Question

我有以下方法不会保留记录。如果我从servlet运行另一个查询并在其余服务更新后查看此记录，我看不到更改。有什么想法没有被坚持下去吗？我还试过flush()和/或clear()但没有运气：

@POST
@Path("translations")
@Produces({MediaType.APPLICATION_JSON})
@Consumes({MediaType.APPLICATION_JSON})
public Translation updateTranslationValue(Translation translation,     
@Context HttpServletRequest request) {
    request.getSession().setAttribute("reload_xlate", true);
    EntityManager em = entityManagerFactory.createEntityManager();
    em.getTransaction().begin();

    TypedQuery<Translation> query = em.createQuery(
            "SELECT t FROM Translation t WHERE t.key = :key", Translation.class);
    query.setParameter("key", translation.getKey());
    Translation mappedTranslation = query.getSingleResult();
    mappedTranslation.setValue(translation.getValue());
    L.info("Updated: {}", mappedTranslation);
    //em.flush();
    //em.clear();
    em.getTransaction().commit();
    em.close();
    return mappedTranslation;
}

这是我的persistence.xml：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
 http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="MyJPAJAXRS" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <non-jta-data-source>jdbc/myds</non-jta-data-source>
    <properties>
      <property name="javax.persistence.schema-generation.database.action"
                value="drop-and-create"/>
      <property name="javax.persistence.sql-load-script-source" value="META-INF/seed.sql"/>
    </properties>
  </persistence-unit>
</persistence>

我的Jetty数据源是：

<Configure id="wac" class="org.eclipse.jetty.webapp.WebAppContext">
    <New id="DSTest" class="org.eclipse.jetty.plus.jndi.Resource">
        <Arg>jdbc/myds</Arg>
        <Arg>
            <New class="com.zaxxer.hikari.HikariDataSource">
                <Arg>
                    <New class="com.zaxxer.hikari.HikariConfig">
                        <!--<Set name="minimumPoolSize">5</Set>-->
                        <!--<Set name="maximumPoolSize">20</Set>-->
                        <Set name="dataSourceClassName">
                            org.h2.jdbcx.JdbcDataSource
                        </Set>
                        <Call name="addDataSourceProperty">
                            <Arg>url</Arg>
                            <Arg>jdbc:h2:mem:test_mem</Arg>
                        </Call>
                    </New>
                </Arg>
            </New>
        </Arg>
    </New>
</Configure>

Answer 1

结果显示H2，数据库池设置只需更改为1个连接：

<Set name="minimumPoolSize">1</Set>
<Set name="maximumPoolSize">1</Set>

这就是诀窍。

Jetty + Hibernate + JPA事务不与H2持续存在

1 个答案: