PLANNER-1540 Check if solver got lost from http session

deyangdianzi · Jun 27, 2019 · 3f40ab9 · 3f40ab9
1 parent 6e854ca
commit 3f40ab9
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/...les/src/main/java/org/optaplanner/webexamples/cloudbalancing/CloudBalancingWebAction.java b/...les/src/main/java/org/optaplanner/webexamples/cloudbalancing/CloudBalancingWebAction.java
@@ -46,6 +46,11 @@ public void setup(HttpSession session) {
 
     public void solve(final HttpSession session) {
         final Solver<CloudBalance> solver = (Solver<CloudBalance>) session.getAttribute(CloudBalancingSessionAttributeName.SOLVER);
+        if (solver == null) {
+            throw new IllegalStateException("Solver (" + solver + ") cannot be null. As the Solver is not serializable, "
+                                                    + "it might have got lost during a passivation.");
+        }
+
         final CloudBalance unsolvedSolution = (CloudBalance) session.getAttribute(CloudBalancingSessionAttributeName.SHOWN_SOLUTION);
 
         solver.addEventListener(new SolverEventListener<CloudBalance>() {