Unreported error

Question

plese tell this one,
Unreported exception java.lang.class not found exception must be caught or declared to be thrown
          Class.forName("org.postgresql.Driver");
Unreported exception java.sql.sqlexceptionexception must be caught or declared to be thrown
          con = DriverManager.getConnection("jdbc:postgresql://localhost/wsms","postgres","postgres");

Answer 1

Details here:
http://java.sun.com/docs/books/tutorial/essential/exceptions/
Overview:
The base class for all exceptions is Throwable. Java provides Exception and Error that extend Throwable. RuntimeException (and many others) extend Exception.
RuntimeException and its descendants, and Error and its descendants, are called unchecked exceptions. Everything else is a checked exception.
If your method, or any method it calls, can throw a checked exception, then your method must either catch that exception, or declare that your method throws that exception. This way, when I call your method, I know at compile time what can possibly go wrong and I can decide whether to handle it or just bubble it up to my caller. Catching a given exception also catches all that exception's descendants. Declaring that you throw a given exception means that you might throw that exception or any of its descendants.
Unchecked exceptions (RuntimeException, Error, and their descendants) are not subject to those restrictions. Any method can throw any unchecked exception at any time without declaring it. This is because unchecked exceptions are either the sign of a coding error (RuntimeException), which is totally preventable and should be fixed rather than handled by the code that encounters it, or a problem in the VM, which in general can not be predicted or handled.