title: Resources plugin in grails gives error on file delete?
body: <p>I am using Groovy on Grails and the resources plugin is configured.
  I have this scenario:</p>
  
  <ul>
  <li><p>I have a product, which has multiple images.</p></li>
  <li><p>The admin can delete any image.</p></li>
  </ul>
  
  <p>The logic is that when the admin clicks "Delete", I remove the file (and its thumb file) from the file system.</p>
  
  <p>The whole process works smoothly, but after some time (5-6 minutes), when the resources plugin once again refreshes its resources, it throws an error saying that, "some module depends on resource [path/to/file] but the file was not found". </p>
  
  <p>The stack trace is as follows:</p>
  
  <pre><code>2012-08-10 12:49:41,159 [http-8080-2] ERROR errors.GrailsExceptionResolver  - Exception occurred when processing request: [GET] /
  Stacktrace follows:
  org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag &lt;r:layoutResources&gt;: Module [__@adhoc-files@__] depends on resource [/images/product/p312roduct/original/Candle_4.jpg] but the file cannot be found at /home/desktop2/finalWorkspace3/ds/grails-app/views/layouts/main.gsp:13
      at home_desktop2_finalWorkspace3_ds_grails_app_views_layouts_main_gsp$_run_closure1.doCall(main.gsp:13)
      at home_desktop2_finalWorkspace3_ds_grails_app_views_layouts_main_gsp$_run_closure1.doCall(main.gsp)
      at home_desktop2_finalWorkspace3_ds_grails_app_views_layouts_main_gsp.run(main.gsp:17)
      at org.grails.plugin.resource.DevModeSanityFilter.doFilter(DevModeSanityFilter.groovy:44)
      at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:197)
      at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:171)
      at java.lang.Thread.run(Thread.java:679)
  Caused by: java.lang.IllegalArgumentException: Module [__@adhoc-files@__] depends on resource [/images/product/p312roduct/original/Candle_4.jpg] but the file cannot be found
      at org.grails.plugin.resource.ResourceTagLib$_closure8.doCall(ResourceTagLib.groovy:463)
      at org.grails.plugin.resource.ResourceTagLib.invokeMethod(ResourceTagLib.groovy)
      at org.grails.plugin.resource.ResourceTagLib$_closure6.doCall(ResourceTagLib.groovy:387)
      ... 7 more
  2012-08-10 12:49:41,172 [http-8080-2] ERROR pages.GroovyPagesServlet  - Error processing GSP: Error executing tag &lt;r:layoutResources&gt;: Module [__@adhoc-files@__] depends on resource [/images/product/p312roduct/original/Candle_4.jpg] but the file cannot be found at /home/desktop2/finalWorkspace3/ds/grails-app/views/layouts/main.gsp:13
  org.codehaus.groovy.grails.web.taglib.exceptions.GrailsTagException: Error executing tag &lt;r:layoutResources&gt;: Module [__@adhoc-files@__] depends on resource [/images/product/p312roduct/original/Candle_4.jpg] but the file cannot be found at /home/desktop2/finalWorkspace3/ds/grails-app/views/layouts/main.gsp:13
      at home_desktop2_finalWorkspace3_ds_grails_app_views_layouts_main_gsp$_run_closure1.doCall(main.gsp:13)
      at home_desktop2_finalWorkspace3_ds_grails_app_views_layouts_main_gsp$_run_closure1.doCall(main.gsp)
      at home_desktop2_finalWorkspace3_ds_grails_app_views_layouts_main_gsp.run(main.gsp:17)
      at org.grails.plugin.resource.DevModeSanityFilter.doFilter(DevModeSanityFilter.groovy:44)
      at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:197)
      at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:171)
      at java.lang.Thread.run(Thread.java:679)
  Caused by: java.lang.IllegalArgumentException: Module [__@adhoc-files@__] depends on resource [/images/product/p312roduct/original/Candle_4.jpg] but the file cannot be found
      at org.grails.plugin.resource.ResourceTagLib$_closure8.doCall(ResourceTagLib.groovy:463)
      at org.grails.plugin.resource.ResourceTagLib.invokeMethod(ResourceTagLib.groovy)
      at org.grails.plugin.resource.ResourceTagLib$_closure6.doCall(ResourceTagLib.groovy:387)
      ... 7 more
  </code></pre>