java - HQL:Implicit Association joining not working -

I am using Hibernate 3.2.5 for my application.

I have a department table and a employee table

Dept.java Private Ent DPID; Private string deptName; Private map empMap = new hashmap (); // Gates and Setters

Employee. Java

  Private Imp. IPID; Private string empName; Private Ent DPID; Personal gaps ages; Private string sex; Department of Private Department; // Gates and Setters   
 Association between the two:  
  & lt; Map name = "empMap" inverse = "false" cascade = "all" & gt; & Lt; Major column = "DEPT_ID" & gt; & Lt; / Key & gt; & Lt; Map-key formula = "EMP_ID" type = "integer" & gt; & Lt; / Map-key & gt; & Lt; One-to-many classes = "com.jdbc.Employees" /> & Lt; / Map & gt;   
 When I try the following statement:  
  query hqlQuery = session.createQuery ("From the Department Department where dept.empMap.empName = 'XYZ '');   
 I get the following exception:  
  org.hibernate.QueryException: dereference collection with reference to element [dept0_.DEPT_ID.empMap] is invalid Effernames [EmpName] [com.jdbc.Dept dept from where dept.empMap.empName = 'XYZ']   
 Please know how to use the inherent login here Reading the doctor, I can not understand what I am missing.   
 
 
 You're trying to use a collection like a property you can do instead Are: Dept dept internal join dept.empMap emp from  
  where emp.empName = 'XYZ'