gRPC Client without Quarkus/"Library mode"

[d0x7]

So I created a gRPC Microservice using Quarkus, which I wanna consume now. But its consumed from a non-web application. Its a application that starts as a standalone.
Usually, I would just import a library and use it, but I can't just add Quarkus' gRPC as a maven module.

I could also go ahead and use grpc-java/grpc.io, but then I wouldn't have support for Mutiny plus I would need to learn a second library, one for server, one for client.

Is there currently no real solution for this, or am I overseeing something? Thanks :)

[quarkus-bot[bot]]

/cc @alesj(grpc), @cescoffier(grpc)

[alesj]

but I can't just add Quarkus' gRPC as a maven module.

Why not?

[d0x7]

I'm sorry I only come back to this now - I was working on different projects.

Just to make this clear in before, is it possible to use Quarkus only as a client (for gRPC and Kafka), without any resteasy or other (HTTP) servers, etc. - therefore only the client?
Afaic for that I would only need the dependencies and a method that loads a configuration file, then goes through all classes to find classes annotated with @ApplicationScoped and in those classes, find variables annotated with @Inject or in case of gRPC @gRPCClient.

The Quarkus.run() method I found here, has a lot of things attached I don't need, like the quarkus-ide-launcher module (which gets shaded into my jar, but shouldn't be there from what I read in some GitHub Issues). I asssume the correct method to start Quarkus in my use case (which is that my jar itself is not self contained/executable, but gets loaded via another application dynamically at runtime as a kind of plugin and then has its onEnabled method called, from where I'm trying to start up Quarkus and use the gRPC Client) would be Quarkus.manualInitialize(). But aside from the comment above the method itself, I cannot find ANY documentation whatsoever about how to use it properly. When I try to use that method, I get an ClassNotFoundException because io.quarkus.runner.ApplicationImpl couldn't be found. I think this method is usally generated by Quarkus, but it is not for some reason.

Could you give me any further advice for my specific situation? Is Quarkus even supposed to be used in a client only scenario (because it seems that Quarkus itself has some kind of lifecycle, which a client would normally not have/need, from my understanding. It'd just load a config, initialize the gRPC client and that client can then used by my code to access the gRPC server, but Quarkus seems to be running something in the background (aside from the gRPC connection), as Quarkus.run is a blocking method).

Thanks a lot already :)

For completeness, the exception Quarkus.run() is throwing:

java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "java.net.URL.getPath()" because "resource" is null
        at io.quarkus.launcher.QuarkusLauncher.launch(QuarkusLauncher.java:58) ~[?:?]
        at io.quarkus.runtime.Quarkus.launchFromIDE(Quarkus.java:101) ~[?:?]
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:88) ~[?:?]
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:44) ~[?:?]
        at io.quarkus.runtime.Quarkus.run(Quarkus.java:124) ~[?:?]
        at com.xiamli.testplugin.TestPlugin.onEnable(TestPlugin.java:37) ~[?:?]
        // only methods from the application, which loads and then calls my plugin
        at java.lang.Thread.run(Thread.java:1589) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "java.net.URL.getPath()" because "resource" is null
        at io.quarkus.launcher.QuarkusLauncher.launch(QuarkusLauncher.java:31) ~[?:?]
        ... 17 more

[maxandersen]

Are you by any chance trying to use quarkus libraries without running the quarkus maven plugin? Just guessing as it sounds da like you are not seeing the jar generated that should not include dev mode features (like ide dev launcher)

[alesj]

What do you mean as a client? You can use Quarkus to run some request, and then explicitly shut it down. Think of it as a lambda function …

…

On Wed, 18 Jan 2023 at 09:46, Dorian ***@***.***> wrote: I'm sorry I only come back to this now - I was working on different projects. Just to make this clear in before, is it possible to use Quarkus only as a client (for gRPC and Kafka), without any resteasy or other (HTTP) servers, etc. - therefore only the client? Afaic for that I would only need the dependencies and a method that loads a configuration file, then goes through all classes to find classes annotated with @ApplicationScoped and in those classes, find variables annotated with @Inject <https://github.com/Inject> or in case of gRPC @gRPCClient. The Quarkus.run() method I found here <https://quarkus.io/guides/lifecycle#the-main-method>, has a lot of things attached I don't need, like the quarkus-ide-launcher module (which gets shaded into my jar, but shouldn't be there from what I read in some GitHub Issues). I asssume the correct method to start Quarkus in my use case (which is that my jar itself is not self contained/executable, but gets loaded via another application dynamically at runtime as a kind of plugin and then has its onEnabled method called, from where I'm trying to start up Quarkus and use the gRPC Client) would be Quarkus.manualInitialize(). But aside from the comment above the method itself, I cannot find ANY documentation whatsoever about how to use it properly. When I try to use that method, I get an ClassNotFoundException because io.quarkus.runner.ApplicationImpl couldn't be found. I think this method is usally generated by Quarkus, but it is not for some reason. Could you give me any further advice for my specific situation? Is Quarkus even supposed to be used in a client only scenario (because it seems that Quarkus itself has some kind of lifecycle, which a client would normally not have/need, from my understanding. It'd just load a config, initialize the gRPC client and that client can then used by my code to access the gRPC server, but Quarkus seems to be running something in the background (aside from the gRPC connection), as Quarkus.run is a blocking method). Thanks a lot already :) For completeness, the exception Quarkus.run() is throwing: java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "java.net.URL.getPath()" because "resource" is null at io.quarkus.launcher.QuarkusLauncher.launch(QuarkusLauncher.java:58) ~[?:?] at io.quarkus.runtime.Quarkus.launchFromIDE(Quarkus.java:101) ~[?:?] at io.quarkus.runtime.Quarkus.run(Quarkus.java:88) ~[?:?] at io.quarkus.runtime.Quarkus.run(Quarkus.java:44) ~[?:?] at io.quarkus.runtime.Quarkus.run(Quarkus.java:124) ~[?:?] at com.xiamli.testplugin.TestPlugin.onEnable(TestPlugin.java:37) ~[?:?] // only methods from the application, which loads and then calls my plugin at java.lang.Thread.run(Thread.java:1589) ~[?:?] Caused by: java.lang.NullPointerException: Cannot invoke "java.net.URL.getPath()" because "resource" is null at io.quarkus.launcher.QuarkusLauncher.launch(QuarkusLauncher.java:31) ~[?:?] ... 17 more — Reply to this email directly, view it on GitHub <#30077 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACRA6B2OG3IVFU2PPAPKFDWS6UV5ANCNFSM6AAAAAATJ4VDJA> . You are receiving this because you were mentioned.Message ID: ***@***.***>