.collect(Collectors.toList());
    }

    private record ExecResult(
        String stdout,
        String stderr,
        int returnCode
    ) {
        @Override
        public String toString() {
            return "ExecResult{returnCode=" + returnCode + ", stdout=" + summarize(stdout) + ", stderr=" + summarize(stderr) + "}";
        }

        private static String summarize(String s) {

                                    .cwd(cwd)
                                    .userHome(userHome)
                                    .stdOut(stdout)
                                    .stdErr(stderr)
                                    .embedded(true)
                                    .build()));
                } catch (InvokerException.ExitException e) {

            this.exitCode = exitCode;
            this.stdout = stdout;
            this.stderr = stderr;
        }

        @Override
        public String toString() {
            return "exitCode=" + exitCode + ", stdout=" + summarize(stdout) + ", stderr=" + summarize(stderr);
        }

        private static String summarize(String s) {

            @Nullable OutputStream stdOut,
            @Nullable OutputStream stdErr,
            boolean embedded)
            throws IOException {
        try (Invoker invoker = createInvoker()) {
            return invoker.invoke(createParser()
                    .parseInvocation(createParserRequestBuilder(args)
                            .stdIn(stdIn)
                            .stdOut(stdOut)
                            .stdErr(stdErr)

    }

    private static String stdout(String... cmd) throws IOException, InterruptedException, ExecutionException {
        ExecResult r = exec(cmd);
        if (r.exitCode() != 0) {
            throw new AssertionError(String.join(" ", cmd) + " failed: " + r);
        }
        return r.stdout();
    }

    private record ExecResult(
        int exitCode,
        String stdout,
        String stderr
    ) {

	}

	stdin := bufio.NewScanner(os.Stdin)
	stdout := bufio.NewWriter(os.Stdout)

	for stdin.Scan() {
		p := stdin.Text()
		if strings.Contains(p, ":") {
			// Reverse translate file:line to pc.
			// This was an extension in the old C version of 'go tool addr2line'
			// and is probably not used by anyone, but recognize the syntax.
			// We don't have an implementation.
			fmt.Fprintf(stdout, "!reverse translation not implemented\n")

                ByteArrayOutputStream stdout = new ByteArrayOutputStream();
                project.exec(spec -> {
                    spec.setExecutable("sysctl");
                    spec.args("-n", "hw.physicalcpu");
                    spec.setStandardOutput(stdout);
                });

                _defaultParallel = Integer.parseInt(stdout.toString().trim());
            }

    }

    String runCommand(String... args) {
        final ByteArrayOutputStream stdout = new ByteArrayOutputStream();

        execOperations.exec(spec -> {
            // The redundant cast is to silence a compiler warning.
            spec.setCommandLine((Object[]) args);
            spec.setStandardOutput(stdout);
        });

        return stdout.toString(StandardCharsets.UTF_8);
    }

    /**

log4j.rootLogger=WARN,STDOUT
log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
log4j.appender.STDOUT.ImmediateFlush=true
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
log4j.appender.STDOUT.layout.ConversionPattern=%-5p %d [%t] %m%n

            String[] args,
            ClassWorld world,
            @Nullable InputStream stdIn,
            @Nullable OutputStream stdOut,
            @Nullable OutputStream stdErr)
            throws IOException {
        return new MavenCling(world).run(args, stdIn, stdOut, stdErr, true);
    }

    public MavenCling() {
        super();
    }

    public MavenCling(ClassWorld classWorld) {