The Classes folder is not visible in the Web-inf directory

Today, the project built by eclipse3.2 is migrated to eclipse3.5, and the Classes folder is not visible in the Web-inf directory, but it is in workspace and is hidden in eclipse.

Some of the online said that only in the resources view will show, I changed to Resource view, still not, and some say with navigator view, when I select Resource View,

And then in the menu Window-show view-Find the Navigator views but can not find.

I first switched to the Java view, or Java EE View, and then found the Navigator view under the menu Window-show, and the Classes folder was finally visible. The Classes folder is not visible under Project Explorer and package Explorer views.