grpc-java | HTTP/2 based RPC

We have moved our DataAccess logic to Microservice and it is currently implemented as gRPC with C++ and we are able to utilize that in C# client and C++ client.

Now we have to make use of this DataAccess grpc in Matlab client(legacy). So, i'm trying to find a way to access gRPC from Matlab and found that there is no official support for this.

I found two solutions,

Using Java

I have tried as suggested in this thread. i have created a sample grpc client java using Eclipse. but when i try to access that class/methods from matlab, i'm facing below issue,

This is my protoc setup in build.gradle which works in gradle 4.2

In TLS mutual authentication, I am aware that ClientAuth(io.grpc.netty.shaded.io.netty.handler.ssl.ClientAuth to be precise) has three modes:

1. None - Server does not request for any client certificate
2. Optional - Server requests for a client certificate but whether it is valid or not server will allow it pass through
3. Require - Client must provide a valid certificate

But say I have two grpc service definitions. For the first one I do not want any authentication and for the next one I do want to have the strict require authentication. How to do this?

Should the server then be configured for 'Optional' mode and then an interceptor would be required to validate the client certificate based on the service being accessed by the client? If yes, then this does seem comparatively heavier, and also leaves more risk for error.

(Perhaps the previous paragraph make me sound like a lazy person and as outsourcing my security work to be done by someone else :p , but I am just trying to find out the best possible way to achieve this functionality and re-use existing frameworks instead of re-doing it)

Originally asked as a question here but have not received any response so far.

Sorry, I'm not english native.

I connected with google log.When I started for spring boot,the program is died.Because Too many logs print out. This is my log and error.

I'm trying to configure mail service in simple spring boot app to send email notifications.

Here is my config:

I am trying to add grpc health check to my dart backend, but it seems that the grpc implementation in dart does not bring the service for the kubernetes health check, as in other grpc implementations, as is the case of java https://grpc.github.io/grpc-java/javadoc/io/grpc/services/HealthStatusManager.html#getHealthService--.

how can i do this in dart ?

I have a pom file that correctly generates the grpc and protobuf source files I need in target/generated-sources when run from the command line. But when I build in vscode those directories are empty and references to the protobufs are undefined. Here's the section of my pom file that builds the grpc source.

I am using grpc-java (netty) for my client-server communication. Currently, I am using NettyChannelBuilder to create a single channel (which is backed by a single http2 connection i believe) and I use the channel to create all my GRPC stubs. Since the RPS is quite high, I see the a saturation of the grpc channel and requests are starting to queue up. I would like to create more channel (hence naturally more connections). Is there a way to achieve that?

In addition is my assumption that a grpc channel is backed by a single http2 connection?

I am trying to generate stub using protobuf. My pom.xml has below code