What does the “Multiple markers” mean?

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“Multiple markers” just means “there’s more than one thing wrong with this line”.

But the basic problem is that you’re trying to insert statements directly into a class, rather than having them in a constructor, method, initializer etc.

I suggest you change your code to something like this:

static Set<String> languages = getDefaultLanguages();

private static Set<String> getDefaultLanguages()
{
    Set<String> ret = new HashSet<String>();
    ret.add("en");
    ret.add("de");
    return ret;
}

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