Help required to create portal without using any vendor specific API's

Hi All,
I am trying to develope a portal without using any vendor specific API or tool like Weblogic workshop or Vignette Wizard. I would like to know whether Sun Microsystem provides any API for developing portal. I would also appreciate if I can get few links for developing portal using java API's...
Thanks in advance...
Dgk

Sure Sun provides the tools: it is called the compiler. Now all you need to do is write the code for a portal. But since there are vendor specific solutions available that could make your life a lot easier, writing one yourself is like reinventing the wheel.
Pardon my mild sarcasm, but avoiding API's not developed by Sun is not the general idea behind the Java platform. You are encouraged to use those API's.

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