Question

I am pretty sure that this worked before, but eclipse says there is error with it in throw line.

 try{}
}catch(Exception e){
    throw e;    }

In my old student project I wrote :

 try {
        Class.forName("org.postgresql.Driver");
        this.connection = DriverManager.getConnection(
                DataSource.getURL(), DataSource.getUserName(), DataSource.getPassword());
    } catch (ClassNotFoundException e) {
        System.out.println("Could not find driver to connect to database. Please make"
                + "sure the correseponding postgreSQLjdbc library is added.");
        throw e;

    } catch (SQLException e) {
        System.out.println("Username or password is not correct");
        throw e;
    }

and it was perfect.

Only this type works, but it is not what I want

 throw new UnsupportedAddressTypeException();

Answer 1

Presumably your method is declared to throw UnsupportedAddressTypeException but not SQLException and ClassNotFoundException. Checked exceptions can only be thrown (including rethrowing an existing one) from methods which declare that they throw those exceptions or a superclass.