cronExpression 0 * * * *?
<p>please tell me the meaning of "0 * * * * ?" at cronExpression.</p>

<pre><code>&lt;bean id="batchJobTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean"&gt;
    &lt;property name="jobDetail" ref="batchJobDetail"/&gt;    
    &lt;property name="cronExpression"&gt;
        &lt;value&gt;0 * * * * ?&lt;/value&gt;
    &lt;/property&gt;
&lt;/bean&gt;
</code></pre>