<dependencies> <dependency> <groupId>io.grpc</groupId> <artifactId>grpc-core</artifactId> <version>1.38.0</version> </dependency> </dependencies> ManagedChannel channel = ManagedChannelBuilder.forAddress("localhost", 50051) .usePlaintext() .build(); BlockingStub blockingStub = YourServiceGrpc.newBlockingStub(channel) YourResponse response = blockingStub.yourMethod(yourRequest); channel.shutdown(); proto service YourService { rpc YourMethod (YourRequest) returns (YourResponse) {} } YourRequest request = YourRequest.newBuilder() .setField1("value1") .setField2("value2") .build(); YourResponse response = blockingStub.yourMethod(request); ManagedChannel channel = NettyChannelBuilder.forAddress("localhost", 50051) .build();