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したがって、Users アカウントと LastFm アカウントの 2 つのオブジェクトがあります。現在、ユーザーは LastFm アカウントを持っていない可能性がありますが、すべての LastFm アカウントは正確に 1 人のユーザーにマップされます。問題の領域について少し理解できたところで、ここに問題があります。LastFm アカウントを保存するたびに例外が発生します。例外は次のとおりです。

Hibernate: insert into LAST_FM_ACCOUNT (LAST_FM_PASSWORD, LAST_FM_USERNAME, USER_ID) values (?, ?, ?)
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`mobsterdb`.`LAST_FM_ACCOUNT`, CONSTRAINT `USER_ID_FK` FOREIGN KEY (`USER_ID`) REFERENCES `MOBSTER_USER` (`USER_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION)
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:74)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:129)
    at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
    at $Proxy17.executeUpdate(Unknown Source)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2767)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3278)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:203)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:183)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:167)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:320)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:126)
    at org.hibernate.ejb.event.EJB3SaveEventListener.saveWithGeneratedId(EJB3SaveEventListener.java:71)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:204)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:189)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:757)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:749)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:745)
    at mobster.persistence.dao.generic.MobsterBaseHibernateDAO.create(MobsterBaseHibernateDAO.java:22)
    at cc.main(cc.java:35)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`mobsterdb`.`LAST_FM_ACCOUNT`, CONSTRAINT `USER_ID_FK` FOREIGN KEY (`USER_ID`) REFERENCES `MOBSTER_USER` (`USER_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1040)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2450)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2371)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2355)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
    ... 26 more

2 つのエンティティ クラスを次に示します。

@Entity
@Table(name = "LAST_FM_ACCOUNT")
public final class LastFmAccount implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(generator = "system-id")
@GenericGenerator(name = "system-id", strategy = "identity")
@Column(name = "LAST_FM_ACCOUNT_ID", unique = true)
private int id;

@NotNull
@Column(name = "LAST_FM_USERNAME")
@Type(type = "encryptedString")
private String lastFmUserName;

@NotNull
@Column(name = "LAST_FM_PASSWORD")
@Type(type = "encryptedString")
private String lastFmPassword;

@OneToOne
@JoinColumn(name = "USER_ID")
private MobsterUser user;

public LastFmAccount() {
    /* null op */
}

public LastFmAccount(String lastFmUserName, String lastFmPassword,
        MobsterUser user) {
    super();
    this.lastFmUserName = lastFmUserName;
    this.lastFmPassword = lastFmPassword;
    this.user = user;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getLastFmUserName() {
    return lastFmUserName;
}

public void setLastFmUserName(String lastFmUserName) {
    this.lastFmUserName = lastFmUserName;
}

public String getLastFmPassword() {
    return lastFmPassword;
}

public void setLastFmPassword(String lastFmPassword) {
    this.lastFmPassword = lastFmPassword;
}

public MobsterUser getUser() {
    return user;
}

public void setUser(MobsterUser user) {
    this.user = user;
}

@Override
public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + id;
    result = prime * result
            + ((lastFmPassword == null) ? 0 : lastFmPassword.hashCode());
    result = prime * result
            + ((lastFmUserName == null) ? 0 : lastFmUserName.hashCode());
    result = prime * result + ((user == null) ? 0 : user.hashCode());
    return result;
}

@Override
public boolean equals(Object obj) {
    if (this == obj)
        return true;
    if (obj == null)
        return false;
    if (getClass() != obj.getClass())
        return false;
    LastFmAccount other = (LastFmAccount) obj;
    if (id != other.id)
        return false;
    if (lastFmPassword == null) {
        if (other.lastFmPassword != null)
            return false;
    } else if (!lastFmPassword.equals(other.lastFmPassword))
        return false;
    if (lastFmUserName == null) {
        if (other.lastFmUserName != null)
            return false;
    } else if (!lastFmUserName.equals(other.lastFmUserName))
        return false;
    if (user == null) {
        if (other.user != null)
            return false;
    } else if (!user.equals(other.user))
        return false;
    return true;
}

@Override
public String toString() {
    return "LastFmAccount [id=" + id + ", lastFmUserName=" + lastFmUserName
            + ", lastFmPassword=" + lastFmPassword + ", user=" + user + "]";
} 
}
//New Table
@Entity @Table(name = "MOBSTER_USER")
public final class MobsterUser implements Serializable {
private static final long serialVersionUID = 1L;
private String userId, email, password, firstName, lastName;
private char gender;
private Date birthday;

public MobsterUser() {

}

public MobsterUser(String email, String password,
        String firstName, String lastName, char gender, Date birthday) {
    this.email = email;
    this.password = password;
    this.firstName = firstName;
    this.lastName = lastName;
    this.gender = gender;
    this.birthday = birthday;
}

@Id
@GeneratedValue(generator="system-uuid")
@GenericGenerator(name="system-uuid", strategy = "uuid")
@Column(name = "USER_ID", unique = true)
public String getUserId() {
    return userId;
}

public void setUserId(String userId) {
    this.userId = userId;
}

@Column(name = "EMAIL", unique = true)
@NotNull
public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

@Column(name = "PASSWORD")
@NotNull
@Type(type="encryptedString")
public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

@Column(name = "FIRST_NAME")    
@NotNull
public String getFirstName() {
    return firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

@Column(name = "LAST_NAME")
@NotNull
public String getLastName() {
    return lastName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

@Column(name = "GENDER")
@NotNull
public char getGender() {
    return gender;
}

public void setGender(char gender) {
    this.gender = gender;
}

@Column(name = "BIRTHDATE")
@Temporal(TemporalType.DATE)
public Date getBirthday() {
    return birthday;
}

public void setBirthday(Date birthday) {
    this.birthday = birthday;
}

@Override
public String toString() {
    return "MobsterUser [userId=" + userId + ", email=" + email
            + ", password=" + password + ", firstName=" + firstName
            + ", lastName=" + lastName + ", gender=" + gender
            + ", birthday=" + birthday + "]";
}

}

基本的に同じ問題に関する投稿がいくつかあることはわかっていますが、ここで私が間違っていることを誰かが見ていますか?

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