Hi, wt team.
There is a memory leak in wt.
You need to declare WApplication destructor virtual.
Otherwise you'll have memleak in applications that inherit from WApplication, like treeview-dragdrop example.
Patch attached.
--- src/Wt/WApplication.orig    2012-04-12 21:16:33.860000001 +0000
+++ src/Wt/WApplication 2012-04-12 21:16:39.080000001 +0000
@@ -230,7 +230,7 @@ public:
    * The destructor deletes the root() container, and as a consequence
    * the entire widget tree.
    */
-  ~WApplication();
+  virtual ~WApplication();
 #endif // WT_TARGET_JAVA
 
   /*! \brief Returns the current application instance.
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