title: Interrupt spring scheduler task before next invocation
body: <p>I have a Spring-Boot application which is going to be an orchestration service for several other processes we want to trigger.  I have it currently set up using Spring Scheduling pulling crons dynamically from a database.  I threw in a rest method to trigger the process to pull new cron information from the database.  This logic all works correctly.  The only "issue" is that it doesn't use the new cron information until the next scheduled run which gets to the real question.  <strong>Is there a way to interrupt the current Trigger and schedule one again using the updated cron information.</strong>  Here is the application for reference:</p>
  
  <pre><code>package com.bts.poc;
  
  import org.apache.log4j.Logger;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.scheduling.Trigger;
  import org.springframework.scheduling.TriggerContext;
  import org.springframework.scheduling.annotation.EnableScheduling;
  import org.springframework.scheduling.annotation.SchedulingConfigurer;
  import org.springframework.scheduling.config.ScheduledTaskRegistrar;
  import org.springframework.scheduling.support.CronTrigger;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.RestController;
  
  import java.util.Date;
  
  @SpringBootApplication
  @EnableScheduling
  @RestController
  @RequestMapping("/APSCommon/Scheduling")
  public class Application implements SchedulingConfigurer {
  
      @Autowired
      private DynamicCron dynamicCron;
      @Autowired
      PropertyManager propertyManager;
  
      public static void main(String[] args) throws Exception {
          SpringApplication.run(Application.class);
      }
  
      private String cronConfig() {
          String cronTabExpression = propertyManager.getProperty("COMPANY", "JOB_NAME","CRON_EXPRESSION");
          return cronTabExpression;
      }
  
      @Override
      public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
          taskRegistrar.addTriggerTask(new Runnable() {
              @Override
              public void run() {
                  dynamicCron.runJob();
              }
          }, new Trigger() {
              @Override
              public Date nextExecutionTime(TriggerContext triggerContext) {
                  String cron = cronConfig();
                  CronTrigger trigger = new CronTrigger(cron);
                  Date nextExec = trigger.nextExecutionTime(triggerContext);
                  DynamicCron.cronExpression = cron;
                  return nextExec;
              }
          });
      }
  
      @RequestMapping(value = "/reloadScheduling", method = RequestMethod.GET)
      public String reloadScheduling() {
          PropertyManager.setResetProperties(true);
          return "schedules will be altered next run";
      }
  }
  </code></pre>