[Plugin][Example] Java in UE4 - Text extraction via Tika

Java in UE4 - Text Extractor Plugin

Unreal Engine 4 integraton of Apache Tika™, a Java based library to detect and extract metadata and text from over a thousand different file types (such as PPT, XLS, and PDF).

This was originally part of a paid job, but since I couldn’t find a proper example of Java integration in UE4, here it is.
Feedback is more than welcome on the implementation!

Add the plugin to your plugin folder.
Then, a single method is accessible from C++ or BP: “GetTextFromFile” which takes the path of the file as argument and returns the content parsed if successful.

In case you want to use it from C++, add TextExtractionPlugin to the public dependencies of your module.

A first C++ wrapper is taking care of the creation of a Java Virtual Machine(JVM) as well as loading the Tika Java library via JNI.
This wrapper is encapsulated in a DLL which is dynamically loaded by UE4 and called from a blueprint library.

Since the plugin is using a Java virtual machine, you will see memory exceptions if you are using Visual Studio.
You can just skip them.

um so i can use this to run java in Unreal?

Definitely! :slight_smile:
You can use it as an example of how to run java libraries in UE4.

Im trying to do an streaming app for a online radio. I have teh app working, but the streaming stops when goes to app goes to background. I need a java service to keep the app running on background. Do you have any idea how I can do that?