我正在使用Java Google Vision API来运行一批图像来查找Web属性，并且在最近几个月一直运行良好。现在，我关闭了频道，并在请求中遇到了ClosedChannelException错误。我创建了一个仅用Google provided example进行测试的新项目，却遇到了同样的问题。
我将Maven依赖版本更新为最新版本，但仍然在原始应用程序和新测试项目中遇到了问题。
此处的请求有误：
BatchAnnotateImagesResponse response = vision.batchAnnotateImages(requests);
这是我收到的错误消息：
Exception in thread "main" com.google.api.gax.rpc.UnknownException: io.grpc.StatusRuntimeException: UNKNOWN: channel closed
at com.google.api.gax.rpc.ApiExceptionFactory.createException(ApiExceptionFactory.java:47)
at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:72)
at com.google.api.gax.grpc.GrpcApiExceptionFactory.create(GrpcApiExceptionFactory.java:60)
at com.google.api.gax.grpc.GrpcExceptionCallable$ExceptionTransformingFuture.onFailure(GrpcExceptionCallable.java:95)
at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:61)
at com.google.common.util.concurrent.Futures$4.run(Futures.java:1123)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:435)
at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:900)
at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:811)
at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:675)
at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:492)
at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:467)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:41)
at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:684)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:41)
at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:391)
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:475)
at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:63)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:557)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:478)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:590)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: io.grpc.StatusRuntimeException: UNKNOWN: channel closed
at io.grpc.Status.asRuntimeException(Status.java:526)
... 19 more
Caused by: java.nio.channels.ClosedChannelException
at io.grpc.netty.shaded.io.grpc.netty.Utils.statusFromThrowable(Utils.java:161)
at io.grpc.netty.shaded.io.grpc.netty.NettyClientTransport$5.operationComplete(NettyClientTransport.java:254)
at io.grpc.netty.shaded.io.grpc.netty.NettyClientTransport$5.operationComplete(NettyClientTransport.java:248)
at io.grpc.netty.shaded.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:507)
at io.grpc.netty.shaded.io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:481)
at io.grpc.netty.shaded.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:420)
at io.grpc.netty.shaded.io.netty.util.concurrent.DefaultPromise.setFailure(DefaultPromise.java:113)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPromise.setFailure(DefaultChannelPromise.java:87)
at io.grpc.netty.shaded.io.grpc.netty.ProtocolNegotiators$AbstractBufferingHandler.fail(ProtocolNegotiators.java:558)
at io.grpc.netty.shaded.io.grpc.netty.ProtocolNegotiators$BufferUntilTlsNegotiatedHandler.userEventTriggered(ProtocolNegotiators.java:652)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:329)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeUserEventTriggered(AbstractChannelHandlerContext.java:315)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.fireUserEventTriggered(AbstractChannelHandlerContext.java:307)
at io.grpc.netty.shaded.io.netty.handler.ssl.SslUtils.notifyHandshakeFailure(SslUtils.java:317)
at io.grpc.netty.shaded.io.netty.handler.ssl.SslHandler.notifyHandshakeFailure(SslHandler.java:1533)
at io.grpc.netty.shaded.io.netty.handler.ssl.SslHandler.setHandshakeFailure(SslHandler.java:1518)
at io.grpc.netty.shaded.io.netty.handler.ssl.SslHandler.channelInactive(SslHandler.java:1004)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:224)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelInactive(DefaultChannelPipeline.java:1354)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:245)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:231)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:917)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannel$AbstractUnsafe$8.run(AbstractChannel.java:822)
at io.grpc.netty.shaded.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
at io.grpc.netty.shaded.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
... 1 more
Caused by: java.nio.channels.ClosedChannelException
at io.grpc.netty.shaded.io.netty.handler.ssl.SslHandler.channelInactive(...)(Unknown Source)