Allow using langchain4j module

[anunnakian]

I add langchain4j support by using langchain4j-spring-starter dependency (version: 0.35.0)

It fixes #9298

[CLAassistant]

All committers have signed the CLA.

[anunnakian]

@pascalgrimaud @jdubois what do you think about these changes

[pascalgrimaud]

Suggested change

	# LangChain4J
	# LangChain4j

[jdubois]

Oh I do that mistake all the time!!!!!

[anunnakian]

CamelCase syndrome 😄

[pascalgrimaud]

In another PR, I would add a new module sample-langchain4j-controller, with something like:

import dev.langchain4j.model.chat.ChatLanguageModel;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api")
class ChatController {

  private final ChatLanguageModel chatLanguageModel;

  public ChatController(ChatLanguageModel chatLanguageModel) {
    this.chatLanguageModel = chatLanguageModel;
  }

  @GetMapping("/chat")
  public String model(@RequestParam(value = "message", defaultValue = "Hello") String message) {
    return chatLanguageModel.generate(message);
  }
}

So it will help the user to test it (similar to the documentation):

[jdubois]

Super happy to see this! As I'm mostly using Azure OpenAI and GitHub Models, I'll need to have a look at adding those on top of this PR.

[anunnakian]

In another PR, I would add a new module sample-langchain4j-controller, with something like:

import dev.langchain4j.model.chat.ChatLanguageModel;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api")
class ChatController {

  private final ChatLanguageModel chatLanguageModel;

  public ChatController(ChatLanguageModel chatLanguageModel) {
    this.chatLanguageModel = chatLanguageModel;
  }

  @GetMapping("/chat")
  public String model(@RequestParam(value = "message", defaultValue = "Hello") String message) {
    return chatLanguageModel.generate(message);
  }
}

So you'll have to make langChain4j module dependent on spring-boot-mvc-empty because you'll need rest dependency

[pascalgrimaud]

In another PR, I would add a new module sample-langchain4j-controller, with something like:

import dev.langchain4j.model.chat.ChatLanguageModel;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api")
class ChatController {

  private final ChatLanguageModel chatLanguageModel;

  public ChatController(ChatLanguageModel chatLanguageModel) {
    this.chatLanguageModel = chatLanguageModel;
  }

  @GetMapping("/chat")
  public String model(@RequestParam(value = "message", defaultValue = "Hello") String message) {
    return chatLanguageModel.generate(message);
  }
}

So you'll have to make langChain4j module dependent on spring-boot-mvc-empty because you'll need rest dependency

exactly @anunnakian :-)

[pascalgrimaud]

Thanks a lot for your contribution @anunnakian !

[anunnakian]

https://opencollective.com/generator-jhipster/expenses/227229

[pascalgrimaud]

@anunnakian : approved