Simple Sample, bu "An existing connection was forcibly closed by the remote host"

[nicolas...@gmail.com]

Hi all,

I am new in protobuff... and I already need some help.

Here a simple sample I have successfuly created, a simple service which getData from a server..

I get an error (An existing connection was forcibly closed by the remote host), just after the client received the final acknowledgement.

It means I can not use ma servezr more than once :)

I am using, on windows7,

Java 8

protoc:3.0.0-beta-2

protoc-gen-grpc-java:0.14.0
protobuf-maven-plugin 0.5.0
grpc-netty 0.14.0
grpc-protobuf 0.14.0
grpc-stub 0.14.0

On Client Side,

ManagedChannel channel = ManagedChannelBuilder.forAddress(host, port)
 .usePlaintext(true)
 .build();ViewServiceGrpc.ViewServiceBlockingClient blockingStub = ViewServiceGrpc.newBlockingStub(channel);
blockingStub.getData();

channel.shutdown();

On the server Side:


server = ServerBuilder.forPort(port).addService(ViewServiceGrpc.bindService(new ViewServiceGrpc.ViewService() {
 public void getData(View request, StreamObserver<Ack> responseObserver) {
 switch (request.getDataCase()) {
 
 responseObserver.onNext(Ack.newBuilder().setAckMessage("ACK_OK").build());
 responseObserver.onCompleted();
 }

 })).build();
 server.start();

Everything is OK, except this error on server side

juin 28, 2016 3:33:47 PM io.grpc.netty.NettyServerHandler onConnectionError AVERTISSEMENT: Connection Error java.io.IOException: Une connexion existante a dû être fermée par l’hôte distant at sun.nio.ch.SocketDispatcher.read0(Native Method) at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43) at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) at sun.nio.ch.IOUtil.read(IOUtil.java:192) at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380) at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288) at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1054) at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:245) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:106) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:527) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:484) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:398) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:370) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:742) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:145) at java.lang.Thread.run(Thread.java:745) juin 28, 2016 3:33:47 PM io.grpc.netty.NettyServerTransport notifyTerminated GRAVE: Transport failed java.io.IOException: Une connexion existante a dû être fermée par l’hôte distant at sun.nio.ch.SocketDispatcher.read0(Native Method) at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43) at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) at sun.nio.ch.IOUtil.read(IOUtil.java:192) at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380) at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288) at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1054) at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:245) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:106) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:527) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:484) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:398) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:370) at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:742) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:145) at java.lang.Thread.run(Thread.java:745)



Thanks for your help.

[Nicolas Vacelet]

I answer to Myself;

To correctly close the client, and avoid an exception, one should use 

channel.shutdown.awaitTermination(5, SECONDS)

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[Eric Anderson]

Sorry, I was going to reply with something like that yesterday and things came up. Glad you got it working.

It means I can not use ma servezr more than once

However, the server shouldn't die even without the awaitTermination(). Future clients should work fine. If not, that's a bug.

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