I have mappings like this:
public class Foo {

private Long id;
private Map barMap;
...//getters, setters
}

public class Bar {

private Long id;
private String name;
}

with class Foo, the key of barMap is an object of Bar, and the value is a Date.
<hibernate-mapping>
<class name="Bar">

...
</class>
<class name="Foo">
...
<map name="barMap" table="barMapTable">
<key column="fooId"/>
<index-many-to-many class="Bar" column="barId"/>
<element column="barDate" type="java.util.Date"/>
</map>
</class>
</hibernate-mapping>
so I want to get all Bars object from Foo with a condition of specified Date, how to write the HQL?
Like this?
"select indices(foo.barMap) from Foo foo, foo.barMap barDate where barDate = new Date() ";
I find "indices(foo.barMap)" will join a table such as barMapTable, and "from Foo foo, foo.barMap" will join the table "barMapTable" with another alias, so "indices(foo.barMap)" hasn't any relation with "foo.barMap".

elements()

elements() will extract the value of the map, but I want the key from the map.

I met the same question these days, ....

put a <parent...> tag in the composite-element section can solve this problem