@Override
    public Object callMethodArray(
            final Object receiver,
            final String methodName,
            final Object[] args) throws JRubyInvalidRuntimeException {
        return getInitialized().callMethodArray(receiver, methodName, args);
    }
Indirects onto JRuby with initializing ScriptingContainer lazily.
embulk-core/src/main/java/org/embulk/jruby/LazyScriptingContainerDelegate.java