@Override
    public void setBundleGemfile(final String gemfilePath) throws JRubyInvalidRuntimeException {
        getInitialized().setBundleGemfile(gemfilePath);
    }
Indirects onto JRuby with initializing ScriptingContainer lazily.
embulk-core/src/main/java/org/embulk/jruby/LazyScriptingContainerDelegate.java