Question

你好我有这个错误信息，我真的不知道该怎么做。

“通过未标记为级联PERSIST的关系找到了一个新对象”

我知道实体关系有问题，但我尝试了很多东西而且没有用。

这是我的两个豆子：

@Entity
public class Emoji implements Serializable  {

    private static long serialVersionUID = 1L;

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public static void setSerialVersionUID(long aSerialVersionUID) {
        serialVersionUID = aSerialVersionUID;
    }
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @ManyToOne
    private Utilisateur createur;
    private String titre;
    private List<Message> conversations;...

...

@Entity
public class Message implements Serializable  {

    private static long serialVersionUID = 1L;

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }


    public static void setSerialVersionUID(long aSerialVersionUID) {
        serialVersionUID = aSerialVersionUID;
    }
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String message;
    @ManyToOne
    private Utilisateur auteur;

    public Message() {
    } ...

Answer 1

将import org.junit.Before; import org.junit.Test; import java.lang.reflect.Field; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import static org.junit.Assert.fail; import static org.hamcrest.MatcherAssert.assertThat; import static org.hamcrest.core.IsNull.notNullValue; public class SingletonTest { @Before public void resetSingleton() throws NoSuchFieldException, IllegalAccessException { Field instance = Singleton.class.getDeclaredField("singleton"); instance.setAccessible(true); instance.set(null, null); } @Test public void singletonCanFindFile() throws Exception { final Path path = Paths.get("maybeIExist.txt"); Files.createFile(path); final Singleton instance = Singleton.getInstance(); assertThat(instance, notNullValue()); Files.deleteIfExists(path); } @Test(expected = ExceptionInInitializerError.class) public void singletonCannotFindFile() throws Exception { final Singleton instance = Singleton.getInstance(); fail("no exception thrown!"); } }注释添加到@OneToMany字段。

conversations

JPA - 未标记级联的ArrayList关系PERSIST

1 个答案: