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POClientside error (Cannot call method 'nullMethod' of null arguments: nullMethod)
 

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  1. POClientside error (Cannot call method 'nullMethod' of null arguments: nullMethod)
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    <p>My App engine/ GWT project is spitting out a nasty little pile of stack trace whenever it attempts to return from my login method. I am using GAE version 1.5.0 and GWT version 2.3.0 .</p> <p>It's a facebook app, so what I've got is this:</p> <ul> <li>The player navigates to the app page.</li> <li>They click a button, and are redirected to the OAuth authentication page</li> <li>They are then redirected back to the app, with the authentication token in the query string</li> <li>I break the query string apart to get the UID, and then use that as the primary key for my Player entity (RPC to app engine backend)</li> <li>I retrieve the Player entity instance from the datastore, and turn it into a serializable type to return to the client</li> <li>Epic fail.</li> </ul> <p>When I spit out the exception in a JSAlert, I get a big nasty pile of stack trace (I already was thoughtful enough to compile using "pretty" instead of "obfuscated").</p> <p>My login function looks like this:</p> <pre><code>@Override public ClientPlayer login(String uid) { PersistenceManager pm=PMF.get().getPersistenceManager(); log.warning(Player.class.getName()); log.warning(uid); Key k=KeyFactory.createKey(Player.class.getSimpleName(), uid); Player p; List&lt;List&lt;Integer&gt;&gt; stats; try{ p=pm.getObjectById(Player.class, k); } catch (JDOObjectNotFoundException e){ p=new Player(uid); p.setKey(k); pm.makePersistent(p); } finally { pm.close(); } stats=p.getStats(); return new ClientPlayer(p.getUID(),p.getPerm(), p.getDecks(),stats.get(0), stats.get(1), stats.get(2)); } </code></pre> <p>Unfortunately, due to NDA, I can't link to the app, but here's the output:</p> <pre><code> Failure to log in because of: com.google.gwt.core.client.JavaScriptException: (TypeError): Cannot call method 'nullMethod' of null arguments: nullMethod, type: non_object_property_call stack: TypeError: Cannot call method 'nullMethod' of null at Object.ClientPlayer_1 (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:993:89) at Object.ClientPlayer_0 (http://*com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:984:18) at Array.instantiate_1 [as 0] (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:1031:10) at $instantiate_0 (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:10660:34) at $instantiate (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:1948:10) at $readObject (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:10148:95) at Object.read_8 [as read] (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:10608:10) at $onResponseReceived (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:10352:247) at $fireOnResponseReceived (http://*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:5002:5) at Object.onReadyStateChange (http:/*.com/com.MES.Tap2/A37A2E2E9A65DB1BAAE2BFA42572F7F8.cache.html:5222:5) </code></pre>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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