Outdated Langfuse Java Client - Blocker for Langfuse v4 upgrade

[cijaaimee]

Describe your question

The Langfuse Java Client is outdated. I've noticed there's no support for the Scores V3 API, even though legacy APIs will be phased out in v4. Since it's autogenerated, perhaps updates can be automated?

Langfuse Cloud or Self-Hosted?

Self-Hosted

If Self-Hosted

No response

If Langfuse Cloud

No response

SDK and integration versions

Langfuse Java 0.2.0

Pre-Submission Checklist

• I have checked for existing issues/discussions and consulted Langfuse AI.

[inkeep-ai-assistant[bot]]

The Java SDK is available for accessing the Langfuse public API. You can install it by adding the following to your pom.xml: (1)

<dependencies>
  <dependency>
    <groupId>com.langfuse</groupId>
    <artifactId>langfuse-java</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </dependency>
</dependencies>
<repositories>
  <repository>
    <id>github</id>
    <name>GitHub Package Registry</name>
    <url>https://maven.pkg.github.com/langfuse/langfuse-java</url>
  </repository>
</repositories>

(1)

However, the available sources don't contain specific information about the Java SDK's support for Scores V3 API or its update schedule. The documentation primarily covers the Python and JS/TS SDKs in detail, noting that in Python SDK v4 and JS/TS SDK v5, high-performance resources like api.observations, api.scores, and api.metrics are the defaults, with legacy v1 resources moved under api.legacy.*. (1)

For self-hosted deployments specifically, the documentation notes that the new v2 endpoints (Observations API v2 and Metrics API v2) are currently Cloud-only, so self-hosted users should use the legacy endpoints available in their Langfuse version. (1)

Since I don't have specific information about Java SDK update timelines or Scores V3 API support in the available sources, I'd recommend opening a feature request on GitHub to request automated updates to the Java client and Scores V3 API support.

📚 Sources:

1. Public API

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[CodeCLS]

Hi @cijaaimee, looking into this. Will get back to you soon

[cijaaimee]

Hey @CodeCLS, thanks for looking into it! Got any updates?

[cijaaimee]

Congratulations to the Langfuse team on v4! 🎉
This issue is currently a blocker for us to upgrade to v4. I'm bumping this for visibility 😄

[cijaaimee]

I've just opened up a PR to update the Java client 😄
langfuse/langfuse-java#46