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What is meant by persistence unit?

 
gurpeet singh
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please refer the following URL http://www.javaworld.com/javaworld/jw-10-2008/jw-10-ejb3.html?page=4. an excerpt from it is as follows

For persistence, you need a JPA deployment descriptor named persistence.xml.
Injecting the EntityManager without specifying the persistence unit works only if a single persistence unit is specified in persistence.xml,


i read the whole article, but i do not understand what is a PERSISTENCE UNIT?
 
Jeanne Boyarsky
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A persistence unit is a grouping of JPA entities. This serves as a nice review of the terms.
 
gurpeet singh
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Thank you so much Jeanne
 
Don't get me started about those stupid light bulbs.
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