i created my database and I load my identity with this metho:

public void loadIdentities() {
 JbpmConfiguration jbpmConfiguration = JbpmConfiguration.getInstance();

 JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
 try {
 Entity[] entities = IdentityXmlParser
 .parseEntitiesResource("identity.db.xml");
 IdentitySession identitySession = new IdentitySession(jbpmContext
 .getSession());

 assertNotNull(identitySession);

 for (int i = 0; i < entities.length; i++) {
 identitySession.saveEntity(entities);
 }
 } finally {
 jbpmContext.close();
 }
 }

now, on an web application i want to create a login page that verify, login and password by using identities loaded