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Struts2 + Hibernate

 
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Hi i am using Hibernate to insert bulk records/ query bulk records at a time.

All works well but suddenly after some time error comes up saying that cannot open connection/TNS listener not listening in the middle of the application.
What does it mean?


Error i get is :



My program is like this, this function is called in a loop more than 1000 times,however i get error at the 10th row if i use Oracle 10g XE,
and on around 100th row if i use Oracle 10g.
All previous take out coorect data/ insert data in database.but after some time this error creeps in




Please suggest what is going wrong.
 
Ivar sol
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And i am using Tomcat 6 server
 
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