public StaticInitializer addJarFileResources(final String category, final Collection<String> resources) {
            this.jarFileResources.compute(category, (dummy, old) -> {
                final ArrayList<String> targetList = (old != null) ? old : new ArrayList();
                targetList.addAll(resources);
                return targetList;
            });
            return this;
        }
Represents a pre-defined set of self-contained JAR file resources in the Embulk JAR file.

<p>{@link org.embulk.EmbulkDependencyClassLoader} is introduced only to control the visibility from plugins,
not for customizability. It is intentionally designed to be a singleton.
embulk-core/src/main/java/org/embulk/cli/SelfContainedJarFiles.java