Method findMainMethod

src/main/java/groovy/lang/GroovyShell.java:382–399

Finds the main method to invoke using JEP-512 priority order: static main(String[]) > static main(Object) > static main() > instance main(String[]) > instance main(Object) > instance main().

(Class<?> scriptClass)

     * > instance main(String[]) > instance main(Object) > instance main().
     */
    private static Method findMainMethod(Class<?> scriptClass) {
        Class<?>[][] signatures = { {String[].class}, {Object.class}, {} };
        // static methods first
        for (Class<?>[] paramTypes : signatures) {
            try {
                Method m = scriptClass.getMethod(MAIN_METHOD_NAME, paramTypes);
                if (Modifier.isStatic(m.getModifiers())) return m;
            } catch (NoSuchMethodException ignore) { }
        }
        // then instance methods
        for (Class<?>[] paramTypes : signatures) {
            try {
                Method m = scriptClass.getMethod(MAIN_METHOD_NAME, paramTypes);
                if (!Modifier.isStatic(m.getModifiers())) return m;
            } catch (NoSuchMethodException ignore) { }
        }
        return null;
    }

    private static Object runRunnable(Class scriptClass, String[] args) {
        Constructor constructor = null;