Stripped down example of working with errorable static init blocks

EncodingHelperCharNames.java

public class EncodingHelperCharNames {

    private static HashMap<Integer, String> CHARACTER_NAMES;
    private static boolean enabled = false;

    static {
        readFile(false);
    }

    /**
     * Extract reading functionality to be able to pretend to fail for testing
     *
     * @param testFail Whether method should pretend to fail
     */
    static void readFile(boolean testFail) {
        // stuff
    }

    public static boolean isEnabled() {
        return enabled;
    }

    private static void checkEnabled() throws IOException {
        if (!enabled) {
            throw new IOException("Character names weren't loaded");
        }
    }

    public static String getName(int codepoint) throws IOException {
        checkEnabled();
        // actual stuff
    }
}