}

    @Override
    public String getMaxHeapSize() {
        return options.getMaxHeapSize();
    }

    @Override
    public void setMaxHeapSize(String heapSize) {
        options.setMaxHeapSize(heapSize);
    }

    @Override
    public String getDefaultCharacterEncoding() {
        return options.getDefaultCharacterEncoding();
    }

    @Override

    }

    public void setMinHeapSize(String heapSize) {
        this.minHeapSize = heapSize;
    }

    public String getMaxHeapSize() {
        return maxHeapSize;
    }

    public void setMaxHeapSize(String heapSize) {
        this.maxHeapSize = heapSize;
    }

    public String getDefaultCharacterEncoding() {
        return immutableSystemProperties.get(FILE_ENCODING_KEY).toString();
    }

    abstract protected WorkerExecutor getWorkerExecutor();

    protected void configureForkOptions(JavaForkOptions forkOptions) {
        forkOptions.setMinHeapSize(getMinHeapSize().getOrNull());
        forkOptions.setMaxHeapSize(getMaxHeapSize().getOrNull());
        forkOptions.setExecutable(getJavaLauncher().get().getExecutablePath().getAsFile().getAbsolutePath());
        maybeAddOpensJvmArgs(getJavaLauncher().get(), forkOptions);
    }

        javaCommand.args("'" + displayName + "'");
        if (javaCommand.getMaxHeapSize() == null) {
            javaCommand.setMaxHeapSize("512m");
        }
        ExecHandle execHandle = javaCommand.build();

        workerProcess.setExecHandle(execHandle);

            task.setOutputDir(extension.getUserManual().getStagingRoot().dir("render-single-pdf").get().getAsFile());
            // The PDF rendering needs at least 2GB of heap
            task.jvm(options -> options.setMaxHeapSize("3g"));
        });

        TaskProvider<AsciidoctorTask> userguideMultiPage = tasks.register("userguideMultiPage", AsciidoctorTask.class, task -> {
            task.setGroup("documentation");