Petit problème sur les champs reconnus comme identifiant

Bonjour,

j'ai mappé une table d'utilisateurs t_user de la façon suivante :

Code:

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<class name="pelican.domain.model.User" table="t_user">
		<cache usage="read-write" />
 
                <id name="id" type="long" column="u_id">
			<generator class="sequence">
                            <param name="sequence">t_user_id_seq</param>
                        </generator>
		</id>
 
                <property name="login" column="u_login" />
                <property name="password" column="u_password" />
             </class>

Comme vous le voyez, j'utilise une séquence pour renseigner mon id.
Maintenant, quand je veux chercher un utilisateur dans la base, je le recherche par son login et non par son id, ça a un coté pas pratique :D :

Code:

user = (User) this.getHibernateTemplate().get(User.class, login);

et la forcément ça lève une exception :

Code:

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org.hibernate.TypeMismatchException: Provided id of the wrong type. Expected: class java.lang.Long, got class java.lang.String
        at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:86)
        at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
        at org.hibernate.impl.SessionImpl.get(SessionImpl.java:815)
        at org.hibernate.impl.SessionImpl.get(SessionImpl.java:808)
        at org.springframework.orm.hibernate3.HibernateTemplate$1.doInHibernate(HibernateTemplate.java:477)
        at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:373)
        at org.springframework.orm.hibernate3.HibernateTemplate.get(HibernateTemplate.java:471)
        at org.springframework.orm.hibernate3.HibernateTemplate.get(HibernateTemplate.java:465)
        at pelican.domain.dao.hibernate3.UserDAOHibernate.getUser(UserDAOHibernate.java:23)
        at pelican.service.impl.UserManagerImpl.findUser(UserManagerImpl.java:81)
        at pelican.service.impl.UserManagerImpl.canLogin(UserManagerImpl.java:95)
        at pelican.web.WelcomeAction.execute(WelcomeAction.java:38)
        at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:110)
        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)

ma question est la suivante, comment faire pour lui spécifier qu'il faut faire une recherche sur le champ `u_login` et non pas le champ u_id ?