Good to hear that you have a solution.
If you start with the multilanguage question type but want to restrict it just to Java, you can edit the Ace Language field under Advanced Customisation so that it's just Java. Then the language-selection dropdown will disappear. But the Twig {{ LANGUAGE }} variable won't be defined then, so you'll have to hard-code 'java' in the template.
If you start with the multilanguage question type but want to restrict it just to Java, you can edit the Ace Language field under Advanced Customisation so that it's just Java. Then the language-selection dropdown will disappear. But the Twig {{ LANGUAGE }} variable won't be defined then, so you'll have to hard-code 'java' in the template.