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Difference betn ServletException and Unavailable Exception

 
Chhaya Dhanani
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Hi all,
Pls let me know the differnece between ServletException and UnavailableException?
and also under what circumstances will these exceptions occur?
Thanx in adv
Chhaya
 
William Brogden
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ServletException is a general exception that the servlet container will catch and log. The cause can be anything you define. The exception may contain a root cause exception.
UnavailableException is derived from ServletException and has the specific meaning that the servlet is not presently available. This may be temporary or permanent. The servlet container should send a 503 error code as a response. Your servlet might throw a UnavailableException if a database was temporarily off-line.
Bill
 
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