[grid] Improve json body of error message sent from NewSessionQueue

pujagani · pujagani · commit 17f25bcb9d41 · 2021-12-03T14:04:20.000+05:30
diff --git a/java/src/org/openqa/selenium/grid/sessionqueue/local/LocalNewSessionQueue.java b/java/src/org/openqa/selenium/grid/sessionqueue/local/LocalNewSessionQueue.java
@@ -5,6 +5,7 @@
 import static org.openqa.selenium.concurrent.ExecutorServices.shutdownGracefully;
 
 import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.ImmutableMap;
 
 import org.openqa.selenium.Capabilities;
 import org.openqa.selenium.SessionNotCreatedException;
@@ -221,7 +222,10 @@ public HttpResponse addToQueue(SessionRequest request) {
         res.setContent(Contents.bytes(result.right().getDownstreamEncodedResponse()));
       } else {
         res.setStatus(HTTP_INTERNAL_ERROR)
-          .setContent(Contents.asJson(Collections.singletonMap("value", result.left())));
+          .setContent(Contents.asJson(ImmutableMap.of(
+            "value", ImmutableMap.of("error", "session not created",
+                                     "message", result.left().getMessage(),
+                                     "stacktrace", result.left().getStackTrace()))));
       }
 
       return res;
