Simple Usage example for the Extism Java SDK

This is a simple example for using the java-sdk of the extism web-assembly plugin system with a JVM application.

Setup

The extism library uses a native library written in rust to load and execute web-assembly code. Therefore it is required to install the extism library in the library path, see https://extism.org/docs/install.

Alternatively the path to the extism library can also be specified via the system property -Djna.library.path=/path/to/exitsm/lib

Build

mvn verify

Run

via exec-maven-plugin:

mvn compile exec:java -Dexec.mainClass="example.ExtismExample"

or plain java launcher:

$ java -cp target/extism-java-*-with-dependencies.jar example.ExtismExample "src/main/resources/code.wasm" count_vowels "Hello World"

Example output:

Executing "count_vowels" from "src/main/resources/code.wasm" with input "Hello World"
{"count": 3}