clear resource bundle cache, a solution (requires Java 6)

[rehdie]

Hi all,

during development I don't want to restart the applicaction server just because a message has been added or modified. Since the resource bundles are cached, a method to clear that cache is required.

I've implemented a simple seam component, which can be used to clear the cache. Maybe this helps some other people using SEAM:

public class ClearResourcesAction extends SkilineAction
{
   private static final long serialVersionUID = 6353316361885036069L;

   public static final String COMPONENT_NAME = "clearResourcesAction";
   
   @In(SeamComponents.RESOURCE_BUNDLE)
   private ResourceBundle resourceBundle;
   
   @SuppressWarnings("unchecked")
   public void clearResources()
   {
      try
      {
         SeamResourceBundle seamResourceBundle = (SeamResourceBundle)resourceBundle;
         Field field = seamResourceBundle.getClass().getDeclaredField("bundleCache");
         field.setAccessible(true);
         Map bundleCache = (Map)field.get(resourceBundle);
         bundleCache.clear();
         SeamResourceBundle.clearCache(Thread.currentThread().getContextClassLoader());
         statusMessages.add("Resourcebundle cache cleared");
      }
      catch(Exception e)
      {
         statusMessages.add(Severity.ERROR, "Could not clear resource bundle cache: {0}", e);
      }
   }
}

The class SeamComponents defines constants for some built in seam components. SeamComponents.RESOURCE_BUNDLE is defined as org.jboss.seam.core.resourceBundle.

The static method java.util.ResourceBundle.clearCache was introduced in Java 6, so this solution doesn't work with Java 5!

regards
Dieter