title: cron issue with "Could not resolve placeholder"
body: <p>I am working with cron in a STS web app I am developing and I am having a string format issue when trying to run the SpringMailSender on a cron timer. I am pulling the value for the cron from an external properties file and for some reason it does not seem to be liking it. Any ideas? Here is my code...</p>
  
  <pre><code>public class Timer {
  
       @Autowired
        private ApplicationContext ctx;
  
       @Autowired
          private SpringMailSender springMailSender;
  
      @Scheduled(cron="${ctx.getMessage('timer.time', null, null)}")
      public void timer()
      {
          System.out.println("timer() in Timer Class has been stepped into");
          try {
              springMailSender.sendMail();
              } catch (Exception e) {
                  e.printStackTrace();
              }
          System.out.println("Method executed on every 2nd Monday of each month. Current time is :: "+ new Date());
      }
  
  }
  </code></pre>
  
  <p>The info in the external properties file looks like this...</p>
  
  <pre><code>timer.time=0 0 8 ? 1/1 MON#2 *
  </code></pre>
  
  <p>the error I am getting is this...</p>
  
  <pre><code>"java.lang.IllegalStateException: Encountered invalid @Scheduled method 'timer': Could not resolve placeholder 'ctx.getMessage('timer.time', null, null)' in string value "${ctx.getMessage('timer.time', null, null)}"
  </code></pre>