTaskElement() {
+        return currentTaskElement;
+    }
+
+    public void setCurrentTaskElement(TaskElement taskElement) {
+        currentTaskElement = taskElement;
+    }
+
 }