TestBean bean = new TestBean();

        // Test null value (should be valid)
        bean.setCronExpression(null);
        Set<ConstraintViolation<TestBean>> violations = validator.validate(bean);
        assertTrue(violations.isEmpty());

        // Test empty string (should be valid)
        bean.setCronExpression("");
        violations = validator.validate(bean);
        assertTrue(violations.isEmpty());

    }

    public String getCronExpression() {
        checkSpecifiedProperty("cronExpression");
        return convertEmptyToNull(cronExpression);
    }

    public void setCronExpression(String value) {
        registerModifiedProperty("cronExpression");
        this.cronExpression = value;
    }

    public Boolean getJobLogging() {
        checkSpecifiedProperty("jobLogging");

            result.setCreatedBy(DfTypeUtil.toString(source.get("createdBy")));
            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));
            result.setCronExpression(DfTypeUtil.toString(source.get("cronExpression")));
            result.setJobLogging(DfTypeUtil.toBoolean(source.get("jobLogging")));
            result.setName(DfTypeUtil.toString(source.get("name")));

                "createdTime");
        setupEpg(_epgMap, et -> ((ScheduledJob) et).getCronExpression(),
                (et, vl) -> ((ScheduledJob) et).setCronExpression(DfTypeUtil.toString(vl)), "cronExpression");
        setupEpg(_epgMap, et -> ((ScheduledJob) et).getJobLogging(),
                (et, vl) -> ((ScheduledJob) et).setJobLogging(DfTypeUtil.toBoolean(vl)), "jobLogging");