io.grpc.internal.ChannelExecutor drain: Runnable threw exception in ChannelExecutor (ChannelExecutor.java:89)
java.lang.NullPointerException
	at com.google.apphosting.runtime.ApiProxyImpl$CurrentRequestThreadFactory.newThread(ApiProxyImpl.java:1267)
	at com.google.common.util.concurrent.ThreadFactoryBuilder$1.newThread(ThreadFactoryBuilder.java:162)
	at java.util.concurrent.ThreadPoolExecutor$Worker.<init>(ThreadPoolExecutor.java:612)
	at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:925)
	at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1587)
	at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:336)
	at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:555)
	at io.grpc.internal.ManagedChannelImpl.rescheduleIdleTimer(ManagedChannelImpl.java:334)
	at io.grpc.internal.ManagedChannelImpl.exitIdleMode(ManagedChannelImpl.java:299)
	at io.grpc.internal.ManagedChannelImpl$4$1.run(ManagedChannelImpl.java:357)
	at io.grpc.internal.ChannelExecutor.drain(ChannelExecutor.java:87)
	at io.grpc.internal.ManagedChannelImpl$4.get(ManagedChannelImpl.java:359)
	at io.grpc.internal.ClientCallImpl.start(ClientCallImpl.java:218)
	at io.grpc.ForwardingClientCall.start(ForwardingClientCall.java:47)
	at com.google.api.gax.grpc.HeaderInterceptor$1.start(HeaderInterceptor.java:62)
	at io.grpc.stub.ClientCalls.startCall(ClientCalls.java:276)
	at io.grpc.stub.ClientCalls.asyncUnaryRequestCall(ClientCalls.java:252)
	at io.grpc.stub.ClientCalls.futureUnaryCall(ClientCalls.java:186)
	at com.google.pubsub.v1.PublisherGrpc$PublisherFutureStub.publish(PublisherGrpc.java:460)
	at com.google.cloud.pubsub.v1.Publisher.publishOutstandingBatch(Publisher.java:329)
	at com.google.cloud.pubsub.v1.Publisher.publishAllOutstanding(Publisher.java:304)
	at com.google.cloud.pubsub.v1.Publisher.access$500(Publisher.java:79)
	at com.google.cloud.pubsub.v1.Publisher$5.run(Publisher.java:283)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:295)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

dependencies {
  providedCompile 'javax.servlet:javax.servlet-api:3.1.0'
  providedCompile 'com.google.appengine:appengine:+'
  testCompile 'org.eclipse.jetty:jetty-server:9.+'
  testCompile 'org.eclipse.jetty:jetty-servlet:9.+'
  compile group: 'com.google.guava', name: 'guava', version: '19.+'
  compile group: 'com.google.inject', name: 'guice', version: '4.+'
  compile 'com.google.appengine:appengine-api-1.0-sdk:1.+'
  compile 'com.google.cloud:google-cloud-storage:1.2+'
  compile group: 'com.google.cloud', name: 'google-cloud-pubsub', version: '0.20+'
  compile ('com.google.cloud:google-cloud-datastore:1.2+')
  compile('com.google.apis:google-api-services-cloudkms:v1-rev15-1.22.0') {
     exclude(group: 'com.google.guava', module: 'guava-jdk5')
  }
  compile(group: 'com.google.api-client', name: 'google-api-client', version: '1.+') {
     exclude(group: 'com.google.guava', module: 'guava-jdk5')
  }
  compile(group: 'com.google.api-client', name: 'google-api-client-appengine', version: '1.+') {
     exclude(group: 'com.google.guava', module: 'guava-jdk5')
  }
}