What are the ways to express joins in HQL?

What are the ways to express joins in HQL?

HQL provides four ways of expressing (inner and outer) joins:-

·         An implicit association join

·         An ordinary join in the FROM clause

·         A fetch join in the FROM clause.

·         A theta-style join in the WHERE clause.

How can Hibernate be configured to access an instance variable directly and not through a setter method?  By mapping the property with access="field" in Hibernate metadata.

How can a whole class be mapped as immutable?

Mark the class as mutable="false" (Default is true). This specifies that instances of the class are not mutable. Immutable classes, may not be updated or deleted by the application.