database used: mySQL

Source Files used:
ConToDB.java 
ConnWrapper.java
data.java
ReturnSearchBean.java
findfile.java
modifyFile.java
Request.html
Modify.html

Test files: Try.java, dbtest.java

WebServers Running(4)
	Redirector WebServer(1):
		linuxserver1.cs.umbc.edu:10154

	Servers(3):
		atlas.csee.umbc.edu:10154
		linuxserver2.cs.umbc.edu:10154
		sunserver1.cs.umbc.edu:10154

Image files present:
filename	fileURL						ServerId
a.jpg	http://atlas.csee.umbc.edu:10154/images/a.jpg		1	
b.jpg	http://linuxserver2.cs.umbc.edu:10154/images/b.jpg	2
c.jpg	http://sunserver1.cs.umbc.edu:10154/images/c.jpg	3

http://linuxserver1.cs.umbc.edu:10154/Request.html
type complete filename into the text box and click on Submit.
if file is present then the file is returned, else "file not present" is returned.
Ex: 
type"a.jpg" for accessing a.jpg
type"list" for list of all files
type garbage to get file not present page.

http://linuxserver1.cs.umbc.edu:10154/Modify.html
Enter all the 3 fields, viz., File Name, File URL and ServerId and choose the action and click on Submit Query
Note: if Correct ServerId is not correct, then the file is NOT deleted. It should be noted that incorrect URL will
still result in file being deleted. This is so, because it is assumed that the file to be deleted will have unique name and serverId. It is not possible for 2 files to be having same name and different URL under same server.

Examples:
if 

case 1:
filename :a.jpg
fileURL:http://atlas.csee.umbc.edu:10154/images/a.jpg
ServerId:1
if remove is selected , a.jpg info is correctly removed from database.
if add is selected again, effectively meaning, 2 files are having same info which is not possible, no duplicate entry is formed.

case 2:
filename :a.jpg
fileURL:http://atlas.csee.umbc.edu:10154/images/a.jpg
ServerId:invalid number
if remove is selected: No file is deleted.
if add is selected, system assumes that there is a different server because ServerId is different and hence  adds it to database.

case 3:
filename :a.jpg
fileURL:invalid URL
ServerId:1
if remove is given: system deletes the information associated with filename: ServerId combination, which is assumed to be unique.
if add is give then, system will add the info to the database and the error will only be visible when some client asks for the file name and because of invalid URL, page not found error is returned. This is assumed to be a  manual error.