i am new in hibernate please
what is the difference between org.hibernate.hql.classic.ClassicQueryTranslatorFactory and org.hibernate.hql.ast.ASTQueryTranslatorFactory

ASTQueryTranslatorFactory :
Generates translators which uses the Antlr-based parser to perform the translation.
1) Added in Hibernate 3

ClassicQueryTranslatorFactory :
Generates translators which uses the older hand-written parser to perform the translation.
1) Added in Hibernate 2.1 and in Hibernate 3 also.


ASTQueryTranslatorFactory is the new translator which parses the queries in Hibernate 3 and is by default activated.
It does not support all queries from Hibernate 2.1 if you are doing a migration . For that you can switch the translator to ClassicQueryTranslatorFactory