}

    @Nonnull
    private ConditionEvent checkThatHasOnlyAllowedTypes(String methodName) {
        return checkThatMethodHasOnlyAllowedArgumentTypesOrReturnTypes(methodName, String.class, String.class);
    }

    @Nonnull
    private ConditionEvent checkThatMethodHasOnlyAllowedArgumentTypesOrReturnTypes(String methodName, Class<?>... arguments) {