The org/eclipse/jpt/common/utility/internal/StatefulCommandExecutor class is included in the org.eclipse.jpt.common.utility plugin, version 2.0.x that is part of WTP 3.3.x.
This class has been renamed to org.eclipse.jpt.common.utility.command.StatefulCommandExecutor in the org.eclipse.jpt.common.utility plugin, version 2.1.0 which is part of WTP 3.4.0
In order to check the version of this plugin, you can do the following:
- open the Console View
- select Host OSGi Console from the view's context menu
- enter ss org.eclipse.jpt.common.utility