I wrote some custom composite widgets for a project and compiled them into a separate jar file. I added this jar file to the build path for the GWT project. When I try to add the widgets to the palette (by pressing the "Choose component" button), I can pick the composite widget's class in the list, but I get the following error:
WindowBuilder was unable to load com.test.common.ui.LocationBox. This may be caused by ClassLoader problems. Do you want to refresh editor and try again?
What am I doing wrong here? Is there something I need to add to the jar to make it load properly?
Sometimes the GWT Designer does not pick up changed classes or is not able to find them. I would recommend to a full rebuild using the menu "Project->Clean" and then closing and reopening the designer. If this does not help, try a restart of eclipse before reopening the designer.