> Just to make sure it isn't related to the payload, could you try to send a push message using the Admin console ? (it will just use the 'alert' field)

Sending a push using the Admin console worked correctly to a test application. I have not tested using the production application, since it is in production.

This is a typical log message where the sending fails, which also includes the payload:

^[[0m[[0m19:53:38,823 INFO [PushNotificationSenderEndpoint] (default task-10) Message submitted to PushNetworks for further processing
^[[0m[[0m19:53:38,826 INFO [JPAPushMessageInformationDao] (EJB default - 3) Processing send request with '[alert=Rosenborg tapte treningskampen mot Viking. Resultatet ble 4-2., data=

, criteria=[aliases=null, deviceTypes=null, categories=null, variants=null], sound=default, action-category=null, badge=-1, time-to-live=-1, simplePush=null, content-available=false]' payload
^[[0m[[33m19:58:38,825 WARN [com.arjuna.ats.arjuna] (Transaction Reaper) ARJUNA012117: TransactionReaper::check timeout for TX 0:ffffc0a8655e:460e760:550bfe11:53cf7 in state RUN
^[[0m[[33m19:58:38,827 WARN [com.arjuna.ats.arjuna] (Transaction Reaper Worker 0) ARJUNA012095: Abort of action id 0:ffffc0a8af55e:460e760:550bfe11:53cf7 invoked while multiple threads active within it.
^[[0m[[33m19:58:38,827 WARN [com.arjuna.ats.arjuna] (Transaction Reaper Worker 0) ARJUNA012108: CheckedAction::check - atomic action 0:ffffc0a8655e:460e760:550bfe11:53cf7 aborting with 1 threads active!
^[[0m[[33m19:58:38,829 WARNING [ClientInstallationServiceImpl] (EJB default - 3) Error on 'ios' delivery
^[[0m[[33m19:58:38,832 WARN [org.hibernate.jpa.spi.AbstractEntityManagerImpl] (EJB default - 3) HHH000326: Cannot join transaction: do not override hibernate.transaction.factory_class
^[[0m[[33m19:58:39,209 WARN [org.hibernate.engine.transaction.synchronization.internal.SynchronizationCallbackCoordinatorTrackingImpl] (Transaction Reaper Worker 0) HHH000451: Transaction afterCompletion called by a background thread; delaying afterCompletion processing until the original thread can handle it. [status=4]
^[[0m[[33m19:58:39,210 WARN [com.arjuna.ats.arjuna] (Transaction Reaper Worker 0) ARJUNA012121: TransactionReaper::doCancellations worker Thread[Transaction Reaper Worker 0,5,main] successfully canceled TX 0:ffffc0a8655e:460e760:550bfe11:53cf7
^[[0m[[31m19:58:39,210 ERROR [org.jboss.as.ejb3.invocation] (EJB default - 3) JBAS014134: EJB Invocation failed on component SenderServiceImpl for method public abstract void org.jboss.aerogear.unifiedpush.message.SenderService.send(org.jboss.aerogear.unifiedpush.api.PushApplication,org.jboss.aerogear.unifiedpush.message.UnifiedPushMessage): javax.ejb.EJBException: JBAS014586: Transaction 'TransactionImple < ac, BasicAction: 0:ffffc0a8655e:460e760:550bfe11:53cf7 status: ActionStatus.ABORTED >' is in unexpected state (STATUS_ROLLING_BACK)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.endTransaction(CMTTxInterceptor.java:116) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:277) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:340) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:239) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:95) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:55) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:326)
at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:439)
at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:326)
at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:185)
at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:182)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:185)
at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:182)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.interceptors.LogDiagnosticContextRecoveryInterceptor.processInvocation(LogDiagnosticContextRecoveryInterceptor.java:79) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:309)
at org.jboss.as.ejb3.component.interceptors.AsyncFutureInterceptorFactory$1$2.runInvocation(AsyncFutureInterceptorFactory.java:97) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at org.jboss.as.ejb3.component.interceptors.AsyncInvocationTask.run(AsyncInvocationTask.java:73) [wildfly-ejb3-8.1.0.Final.jar:8.1.0.Final]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_71]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_71]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_71]
at org.jboss.threads.JBossThread.run(JBossThread.java:122)

^[[0m[[0m00:00:00,025 INFO [ClientInstallationServiceImpl] (EJB default - 10) Deleting ['7'] outdated PushMessageInformation objects