Help me with this Design   

I am assigned to create an application (part of a bigger one) which would automate certain process. Basically what the application does is select records from DB and do certain operation on data then connect to a third party site and post the data there. Now we have more than one external vendor to connect to and the data has to processed accordingly, also the DB is populated by external entries. What I am planning to do is
1. Poll the Db at regular interval (1 sec as the response has to be fast)
2. Create Message listeners for each Vendor.
3. Push the data retrieved from DB in JMS using point to point messaging because the listener can to down and we need to persist the data.
4. The listener requests a thread (containing a proprietary workflow) from the thread manager, passes the data to it and executes it. Multithreading is added as there may be many incoming requests and processing each approx 1 min, and we need a really fast system.
This would be deployed in Tomcat on windows machine. Can anyone please point me the mistakes/loopholes in above solution, or suggest a better solution.