FRM 10142 : HTTP Listner is not running at port 8889.

Hi Friends, It is a common problem when we are working with Form, oftenly every newbie user face these type of prob. and ofcourse I was  also one of you, I also got rid of to face the same, now can't see you bother anymore, so here we go for the solution :-
Click on start - All programs - Oracle Developer Suite - Form Developer - Start OC4J Instatnce.

Okay, Best of Luck.

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