Hi,

Can anyone explain what is the main difference between these two cache and when we used each one.

Pls reply....

Thanks,
Pavan

Hi,

first level cache is the Hibernate session (or the JPA persistence context), you're using this automatically so the more important cache is the socalled 2nd level cache.
This one is independend from a session and sits between the 1st level cache and the database.
Apart from that google is your friend, see e.g. this somewhat old but still valid introduction http://www.javalobby.org/java/forums/t48846.html
or the official documentation: http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html/performance.html#performance-cache

Robin.

Thanks 4 ur reply.....