Fix PR comments

shinfan · shinfan · commit 588170652407 · 2017-03-13T11:54:05.000-07:00
diff --git a/google-cloud-core/src/main/java/com/google/cloud/ServiceOptions.java b/google-cloud-core/src/main/java/com/google/cloud/ServiceOptions.java
@@ -397,7 +397,9 @@ protected static String getAppEngineProjectId() {
     } catch (ClassNotFoundException exception) {
       if (System.getProperty("com.google.appengine.runtime.version") != null) {
         // Could not resolve appengine classes under GAE environment.
-        throw new RuntimeException("Unable to resolve appengine-sdk classes. "
+        throw new RuntimeException("Google App Engine runtime detected "
+            + "(the environment variable \"com.google.appengine.runtime.version\" is set), "
+            + "but unable to resolve appengine-sdk classes. "
             + "For more details see "
             + "https://github.com/GoogleCloudPlatform/google-cloud-java/blob/master/APPENGINE.md");
       }
