I've been doing a little future-proofing in the XPages Jakarta EE project lately and bumped against a common pitfall in my test setup: since I create a fresh Domino Testcontainer with each run, diagnostic information like the XPages log files are destroyed at the end of each test-suite execution.

Historically, I've combatted this manually: if I make sure to not close the container and I kill the Ryuk watcher container the framework spawns before testing is over, then the Domino container will linger around. That's fine and all, but it's obviously a bit crude. Plus, other than when I want to make subsequent HTTP calls against it, I generally want the same stuff: IBM_TECHNICAL_SUPPORT and the Equinox logs dir.

Building on a hint from a GitHub issue reply, I modified my test container to add a hook to its close event to copy the log files into the IT module's target directory.

In my DominoContainer class, which builds up the container from my settings, I added an implementation of containerIsStopping:

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@SuppressWarnings("nls")
@Override
protected void containerIsStopping(InspectContainerResponse containerInfo) {
	super.containerIsStopping(containerInfo);
		
	try {
		// If we can see the target dir, copy log files
		Path target = Paths.get(".").resolve("target"); //$NON-NLS-1$ //$NON-NLS-2$
		if(Files.isDirectory(target)) {
			this.execInContainer("tar", "-czvf", "/tmp/IBM_TECHNICAL_SUPPORT.tar.gz", "/local/notesdata/IBM_TECHNICAL_SUPPORT");
			this.copyFileFromContainer("/tmp/IBM_TECHNICAL_SUPPORT.tar.gz", target.resolve("IBM_TECHNICAL_SUPPORT.tar.gz").toString());
				
			this.execInContainer("tar", "-czvf", "/tmp/workspace-logs.tar.gz", "/local/notesdata/domino/workspace/logs");
			this.copyFileFromContainer("/tmp/workspace-logs.tar.gz", target.resolve("workspace-logs.tar.gz").toString());
		}
	} catch(IOException | UnsupportedOperationException | InterruptedException e) {
		e.printStackTrace();
	}
}

This will tar/gzip up the logs en masse and drop them in my project's output:

Having this happen automatically should save me a ton of hassle in the cases where I need this, and I figured it was worth sharing in case it's useful to others.