1) Create Hibernate Console Configuration with "Database connection" with some Eclipse Connection Profile & "Property file" field should be empty;
2) Create some Hibernate Codegen config which is use prev. Hibernate Console Config.;
3) Export Codegen config created at step 2 to Ant codegen script;

properties file content look like this:
hibernate.connection.driver_class=${hibernate.connection.driver_class}
hibernate.connection.url=${hibernate.connection.url}
hibernate.connection.username=${hibernate.connection.username}
hibernate.connection.password=${hibernate.connection.password}
hibernate.dialect=${hibernate.dialect}

• this is wrong.