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java.lang.NullPointerException: channel at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:228) at io.grpc.netty.WriteQueue.<init>(WriteQueue.java:76) at io.grpc.netty.NettyClientHandler.startWriteQueue(NettyClientHandler.java:223) at io.grpc.netty.NettyClientTransport.start(NettyClientTransport.java:172) at io.grpc.internal.ForwardingConnectionClientTransport.start(ForwardingConnectionClientTransport.java:45) at io.grpc.internal.TransportSet.startNewTransport(TransportSet.java:215) at io.grpc.internal.TransportSet.obtainActiveTransport(TransportSet.java:188) at io.grpc.internal.ManagedChannelImpl$3.getTransport(ManagedChannelImpl.java:637) at io.grpc.internal.ManagedChannelImpl$3.getTransport(ManagedChannelImpl.java:579)