Migrate from LangChain4j Plugin to Plugin AI

Breaking Change

The LangChain4j plugin has been renamed and is now available as Plugin AI, with a new repository and package namespace. Starting in Kestra 0.24, you must update all flows using langchain4j to reference the new plugin-ai package. No functional changes were made; this is a rename for clarity and future extensibility.

The new Plugin AI repository is https://github.com/kestra-io/plugin-ai.

Required Migration Steps

  • Update all flow definitions:

    • Change type: and provider: values from io.kestra.plugin.langchain4j.* to io.kestra.plugin.ai.*
    • Adjust any provider types under provider: to use the new namespace, as shown in the examples below.

Before 0.24 (using langchain4j):

id: chat_completion
namespace: company.team


inputs:
  - id: prompt
    type: STRING


tasks:
  - id: chat_completion
    type: io.kestra.core.plugin.langchain4j.completion.ChatCompletion
    provider:
      type: io.kestra.plugin.langchain4j.provider.GoogleGemini
      apiKey: "{{secret('GOOGLE_API_KEY')}}"
      modelName: gemini-2.5-flash
    messages:
      - type: SYSTEM
        content: You are a helpful assistant, answer concisely, avoid overly casual language or unnecessary verbosity.
      - type: USER
        content: "{{inputs.prompt}}"

After migrating to 0.24 (using plugin-ai):

id: chat_completion
namespace: company.team


inputs:
  - id: prompt
    type: STRING


tasks:
  - id: chat_completion
    type: io.kestra.plugin.ai.completion.ChatCompletion
    provider:
      type: io.kestra.plugin.ai.provider.GoogleGemini
      apiKey: "{{ secret('GOOGLE_API_KEY') }}"
      modelName: gemini-2.5-flash
    messages:
      - type: SYSTEM
        content: You are a helpful assistant, answer concisely, avoid overly casual language or unnecessary verbosity.
      - type: USER
        content: "{{inputs.prompt}}"

Additional Notes

  • The new namespace applies to all AI providers and task types previously under langchain4j.
  • No configuration changes are needed apart from the updated type paths.