WFLYJPA0060：执行此操作需要事务（使用事务或扩展持久性上下文）

Question

我浪费了很多时间尝试解决这个问题，但我在同一个地方。我怀疑我将 CDI 与 EJB 混合在一起。

问题是持续存在，仅删除不起作用。

Caused by: javax.persistence.TransactionRequiredException: WFLYJPA0060: Transaction is required to perform this operation (either use a transaction or extended persistence context)
    at org.jboss.as.jpa.container.AbstractEntityManager.transactionIsRequired(AbstractEntityManager.java:866)
    at org.jboss.as.jpa.container.AbstractEntityManager.persist(AbstractEntityManager.java:579)
    at com.oki.scope.console.model.dao.GenericDAO.save(GenericDAO.java:29)
    at com.oki.scope.console.model.dao.GenericConsoleDAO.save(GenericConsoleDAO.java:12)
    at com.oki.scope.console.service.ServidorServiceImp.salvar(ServidorServiceImp.java:27)
    at com.oki.scope.console.service.ServidorServiceImp$Proxy$_$$_WeldClientProxy.salvar(Unknown Source)
    at com.oki.scope.console.managedBean.consulta.ServidorMB.salvar(ServidorMB.java:65)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:292)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    ... 40 more

我的 DAO

public class GenericDAO<T, K> {

    protected EntityManager em;
    private Class<T> entityClass;

    public GenericDAO(Class<T> entityClass,  EntityManager em) {
        this.entityClass = entityClass;
        this.em = em;
    }

    @Transactional
    protected void save(T entity) {
        em.persist(entity);
    }

通用 DAO：

import javax.persistence.EntityManager;

public abstract class GenericConsoleDAO<T, K> extends GenericDAO<T, K> {

     public GenericConsoleDAO(Class<T> entityClass, EntityManager em) {
        super(entityClass, em);
    }

    public void save(T t){
        super.save(t);
    }

}

DAO 工厂：

package com.oki.scope.console.model.dao;

import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.ejb.Singleton;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@Singleton
@TransactionManagement(TransactionManagementType.CONTAINER)
public class DAOConsoleFactory {
    private final static String UNIT_NAME = "scope-console";

    private static Map<String, Object> mapa = Collections.synchronizedMap(new HashMap<String, Object>());

    @PersistenceContext(unitName = UNIT_NAME )  
    private EntityManager entityManager;

    @Produces public ServidorDAO            criaServidorDAO(){          return getDAO(ServidorDAO.class); }
    @Produces public ConexaobdDAO           criaConexaoDAO(){           return getDAO(ConexaobdDAO.class);      }
    @Produces public ContratoDAO            criaContratoDAO(){          return getDAO(ContratoDAO.class);   }
    @Produces public EmpresaDAO             criaEmpresaDAO(){           return getDAO(EmpresaDAO.class); }
    @Produces public LojaDAO                criaLojaDAO(){              return getDAO(LojaDAO.class);   }
    //@Produces public RedeAutorizadoraDAO  criaRedeAutorizadoraDAO(){  return getDAO(RedeAutorizadoraDAO.class); }
    @Produces public RedeDAO                criaRedeDAO(){              return getDAO(RedeDAO.class);   }
    @Produces public RoteadorDAO            criaRoteadorDAO(){          return getDAO(RoteadorDAO.class);   }
    @Produces public TerminalDAO            criaTerminalDAO(){          return getDAO(TerminalDAO.class);   }
    @Produces public TipoHeaderDAO          criaTipoHeaderDAO(){        return getDAO(TipoHeaderDAO.class);     }

    @SuppressWarnings("unchecked")
    public <E> E getDAO(Class<E> classe){
        String key = classe.getSimpleName();
        if (!mapa.containsKey(key))
        {
            try {
                mapa.put(key, classe.getDeclaredConstructor(EntityManager.class).newInstance(entityManager));
            } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
                    | InvocationTargetException | NoSuchMethodException | SecurityException e) {
                System.out.println("Classe "+ key +" não possui um construtor que tenha EntityManager como parametro.");
            }
        }
        return (E)mapa.get(key);

    }
}

我的班级：

@Named
@ApplicationScoped
public class ServidorServiceImp implements ServidorService {

    @Inject private ServidorDAO dao;


    @Override
    public List<Servidor> getLista() {
        return dao.getLista();
    }

    @Override
    public void salvar(Servidor servidor) {
        if (servidor.getId()==0){
            dao.save(servidor);
        }
        else
        {
            dao.update(servidor);
        }
    }

    @Override
    public void remover(Servidor servidor) {
        dao.delete(servidor);

    }

}

Answer 1

在尝试提高性能时，您已经避开了容器应该为您做的事情，即在事务中实例化一个 bean。

我想说从DAOConsoleFactory 中删除@Singleton 和@TransactionManagement(TransactionManagementType.CONTAINER)，并允许使用DAO 的EJB bean 处理EJB 事务。

更新：另外，@ApplicationScoped 不是 EJB 注释类 ServidorServiceImp 需要是 EJB bean，因此，它应该使用 @Stateless 或 @Statefull 进行注释并删除 @ApplicationScoped。它读起来就像一个无状态的 EJB bean，因此不需要将其设为应用程序范围。

在我看来，您似乎过于专注于尝试优化性能而没有很好地理解 EJB 应该如何在容器中工作。我建议让一切正常工作并遵循架构最佳实践，尤其是在“会话外观”概念中。其中一些帖子可能会有所帮助：What is the point of a Facade in Java EE? 或 Why use Facade pattern for EJB session bean。

Answer 2

已解决：前 2 天受苦。问题出在我的课堂上。 @Named 在哪里 @ApplicationScoped，我改成了@Statefull。