How to make sure quartz.properties is being used?

For those who are using Spring + Quartz and quartz.properties file is not working (i.e. gets ignored while starting the application):

Quartz Scheduler (org.quartz.Scheduler) instantiated by Spring Factory Bean (org.springframework.scheduling.quartz.SchedulerFactoryBean) won't read quartz.properties file from the classpath by default as it's said in Quartz docs - you need to set the reference manually:

[in case of Java config]:

@Bean
public SchedulerFactoryBean schedulerFactoryBean() {
    SchedulerFactoryBean schedulerFactoryBean = new SchedulerFactoryBean();
    schedulerFactoryBean.setConfigLocation(new ClassPathResource("quartz.properties"));
    // ...
}

[in case of XML config]:

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
    <property name="configLocation" value="classpath:quartz.properties" />
    // ...
</bean>

oops, I found the problem, actually the code was overriding the properties file config by creating an instance of Properties class in the code. so the answer is this line:

sf = new StdSchedulerFactory("conf/quartz.properties");