Craig,
Thanks for the insight, you hit it right on the head!!!
-------------------------------------------------------------------------
James C. Bragg
Senior Software Consultant
Computer Associates International Inc
> -----Original Message-----
> From: Craig R. McClanahan [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, July 03, 2000 4:15 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Casing ConnectionPool Exception from ServletContext &&
> StackOverflowError Exception
>
> A StackOverflow exception is usually caused by a recursive call in your
> code
> that keeps calling itself and calling itself until it runs out of room.
> In your
> particular case, this seems to be happening at line 37 of the
> ConnectionPool
> class. Check the code there to see why it keeps calling itself instead of
> returning an instance value.
>
> Craig McClanahan
>
>
>
> "Bragg, James" wrote:
>
> > I have my ConnectionPool object stored into my ServletContext; however,
> I
> > get an ClassCastException:
> >
> > pool = (ConnectionPool)getServletContext().getAttribute("pool");
> >
> > Then, I tried writing ConnectionPool object to use an instance of itself
> > instead of the object itself; however, now I get an exception in my
> > StartupServlet loading my ConnectionPool instance
> >
> > (ConnectionPool object)
> > ...
> > protected static ConnectionPool instance;
> >
> > private ConnectionPool ( )
> > throws SQLException, ClassNotFoundException {
> >
> > // Load the specified driver class
> > Class.forName( ... );
> > connections = new Hashtable ();
> >
> > // Put our pool of Connections in the Hashtable
> > // The FALSE value indicates they are unused.
> >
> > for (int i = 0; i < initialConnections; i++) {
> > connections.put (DriverManager.getConnection(dbURL, user,
> > password), Boolean.FALSE);
> >
> > }
> > }
> >
> > public static ConnectionPool getinstance() {
> > if (instance == null){
> > instance = ConnectionPool.getinstance();
> > }
> > return instance;
> > }
> > ...
> >
> > (StartupServlet init )
> > ...
> > public void init (ServletConfig config) throws ServletException
> {
> >
> > super.init(config);
> > context = config.getServletContext();
> >
> > try {
> > // Load the JDBC driver and register it
> > pool = ConnectionPool.getinstance ();
> > }
> >
> > catch(Exception e) {
> > throw new UnavailableException (this, "Could not create
> > connection pool");
> > }
> > }
> > ...
> >
> > So now I'm getting:
> >
> > [03/Jul/2000:15:02:59] failure ( 190): Internal error: unexpected
> exception
> > thrown from the servlet init function (servlet class=StartupServlet):
> > java.lang.StackOverflowError, Stack: java.lang.StackOverflowError
> > at java.io.PrintStream.println(PrintStream.java:551)
> > at ConnectionPool.getinstance(ConnectionPool.java:36)
> > at ConnectionPool.getinstance(ConnectionPool.java:37)
> > .... (about 60+ more of the above line..)
> > at ConnectionPool.getinstance(ConnectionPool.java:37)
> > at ConnectionPoo[03/Jul/2000:15:02:59] warning ( 190): Internal
> > error: Failed to load servlet (servlet=StartupServlet)
> >
> > Any ideas or suggestion would be greatly appreciated.
> >
> >
> -------------------------------------------------------------------------
> > James C. Bragg
> > Senior Software Consultant
> > Computer Associates International Inc
> >
> >
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