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I uploaded code to app engine and tried calling apis using api explorer. Its always showing this error:

503 Service Unavailable

Show headers -

{
"error": {
"errors": [
{
"domain": "global",
"reason": "backendError",
"message": "java.lang.NullPointerException"
}
],
"code": 503,
"message": "java.lang.NullPointerException"
}
}

Now that GCM is part of Google Play services, we can no longer get the gcm-server.jar file as detailed in the google documentation or on the documentation for this repo.

README.md references on last step a url that 404's

https://developers.google.com/cloud/samples/mbs/getting_started

Copy / Pasted from App Engine Log:

Uncaught exception from servlet
java.lang.NoClassDefFoundError: org/json/simple/parser/ParseException
at com.google.cloud.backend.spi.ProspectiveSearchServlet.doPost(ProspectiveSearchServlet.java:62)

line 62 -> Sender sender = new Sender(gcmKey);

As mentioned in other issue, I have imported the missing libraries:

• gcm-server.jar
• gson-2.2.4.jar

I am using Eclipse Juno 4.2.2. with Android 4.3 (API 18). The message sent to the server is stored correctly in datastore, but this error keeps arising in the log.

Am I missing anything? Is any other library needed?

Can you include the jars in war/lib?

There's a small but critical bug in the sample. One of the external libraries are not exported into the final APK so the app fails during startup.

To fix this (in Eclipse) go to the Java Build Path -> Order and Export and check the box for "Google APIs". Clean and rebuild the project. The APK should now be around 724KB and run correctly.

Errors seen in the sample project:

05-21 12:32:16.246: E/dalvikvm(16042): Could not find class 'com.google.cloud.backend.android.mobilebackend.model.EntityListDto', referenced from method com.google.cloud.backend.android.CloudBackend.updateAll

05-21 12:32:16.256: W/dalvikvm(16042): Unable to resolve superclass of Lcom/google/cloud/backend/android/mobilebackend/model/EntityListDto; (39)
05-21 12:32:16.256: W/dalvikvm(16042): Link of class 'Lcom/google/cloud/backend/android/mobilebackend/model/EntityListDto;' failed

05-21 12:39:02.039: E/AndroidRuntime(16042): FATAL EXCEPTION: main
05-21 12:39:02.039: E/AndroidRuntime(16042): java.lang.NoClassDefFoundError: com.google.cloud.backend.android.GCMIntentService