this does not work for me because I do not have the classpath environment variable set up correctly. Can someone help me with detailed instructions on how to do this? I know where to find the environment variables, however, I am not sure if they should be named CLASSPATH and also what should be in the value for the CLASSPATH variable.
Helpful hint: use the "Code" button to get the message editor to wrap special tags around your code/xml that will keep it from getting mangled.
I don't have any idea how CLASSPATH is supposed to apply to what you're asking, however. A dataTable works by referencing a DataModel object that manages the rows to be displayed. The DataModel object is a property of a backing bean.
Normally, the datamodel object is constructed by the backing bean and backing beans are (by definition) part of the classpath of a JSF app. So no special peeking into environments or whatever is required. Not that it's a good idea for webapps to use environment variables anyway.
Sometimes the only way things ever got fixed is because people became uncomfortable.