https://codereview.appspot.com/67910048/diff/20001/.settings/com.google.appen... File .settings/com.google.appengine.eclipse.core.prefs (right): https://codereview.appspot.com/67910048/diff/20001/.settings/com.google.appen... .settings/com.google.appengine.eclipse.core.prefs:6: gaeLaunchAppInBrowser=true revert this change in hg https://codereview.appspot.com/67910048/diff/20001/src/main/webapp/jsp/instru... File src/main/webapp/jsp/instructorCourseStudentEdit.jsp (right): https://codereview.appspot.com/67910048/diff/20001/src/main/webapp/jsp/instru... src/main/webapp/jsp/instructorCourseStudentEdit.jsp:13: } You can do this in the Action. If there's no email conflict just assign newEmail as the student's email