JAX-WS Tools provides a context aware Annotation properties view that reacts to the selection in the Java Editor presenting a list of applicable JAX-WS annotations for that selection.
Selecting or deselecting a check box in the values column will add or remove the annotation at that row to the currently selected Java element in the Java Editor
Expanding an annotation in the view will reveal the annotations elements and the element values.
You can edit the annotation element values using the editors in the values column.
The Annotation Properties view is available under
Window > Show View > Other... > Web Services > Annotation Properties from the top level menu.