ClassFormatError array size > 65535

Question

I have one generated class which get this error. Inside this class, there is one huge static block (5000+ lines). I broke the block into several smaller static blocks but still got this error. Why is that

Edit Code looks like:

private static final Map<Object, Object> nameMap = Maps.newHashMap();
static{
    nameMap.put(xxx);
    .... 5000 similar lines
    nameMap.put(xxx);
}

Answer 1

If it is just data you will need to read the data in from a resource.

Arrange for your data file to be in the same location as the class file and use something like this:

class Primes {

    private static final ArrayList<Integer> NUMBERS = new ArrayList<>();
    private static final String NUMBER_RESOURCE_NAME = "numbers.txt";

    static {
        try (InputStream in = Primes.class.getResourceAsStream(NUMBER_RESOURCE_NAME);
                InputStreamReader isr = new InputStreamReader(in);
                BufferedReader br = new BufferedReader(isr)) {
            for (String line; (line = br.readLine()) != null;) {
                String[] numberStrings = line.split(",");
                for (String numberString : numberStrings) {
                    if (numberString.trim().length() > 0) {
                        NUMBERS.add(Integer.valueOf(numberString));
                    }
                }
            }
        } catch (NumberFormatException | IOException e) {
            throw new IllegalStateException("Loading of static numbers failed", e);
        }
    }
}

I use this to read a comma separated list of 1000 prime numbers.