Hibernate 3中的自动完成，没有JTA，没有EJB，没有JPA

Question

正如我在PrimeFaces展示中看到的那样，我的autoComplete需要一个转换器才能工作，所以我做了以下操作:

<p:autoComplete id="ListaInst"
    emptyMessage="Nenhuma instituição encontrada."
    value="#{InstituicaoController.inst1}"
    completeMethod="#{InstituicaoController.getInstituicoesLike}"
    var="i"
    itemLabel="#{i.inst_nome}"
    itemValue="#{i}"
    converter="instituicaoConverter"
    required="true"
    style="width: 200px;font-family: monospace; font-size: 14px; margin-top: 4px;" />

托管bean方法:

public Collection<Instituicao> getInstituicoesLike(String searchKeyword) {
    InstituicaoDao dao = new InstituicaoDao();
    Collection<Instituicao> instituicoes = dao.getInstituicoesLike(searchKeyword);
    return instituicoes;
}

DAO方法:

public Collection<Instituicao> getInstituicoesLike(String searchKeyword) {
    Session ss = HibernateUtil.getSessionFactory().getCurrentSession();
    try {
        ss.beginTransaction();
        List instituicoes = ss.createCriteria(Instituicao.class).add(Restrictions.like("inst_nome", searchKeyword)).list();
        ss.beginTransaction().commit();
        ss.close();
        ss.clear();
        return instituicoes;
    } catch(HibernateException e) {
        ss.getTransaction().rollback();
        ss.close();
        ss.clear();
    }
    return null;
}

我知道最好使用JTA, JPA 2.1, JSF 2.2, EJB 3.1和Hibernate 4.3.4(并且使用这些可以完美地工作)，但我不知道它是否可以在我正在进行的项目中接受。心胸狭窄的开发人员不希望"重新学习所有东西"，并且认为像this.manager.persist(entity)这样的代码比上面的样板代码更糟糕。

注::转换代码:

package br.com.solidaria.converters;
import br.com.solidaria.dao.InstituicaoDao;
import br.com.solidaria.model.Instituicao;
import javax.faces.component.*;
import javax.faces.context.*;
import javax.faces.convert.*;
/**
 *
 * @author Rodrigo Sieja Bertin
 */
@FacesConverter(forClass = Instituicao.class, value = "instituicaoConverter")
public class InstituicaoConverter implements Converter {
    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        InstituicaoDao dao = new InstituicaoDao();
        Instituicao i = InstituicaoDao.getById(Integer.parseInt(value));
        return i;
    }
    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
    Instituicao i = (Instituicao) value;
        return String.valueOf(i.getId());
    }
}

Answer 1

感谢Xtreme Biker的评论，将ss.beginTransaction().commit()改为ss.getTransaction().commit(), TransactionException不见了

把getCurrentSession()改成openSession()，去掉SessionException。

最后将查询行改为List instituicoes = ss.createCriteria(Instituicao.class).add(Restrictions.like("inst_nome", searchKeyword, MatchMode.START).ignoreCase()).list();，问题就解决了。