Topic

Java LLM API Integration

13 posts on java llm api integration — part of api integration on the n4n AI blog.

Unit testing LLM API calls in Java with WireMock

Step-by-step java wiremock llm api testing tutorial: mock LLM endpoints in Java, inject faults, and validate retry and parsing logic safely.

July 17, 20263 min read

API integrationHow-to

Streaming OpenAI responses in Java with server-sent events

Learn how to implement java sse openai streaming in a plain Java HTTP client, parse Server-Sent Events, and handle token deltas end to end.

July 17, 20263 min read

API integrationTutorial

Retrofit for LLM API integration in Java

Hands-on tutorial to build a Retrofit Java LLM API client for OpenAI-compatible endpoints, with auth, streaming, error handling, and fallback.

July 17, 20262 min read

API integrationTutorial

Parsing OpenAI JSON responses in Java with Jackson

A hands-on tutorial for Java engineers parsing OpenAI API JSON responses with Jackson: model the chat completion schema, handle streaming, and avoid pitfalls.

July 17, 20263 min read

API integrationComparison

OkHttp vs java.net.http for calling LLM APIs in Java

Head-to-head comparison of OkHttp vs java.net.http llm api clients in Java: capabilities, latency, ergonomics, ecosystem, limits, and verdict.

July 17, 20264 min read

API integrationHow-to

Maven setup for an OpenAI-compatible Java client

Set up a maven openai compatible java client with this step-by-step guide: dependencies, base URL config, sample code, and verification.

July 17, 20263 min read

API integrationComparison

LangChain4j vs raw HTTP calls for Java LLM integration

A pragmatic head-to-head comparison of LangChain4j vs raw HTTP Java for LLM integration across capabilities, cost, latency, ergonomics, and limits.

July 17, 20263 min read

API integrationGuide

Java virtual threads for concurrent LLM API calls

Practical guide to Java virtual threads for concurrent LLM API calls: executor setup, structured concurrency, pinning pitfalls, and rate-limit tradeoffs.

July 17, 20263 min read

API integrationHow-to

Handling rate limits in Java LLM API clients

Learn how to build resilient Java LLM API clients for java rate limit llm api scenarios using retry, backoff, and fallback patterns in production.

July 17, 20263 min read

API integrationGuide

Connection pooling for high-throughput LLM calls in Java

Practical guide to java connection pooling llm api calls: configure Apache HttpClient or OkHttp for high throughput, avoid socket leaks, and tune pools.

July 17, 20264 min read

API integrationHow-to

Building an async LLM client in Java with CompletableFuture

Build a non-blocking Java LLM client with CompletableFuture and HttpClient. Step-by-step async patterns for retries, fan-out, and timeouts.

July 17, 20263 min read

API integrationHow-to

Switching from OpenAI's Java SDK to n4n in 5 minutes

Step-by-step guide to switch OpenAI Java SDK to n4n in 5 minutes: repoint base URL, map models, add routing headers, and verify with a smoke test.

July 16, 20263 min read

API integrationTutorial

Calling the OpenAI API from Java with HttpClient

Hands-on tutorial: call the OpenAI API from Java with the standard HttpClient. Build a minimal chat client with JSON parsing, retries, and streaming.

July 16, 20262 min read