Catch the exception you get when you try to read from a cache with an invalid state, and re-throw a more helpful error message

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@19127 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/cache/EhCacheAdapter.java

@@ -88,6 +88,13 @@ public class EhCacheAdapter<K extends Serializable, V extends Object>
                 return null;
             }
         }
+        catch (IllegalStateException ie)
+        {
+           throw new AlfrescoRuntimeException("Failed to get from EhCache as state invalid: \n" +
+                 "  state: " + cache.getStatus() + "\n" +
+                 "   key: " + key,
+                 ie);
+        }
         catch (CacheException e)
         {
             throw new AlfrescoRuntimeException("Failed to get from EhCache: \n" +