问题
After upgrading to Eclipse 2020-09 (4.17) in the WindowBuilder editor the Java code is shown in the Source tab (as expected), but nothing is shown in the Design tab anymore. I would expect that the graphical editor would be displayed in the Design tab, as it was the case before I did the upgrade.
回答1:
That's a known issue of the Eclipse 2020-09 release which is already fixed (see Eclipse bug 567071).
Update to WindowBuilder 1.9.4 either via the Eclipse Marketplace or via Help > Install New Software... and working with the update site http://download.eclipse.org/windowbuilder/latest/.
来源：https://stackoverflow.com/questions/64049891/why-is-the-design-tab-in-the-windowbuilder-editor-empty-in-eclipse-2020-09