The Magic of AI Services with LangChain4J

LangChain4J is a port of the Python project LangChain to the Java world. It has many capabilities, but one particularly useful one is that it can generate AI “services” from a simple interface that interact with whatever language model you choose.

This video demonstrates:
* How to set up a Java project that uses LangChain4J
* How to log requests and responses
* How to submit requests to LLMs like OpenAI
* How to test the responses
* How the Gson parser works under the hood

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00:00 - Welcome to Tales from the jar side
00:25 - Introducing LangChain4J
02:00 - langchain4j-examples project
02:46 - Setting up a LangChain4J project
03:37 - Hello, LangChain!
04:50 - PromptTemplates
06:48 - AI Services
08:19 - A Translator Service
10:39 - Sentiment Analyzer
13:07 - DateTimeExtractor
14:51 - Extracting a Record
15:38 - Adding Logging

[lhxperimental]

Cool demo. The challenge with all these AI tools is they don't work 100% of the time. You can't rely on the response which makes them unsuitable for a large number of enterprisey tasks. There was a recent case of a airline company chatbot that advised a customer to cancel tickets to get a refund when there was a no-refund policy. The customer took the airline to court and court ruled in the customer's favor. Enterprises are shit scared of such things and rightly so.

[hrishikeshmishra]

I'm using the Hugging Face LLM model with this, however the response of this llm model is not so accurate, I was curious if I can change the model type of it, as there are many freely available models in hugging face. And also if possible please provide a code snippet.

[magsteel]

Was in your Functional Java session today. Dude this stuff is both cool and scary

[massimodaros]

It's a very interesting video.
The LangChain4j is a very interesting project. For sure I will experiment somethig with it !!
Thanks

[ElvinHoney]

Thanks, that was very helpful! I am working on a Clojure wrapper for Langchain4j (I really hate having to use python from Java/Clojure). I see in the API that you can bypass the Annotation mechanism and create tool descriptors yourself and then stuff those into the builder. That would be best for me since Java Annotations are not so elegant in Clojure.

[mckeeh]

Fantastic video! Thanks for the very helpful explanation.

[jonescomas]

What a passioned and sympathic guy! Thank you!

[mondrisokundolor]

How can I connect LangChain4J to work with MySQL database just like LangChain ?

[freebusdoctor]

Thanks sir it was quite informative video.