Lecture Materials WebApp Development Pt. 2 slides (PDF) Reading Assignment: HttpUnit 1.3 Documentation (also in JOSSE distribution) JSP Tutorial Java Standard Tag Library Documentation Programming Assignment (For Monday, March 4) Provide a new button called "double" in the stackmvc index.jsp page.  The double button invokes the Double command, which is implemented by the DoubleCommand class. The double command takes the current contents of the stack and doubles it. So, if the initial contents (from top to bottom) is "1 2 3", then the result of doubling is "1 2 3 1 2 3".   It is an error to try to double an empty stack, and you should print an explanatory message. You must write a TestDoubleCommand junit/httpunit test. The assignment is due on Monday. Bring a printout of a screendump illustrating your program in operation. Programming Assignment (For Wednesday, March 13) Implement a web-based interface to your accountinfo class called "accountinfoMVC.".  You must divide up into new groups of two. Use the stackMVC system as a guideline. Your system should be a client of an accountinfo.jar service. You may, of course, find that you need to modify your accountinfo ADT in response to the new requirements of the accountinfoMVC client.