如何实现自定义登录失败提示信息

package com.sunsheen.jfids.dsi.sysman.security.login;
  
import java.util.List;
import java.util.Map;
  
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
  
import org.hibernate.Query;
import org.hibernate.transform.Transformers;
import org.jboss.seam.security.Identity;
import org.jboss.seam.web.IdentityRequestWrapper;
import org.osoa.sca.annotations.Reference;
  
import com.sunsheen.jfids.dsi.sysman.department.Ts_department;
import com.sunsheen.jfids.dsi.sysman.security.login.authgroup.Role;
import com.sunsheen.jfids.system.base.composite.dao.IDao;
import com.sunsheen.jfids.system.base.composite.data.query.QueryParameterImpl;
import com.sunsheen.jfids.system.security.login.ILogin;
import com.sunsheen.jfids.system.sysman.ISysUser;
  
public class LoginImpl implements ILogin {
  
    IDao dao;
  
    @Reference
    public void setDao(IDao dao) {
        this.dao = dao;
    }
  
    @Override
    public ISysUser doLogin(Identity identity, Map data) {
          
         FacesContext.getCurrentInstance().addMessage(
                    null,
                    new FacesMessage(FacesMessage.SEVERITY_ERROR, "用户名密码错误55",
                            "谁也不知道是什么问题这是详细描述信息"));
           
        SysUser currUser = new SysUser();
        if (FacesContext.getCurrentInstance() != null) {
            currUser.getInfo().put(
                    "request",
                    ((IdentityRequestWrapper) FacesContext.getCurrentInstance()
                            .getExternalContext().getRequest()).getRequest());
            currUser.getInfo().put(
                    "ip",
                    ((IdentityRequestWrapper) FacesContext.getCurrentInstance()
                            .getExternalContext().getRequest()).getRequest()
                            .getRemoteAddr());
        }
        Query query = dao
                .getSession()
                .createSQLQuery(
                        "select * from SV_USERDEPART where account=:account and password=:password");
        data.put("account", identity.getCredentials().getUsername());
        MD5 m = new MD5();
        data.put("password",
                m.getMD5ofStr(identity.getCredentials().getPassword()));
        QueryParameterImpl qp = new QueryParameterImpl();
  
        query = qp.initParameter(query, data);
        query.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
        List userDataList = (List) query.list();// 涉及到多部门，就会有多条记录
        if (userDataList.size() > 0) {
            for (int i = 0; i < userDataList.size(); i++) {
                Map userData = (Map) userDataList.get(i);
                if (i == 0) {
                    currUser.setAccount((String) data.get("USERNAME"));
                    currUser.setId((String) userData.get("ID"));
                    currUser.setMemo((String) userData.get("MEMO"));
                    currUser.setEmpid((String) userData.get("EMPID"));
                    currUser.setUsername((String) userData.get("USERNAME"));
                    currUser.setSexname((String) userData.get("SEXNAME"));
                    currUser.setAccount((String) userData.get("ACCOUNT"));
                    currUser.getInfo().put("SKIN", userData.get("SKIN"));
                    data.clear();
                    data.put("id", currUser.getId());
                    Query roleQuery = dao.getSession().createSQLQuery(
                            "select * from SV_USERROLE where userid=:id");
                    roleQuery = qp.initParameter(roleQuery, data);
                    roleQuery
                            .setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
                    List<Map<String, String>> roleList = roleQuery.list();
                    if (roleList != null) {
                        for (int j = 0; j < roleList.size(); j++) {
                            String roleid = roleList.get(j).get("ROLEID");
                            String text = roleList.get(j).get("TEXT");
                            identity.addRole(roleid);
                            currUser.getRole().add(new Role(roleid, text));
                        }
                    }
                }
  
                Ts_department depart = new Ts_department();
                depart.setId((String) userData.get("DEPARTID"));
                depart.setText((String) userData.get("DEPARTNAME"));
                currUser.getDepart().add(depart);
                System.out.println(111);
                currUser.getInfo().put("aaa", "ddd");
            }
            return currUser;
        }
        return null;
    }
}

<div class="errors">
    <h:messages id="messages" showDetail="true" globalOnly="true" />
</div>