What are the Disadvantages of Hibernate?

There are following Disadvantages of Hibernate :-

• Since hibernate generates lots of SQL statements at runtime so it is slower than pure JDBC.
• If there are lot of mappings and joins among the tables, then code will be more complex for understanding.
• A lot of effort is required to learn Hibernate. So, not very easy to learn hibernate easily.
• Hibernate does not support some type of queries like inside same table we can not insert mutliple objects using same query.it is supported by JDBC.
• If there are small project with less number of table then we need to setup entire hibernate framework for using.
• In Hibernate everything is returned as a object type.      
• Sometimes debugging and performance tuning becomes difficult in Hibernate.