Problem when executing query

[ataud]

I have this EJB Session :

@Stateless
@Remote(Paulva.class)
public class PaulvaBean implements Paulva {

....

/**
* Gestionaire de persistence
*/
@PersistenceContext(unitName="paulva")
protected EntityManager entityManager;

public boolean authenticate(String pseudo, String password) {
if (log.isDebugEnabled()) {
log.debug("START " + getClass() + ".authenticate");
}

boolean isValid= false;

if (check(pseudo,MIN_PSEUDO_SIZE,MAX_PSEUDO_SIZE) && check(password,MIN_PASSWORD_SIZE,MAX_PASSWORD_SIZE)) {

if (log.isDebugEnabled()) {
log.debug("pseudo="+pseudo+" checked.");
}

// définition de la requête
Query query=entityManager.createQuery("SELECT a FROM Ancien a WHERE a.pseudo = :pseudo AND a.password = :password");

// Substitution des paramètres de la requête
query.setParameter("pseudo",pseudo);
query.setParameter("password",password);

// Exécution de la requete
AncienEntity ancien=(AncienEntity)query.getSingleResult();
isValid=ancien!=null;
}

if (log.isDebugEnabled()) {
log.debug("END " + getClass() + ".authenticate");
}
return isValid;
}

private boolean check(String value,int min,int max) {
return (value!=null)&&(value.length()>=min)&&(value.length()<=max);
}

.....
}


but when I execute the query bellow
...
AncienEntity ancien=(AncienEntity)query.getSingleResult();
...

I have this error in log:
2006-01-08 18:17:45,326 INFO security.JaccHelper - Initialising JACC Context for deployment: paulva-bus.jar
2006-01-08 18:17:45,405 INFO ejb3.Ejb3AnnotationHandler - found EJB3: ejbName=com.paulva.business.PaulvaBean, class=com.paulva.business.PaulvaBean, type=STATELESS
2006-01-08 18:17:45,748 INFO security.JaccHelper - com.paulva.business.PaulvaBean has no @SecurityDomain - skipping JACC configuration
2006-01-08 18:17:45,826 INFO ejb3.Ejb3Deployment - Found persistence.xml file in EJB3 jar
2006-01-08 18:17:46,530 INFO ejb3.Ejb3Deployment - Create EntityManager with JNDI name: paulva
2006-01-08 18:17:46,530 INFO security.JaccHelper - JACC Policy Configuration for deployment has been put in service
2006-01-08 18:17:46,530 INFO ejb3.Ejb3Deployment - EJB3 deployment time took: 1204
2006-01-08 18:17:46,951 INFO ejb3.ProxyDeployer - no declared remote bindings for : com.paulva.business.PaulvaBean
2006-01-08 18:17:46,951 INFO ejb3.ProxyDeployer - there is remote interfaces for com.paulva.business.PaulvaBean
2006-01-08 18:17:46,951 INFO ejb3.ProxyDeployer - default remote binding has jndiName of com.paulva.business.Paulva
2006-01-08 18:17:47,108 INFO ejb3.EJB3Deployer - Deployed: file:/C:/java/jboss-4.0.3SP1/server/all/deploy/paulva-bus.jar
2006-01-08 18:18:11,280 DEBUG business.PaulvaBean - START class com.paulva.business.PaulvaBean.authenticate
2006-01-08 18:18:11,280 DEBUG business.PaulvaBean - END class com.paulva.business.PaulvaBean.authenticate
2006-01-08 18:18:11,358 DEBUG business.PaulvaBean - START class com.paulva.business.PaulvaBean.authenticate
2006-01-08 18:18:11,358 DEBUG business.PaulvaBean - pseudo=PSEUDO0 checked.
2006-01-08 18:18:11,842 ERROR socket.ServerThread - failed
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:235)
at java.io.ObjectInputStream$PeekInputStream.peek(ObjectInputStream.java:2200)
at java.io.ObjectInputStream$BlockDataInputStream.readBlockHeader(ObjectInputStream.java:2380)
at java.io.ObjectInputStream$BlockDataInputStream.refill(ObjectInputStream.java:2447)
at java.io.ObjectInputStream$BlockDataInputStream.read(ObjectInputStream.java:2519)
at java.io.ObjectInputStream$BlockDataInputStream.readByte(ObjectInputStream.java:2668)
at java.io.ObjectInputStream.readByte(ObjectInputStream.java:864)
at org.jboss.remoting.transport.socket.ServerSocketWrapper.checkConnection(ServerSocketWrapper.java:54)
at org.jboss.remoting.transport.socket.ServerThread.acknowledge(ServerThread.java:217)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:298)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:169)