Fix errors in integration tests on shutdown of client

[dsyer]

I see some stack traces in tests sometimes because a context is closed before the client is shutdown. Not sure why, and it's mostly harmless, but it would be good to not see it.

[CyberZujo]

@dsyer Can I take this one?

[dsyer]

Sure. I don’t really know how to start. As far as I know we already shut the clients down. It might just be a test that needs fixing?

[dsyer]

Example:

2025-01-22T12:03:02.073Z  INFO 2101293 --- [grpc-server] [ault-executor-0] o.s.grpc.sample.GrpcServerService        : Hello foo
2025-01-22T12:03:02.075Z ERROR 2101293 --- [grpc-server] [ault-executor-0] io.grpc.internal.SerializingExecutor     : Exception while executing runnable io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed@25f6f7aa

java.lang.IllegalStateException: call already closed	at com.google.common.base.Preconditions.checkState(Preconditions.java:513) ~[guava-33.3.1-jre.jar:na]
Preconditions.java:513
	at io.grpc.internal.ServerCallImpl.closeInternal(ServerCallImpl.java:218) ~[grpc-core-1.69.0.jar:1.69.0]
ServerCallImpl.java:218
	at io.grpc.internal.ServerCallImpl.close(ServerCallImpl.java:213) ~[grpc-core-1.69.0.jar:1.69.0]
ServerCallImpl.java:213
	at org.springframework.grpc.server.exception.GrpcExceptionHandlerInterceptor$ExceptionHandlerListener.onHalfClose(GrpcExceptionHandlerInterceptor.java:108) ~[classes/:na]
GrpcExceptionHandlerInterceptor.java:108
	at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:356) ~[grpc-core-1.69.0.jar:1.69.0]
ServerCallImpl.java:356
	at io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:861) ~[grpc-core-1.69.0.jar:1.69.0]
ServerImpl.java:861
	at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37) ~[grpc-core-1.69.0.jar:1.69.0]
ContextRunnable.java:37
	at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133) ~[grpc-core-1.69.0.jar:1.69.0]
SerializingExecutor.java:133
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[na:na]
ThreadPoolExecutor.java:1136
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:na]
ThreadPoolExecutor.java:635
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Thread.java:833

2025-01-22T12:03:02.155Z  INFO 2101293 --- [grpc-server] [ionShutdownHook] o.s.g.s.lifecycle.GrpcServerLifecycle    : Completed gRPC server shutdown

Another (possibly), this time not an integration test:

[INFO] Running org.springframework.grpc.client.GrpcChannelFactoryTests$SpecificGrpcChannelFactoryTests
Jan 22, 2025 12:18:19 PM io.grpc.internal.ManagedChannelOrphanWrapper$ManagedChannelReference cleanQueue
SEVERE: *~*~*~ Previous channel ManagedChannelImpl{logId=1, target=localhost} was garbage collected without being shut down! ~*~*~*
    Make sure to call shutdown()/shutdownNow()
java.lang.RuntimeException: ManagedChannel allocation site
        at io.grpc.internal.ManagedChannelOrphanWrapper$ManagedChannelReference.<init>(ManagedChannelOrphanWrapper.java:102)
        at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:60)
        at io.grpc.internal.ManagedChannelOrphanWrapper.<init>(ManagedChannelOrphanWrapper.java:51)
        at io.grpc.internal.ManagedChannelImplBuilder.build(ManagedChannelImplBuilder.java:710)
        at io.grpc.ForwardingChannelBuilder2.build(ForwardingChannelBuilder2.java:272)
        at org.springframework.grpc.client.DefaultGrpcChannelFactory.createChannel(DefaultGrpcChannelFactory.java:94)
        at org.springframework.grpc.client.GrpcChannelFactoryTests$SpecificGrpcChannelFactoryTests.shadedNettyChannelFactoryUsesShadedNettyChannelBuilder(GrpcChannelFactoryTests.java:144)