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What are those paths?
Those are hardcoded locations where the code expects to find the JUnit Platform Console Standalone JAR — a self-contained JAR that can both compile and run JUnit 5 tests without needing a build tool like Maven or Gradle.
The code checks three candidate paths in order and uses the first one it finds. These paths are Docker container paths (not your local machine), so they need to be present inside whatever container runs your environment.
How to get the JAR in place
1. Download it locally first
Go to Maven Central and grab it:
https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/
Pick the latest version (e.g. 1.10.2), download junit-platform-console-standalone-1.10.2.jar.
Or via curl:
curl -L -o junit-platform-console-standalone.jar \
https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.10.2/junit-platform-console-standalone-1.10.2.jar
2. Put it in your Dockerfile
Since the first candidate path is /app/junit-platform-console-standalone.jar, the cleanest approach is to add this to your Dockerfile:
FROM openjdk:17-slim # or whatever base you're using
# Install JUnit standalone jar
RUN curl -L -o /app/junit-platform-console-standalone.jar \
https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.10.2/junit-platform-console-standalone-1.10.2.jar
# ... rest of your Dockerfile
Or if you've already downloaded it and want to COPY it in:
COPY junit-platform-console-standalone.jar /app/junit-platform-console-standalone.jar
3. Verify it works inside the container
java -jar /app/junit-platform-console-standalone.jar --version
Why a standalone JAR?
The code avoids Maven/Gradle entirely — it manually calls javac to compile and then java -jar junit...jar --select-class TestClass to run. The standalone JAR bundles everything JUnit 5 needs (the launcher, engine, assertions API) in a single file, making it suitable for this kind of scripted sandbox where you don't want a full build system.