To be changed

• Currently, error handling is not very robust. If there is an error in the xbook on the xbook manager (e.g., syntax error in a script), the portlet returns nothing. It should report the error that the xbook manager caught.
• When viewing a xbook, the user can click on the 'back to xbook' or 'start over' buttons. This means they are exiting the xbook so we should call the xbook manager's shutDown method.

• The browsing aspects of the portlet are kind of clunky (especially with respect to viewing subxbooks) and could stand for some improvement. One thing that really needs to be changed is the location of the 'View output' button. It needs to be moved to the 'View xbook' screens where currently the navigation buttons are Submit, Back to xbook, and Start Over (see Figure 3.3). Since we can grab the number of pages of output this xbook has (see Section 2.3.0.1) from the properties file, we can display them as a page navigation bar. For example, just as you would see at the bottom of a google results page: $<$previous$>$ 1 2 3 4 $<$next$>$. Thus if the user just wants to page through the output, it's easy to do. And if one of the pages is a monitoring job page, the user can just click Submit and get the updated results.