Need suggestion for a database connection issue in an EJB Application

Hi Friends,
I am facing some serious problem in my EJB application. Some times, my application is waiting for unknown reason while it connects to database as executing a stored procedure to get and assign a unique number to a transaction.
This stored procedure is used to get a unique number from database and update the database with the new unique number which is incremented by previous number.
During this waiting time, if any other transaction hits my application, then my application assigning same unique number to these 2 transactions.
But It is not happening always. It is happening very less number of times. What should I take care of the code to not happen this? Can I implement any synchronization kind of thing here?
If I implement synchronization kind of thing, If the first transaction gets the lock and waits for some time, then I think it will effect for subsequent transactions. Could You please suggest me on this issue?
Thanks in Advance to All.

Here is my datasources.xml :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
     <bean id="myDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
          <property name="jndiName" value="jdbc/myDS"/>
          <property name="resourceRef" value="false"/>
     </bean>
</beans>

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This question was solved.
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I suggest joining the Enterprise Buisness forum and posting your query there.
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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