Here's an example project.

https://github.com/kinow/gs-spring-boot/tree/reproduce-google-nlp-issue/complete

Here's the diff: spring-guides/gs-spring-boot@master...kinow:reproduce-google-nlp-issue

I forked the Spring Boot Getting Started sample application, which is using the latest version of Spring Boot. Created a branch, and added google-cloud-language 0.9.4-alpha (used the sample code from https://cloud.google.com/natural-language/docs/samples).

If you start the original project with mvn clean spring-boot:run, you will see a page with just the "Greetings from Spring Boot!" text. Starting the branch (you may have to export JSON credentials location via envVar), instead of seeing that message, you will get a Whitelabel Error Page (default error handler page for SpringBoot apps). Looking at the logs, you will find the following exception:

io.grpc.StatusRuntimeException: DEADLINE_EXCEEDED
	at io.grpc.Status.asRuntimeException(Status.java:545) ~[grpc-core-1.0.3.jar:1.0.3]
	at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:442) ~[grpc-stub-1.0.3.jar:1.0.3]
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:481) ~[grpc-core-1.0.3.jar:1.0.3]
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:398) ~[grpc-core-1.0.3.jar:1.0.3]
	at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:513) ~[grpc-core-1.0.3.jar:1.0.3]
	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:52) ~[grpc-core-1.0.3.jar:1.0.3]
	at io.grpc.internal.SerializingExecutor$TaskRunner.run(SerializingExecutor.java:154) ~[grpc-core-1.0.3.jar:1.0.3]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_121]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_121]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) ~[na:1.8.0_121]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) ~[na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_121]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_121]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_121]

In the branch pom.xml, I added the entries to use Jetty instead of Tomcat embedded container. Uncommenting those lines and running again with mvn clean spring-boot:run, you will have Jetty embedded container, which works fine with Google Cloud NLP API.

Adding an exclusion to io.netty:netty-tcnative-boringssl-static to google-cloud-language does not work. The issue persists, and you still get a DEADLINE EXCEEDED exception.

I've cloned the google-cloud-java locally. Updated all dependencies as suggested in this issue, except for Grpc which was breaking the tests, installed a snapshot locally, and updated the example to use google-cloud-java:0.9.5-alpha-SNAPSHOT. All tests in google-cloud-java passed, and the application also started up successfully, but the issue persisted.

Simply updating netty-tcnative to 2.x won't fix the issue. My guess now is that with a version of grpc-netty (and hence a newer version of netty, compatible with netty-tcnative 2.x) the issue may be fixed. Will file a new issue for that, once I have some more time to debug the problem. Sorry for hijacking this issue.

Bruno

Update protobuf/grpc/tcnative dependencies #1691

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