What is the difference between system.out ,system.err and system.in?
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What are the call back methods in entity bean?
What are the types of scaling?
What are synchronized methods and synchronized statements?
Is jvm a overhead?
difference between HashMap, Hashset and hashTable?
What are callback interfaces?
Explain about local interfaces.
whether the connectionpooling used in struts?
whats is mean by filter?
what is Bootstrap loader program?
Why use a datasource when you can directly specify a connection details? (in a J2EE application)
is servlet,struts are threadsafe or not.please telme correct answer