小编joa*_*vio的帖子

JPA持久性@Basic(optional = false)和@Column(nullable = false)JPA持久性之间有什么区别？

我把surefire和cobertura插件放在我的pom.xml,但我无法配置他们工作正常.或者cobertura不运行或测试执行两次.

那么,我怎么能配置它们一起运行的插件呢？

如果我以这种方式配置,cobertura不会运行:

<plugin>
<groupId>org.codehaus.mojo</groupId>
    <artifactId>cobertura-maven-plugin</artifactId>
<version>2.5.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
    <version>2.12</version>
</plugin>

如果我以这种方式配置,测试将执行两次:

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>cobertura-maven-plugin</artifactId>
    <version>2.5.1</version>
    <executions>
        <execution>
            <phase>test</phase>
            <goals>
                <goal>cobertura</goal>
            </goals>
        </execution>
    </executions>
</plugin>
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.12</version>
</plugin>

考虑到有两个实体,即部门和员工,其中一个部门有N个员工.

在Departament:

@OneToMany(mappedBy = "department", fetch = FetchType.EAGER)
private Collection<Employee> employees = new ArrayList<Employee>();

在员工中:

@ManyToOne(fetch = FetchType.EAGER)
private Department department;

一切正常,但我想在没有设置反向关系的情况下将员工添加到部门.例如:

// I will add two employees to a department
department.getEmployees().add(employee1);
department.getEmployees().add(employee2);

// In fact, it is necessary to set the opposite side of the relationship
employee1.setDepartment(department);
employee2.setDepartment(department);

entityManager.merge(department);      
//...

所以,我的问题是:是否有某种方式(例如通过一些注释)JPA会理解它应该将更改传播到关系的另一端而不是我明确的那样？换句话说,我只想这样做:

department.getEmployees().add(employee1);
department.getEmployees().add(employee2);
entityManager.merge(department);

非常感谢!

我在DB中有双重插入的奇怪错误.我有以下课程:

• TestEntity - 具有@PrePersist和@PostPersist方法的实体.
• Auditoria - 审计实体
• 数据集 - DatasetBean的接口
• DatasetBean - 实现数据集的无状态bean
• DatasetFactory - 实例是数据集的EJB(查找)

我把问题放在junit测试中(我使用的是嵌入式Glassfish):

@Test
public void test() throws NamingException {
    Dataset<TestEntity> dataset = this.lookupBy(DatasetBean.class);
    Assert.assertNotNull(dataset);

    TestEntity t = new TestEntity();        
    t.setName(UUID.randomUUID().toString());

    dataset.insert(t);
    System.out.println("end");
}

测试流程如下:

1. 在获取数据集对象后,我尝试插入TestEntity对象

   @Stateless @EJB(name ="...",beanInterface = Dataset.class)公共类DatasetBean实现Dataset {

   @PersistenceContext(type = PersistenceContextType.TRANSACTION)
   private EntityManager entityManager;
   
   @Override
   public void insert(T entidade) {
       LOG.info("Inserting: " + entidade);
       entityManager.persist(entidade);
   }
   //...
   

   Run Code Online (Sandbox Code Playgroud)

   }

2. 使用DatasetFactory,我尝试在TestEntity的@PostPersist方法中插入审计实体

   公共类DatasetFactory {公共静态数据集createDataset(){尝试{回报率(数据集)新的InitialContext()查询( "...").} catch(Exception ex){throw new RuntimeException(ex); }}}

   @Entity公共类TestEntity实现MyEntity {@Id private Integer id; …

我想使用entitymanager审核插入,更新,删除等.为此,我怎么能为EntityManager.class做一个可以使用EJB的拦截器???