java.lang.IllegalStateException: call is closed

[Ming Zhao(赵明)]

We got this exception when sending a response on a closed rpc, but I
assume this should be taken by the GRPC channel layer instead of
throwing a runtime exception, did I miss anything?

Exception in thread "pool-1-thread-1" java.lang.IllegalStateException:
call is closed
at com.google.common.base.Preconditions.checkState(Preconditions.java:174)Nov
20, 2015 6:28:41 PM com.luminate.acs.client.CpeTask$Tr069Client
setParameterValues
INFO: Sending SetParameterValues response ...

at io.grpc.internal.ServerImpl$ServerCallImpl.sendMessage(ServerImpl.java:492)
at io.grpc.stub.ServerCalls$ResponseObserver.onNext(ServerCalls.java:241)
at com.luminate.acs.config.AcsRequest.sendResponse(AcsRequest.java:113)
at com.luminate.acs.server.ConfigChannelTask.processCommitRequest(ConfigChannelTask.java:190)
at com.luminate.acs.server.ConfigChannelTask.processClientRequest(ConfigChannelTask.java:78)
at com.luminate.acs.server.RegularConfigTask.configure(RegularConfigTask.java:47)
at com.luminate.acs.server.ApConfigTask.run(ApConfigTask.java:68)
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)

[Eric Anderson]

After close(Status, Metadata) is called, sending messages doesn't make sense. How did you application end up causing this, and what would you expect to happen?

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[Ming Zhao(赵明)]

That's a good point, we should check our code to make sure we don't
call onNext() after calling close(), I just want to sure grpc layer
won't call close() implicitly, for example, when the peer cancels the
RPC.

>> email to grpc-io+u...@googlegroups.com.

[Eric Anderson]

On Fri, Nov 20, 2015 at 11:37 AM, Ming Zhao(赵明) <mz...@luminatewireless.com> wrote:

I just want to sure grpc layer
won't call close() implicitly, for example, when the peer cancels the
RPC.

We use an internal close() that doesn't change the "application called cancel" boolean, so that layer wouldn't throw an exception.

However, on the server with the async stub things aren't quite as simple since there isn't a good way to notify the server when the call is cancelled. So onNext() will throw a StatusRuntimeException on the server if the call becomes cancelled.