java - 多対多の余分な列 - MySQLIntegrityConstraintViolationException: 列 'BAND_ID' を null にすることはできません

Question

余分な列を持つ多対多の関係を持つエンティティを保存しようとしていますが、エラーが発生しました

Band.java

package it.entities;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.Table;


/**
 * The persistent class for the band database table.
 * 
 */
@Entity
@Table(name="BAND")
@NamedQuery(name="Band.findAll", query="SELECT b FROM Band b")
public class Band implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", unique = true, nullable = false)
    private int id;

    @Column(name="DESCRIZIONE")
    private String descrizione;

    @Column(name="NOME")
    private String nome;

    //bi-directional many-to-one association to Audio
    @ManyToOne
    @JoinColumn(name="AUDIO_ID")
    private Audio audio;

    //bi-directional many-to-one association to Video
    @ManyToOne
    @JoinColumn(name="VIDEO_ID")
    private Video video;

    //bi-directional many-to-one association to Citta
    @ManyToOne
    @JoinColumn(name="CITTA_ID")
    private Citta citta;

    @OneToMany(mappedBy="pk.band", fetch = FetchType.LAZY, cascade={CascadeType.ALL})
    private List<BandHasMusicista> bandHasMusicista = new ArrayList<BandHasMusicista>();

    public Band() {
    }

    public int getId() {
        return this.id;
    }

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

    public String getDescrizione() {
        return this.descrizione;
    }

    public void setDescrizione(String descrizione) {
        this.descrizione = descrizione;
    }

    public String getNome() {
        return this.nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public Audio getAudio() {
        return this.audio;
    }

    public void setAudio(Audio audio) {
        this.audio = audio;
    }

    public Video getVideo() {
        return this.video;
    }

    public void setVideo(Video video) {
        this.video = video;
    }

    public Citta getCitta() {
        return this.citta;
    }

    public void setCitta(Citta citta) {
        this.citta = citta;
    }

//  @OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.band")
    public List<BandHasMusicista> getBandHasMusicista() {
        return bandHasMusicista;
    }

    public void setBandHasMusicista(List<BandHasMusicista> bandHasMusicista) {
        this.bandHasMusicista = bandHasMusicista;
    }

}

BandHasMusicista.java

package it.entities;

import java.io.Serializable;

import javax.persistence.AssociationOverride;
import javax.persistence.AssociationOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.JoinColumn;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Transient;


/**
 * The persistent class for the band_has_musicista database table.
 * 
 */
@Entity
@Table(name="BAND_HAS_MUSICISTA")
@AssociationOverrides({
    @AssociationOverride(name = "pk.musicista", joinColumns = @JoinColumn(name = "MUSICISTA_ID")),
    @AssociationOverride(name = "pk.band", joinColumns = @JoinColumn(name = "BAND_ID"))})
@NamedQuery(name="BandHasMusicista.findAll", query="SELECT b FROM BandHasMusicista b")
public class BandHasMusicista implements Serializable {
    private static final long serialVersionUID = 1L;

    private BandHasMusicistaPK pk = new BandHasMusicistaPK();

    private Band band;

    private Musicista musicista;

    private boolean bandAccept;

    private boolean musicistaAccept;

    public BandHasMusicista() {
    }

    @EmbeddedId
    public BandHasMusicistaPK getPk() {
        return pk;
    }

    public void setPk(BandHasMusicistaPK pk) {
        this.pk = pk;
    }

    @Column(name="BAND_ACCEPT", nullable=false)
    public boolean getBandAccept() {
        return this.bandAccept;
    }

    public void setBandAccept(boolean bandAccept) {
        this.bandAccept = bandAccept;
    }

    @Column(name="MUSICISTA_ACCEPT", nullable=false)
    public boolean getMusicistaAccept() {
        return this.musicistaAccept;
    }

    public void setMusicistaAccept(boolean musicistaAccept) {
        this.musicistaAccept = musicistaAccept;
    }

    @Transient
//  @JoinColumn(name="BAND_ID")
    public Band getBand() {
        return this.band;
    }

    public void setBand(Band band) {
        this.band = band;
    }

    @Transient
//  @JoinColumn(name="MUSICISTA_ID")
    public Musicista getMusicista() {
        return this.musicista;
    }

    public void setMusicista(Musicista musicista) {
        this.musicista = musicista;
    }

}

BandHasMusicistaPK.java

package it.entities;

import java.io.Serializable;

import javax.persistence.*;

/**
 * The primary key class for the band_has_musicista database table.
 * 
 */
@Embeddable
public class BandHasMusicistaPK implements Serializable {
    //default serial version id, required for serializable classes.
    private static final long serialVersionUID = 1L;

    private Band band;

    private Musicista musicista;

    public BandHasMusicistaPK() {
    }

    @ManyToOne
//  @JoinColumn(name="BAND_ID")
    public Band getBand() {
        return this.band;
    }

    public void setBand(Band band) {
        this.band = band;
    }

    @ManyToOne
//  @JoinColumn(name="MUSICISTA_ID")
    public Musicista getMusicista() {
        return this.musicista;
    }

    public void setMusicista(Musicista musicista) {
        this.musicista = musicista;
    }

}

Musicista.java

package it.entities;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.hibernate.annotations.GenericGenerator;
import org.hibernate.annotations.Parameter;


/**
 * The persistent class for the MUSICISTA database table.
 * 
 */
@Entity
@Table(name="MUSICISTA")
@NamedQuery(name="Musicista.findAll", query="SELECT m FROM Musicista m")
public class Musicista implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(generator="SharedPrimaryKeyGenerator")
    @GenericGenerator(name="SharedPrimaryKeyGenerator", strategy="foreign", parameters =  @Parameter(name="property", value="account"))
    @Column(name = "ID", unique = true, nullable = false)
    private int id;

    @Column(name="COGNOME", nullable=false, length=155)
    private String cognome;

    @Temporal(TemporalType.DATE)
    @Column(name="DATA_NASCITA")
    private Date dataNascita;

    @Column(name="NOME", nullable=false, length=155)
    private String nome;

    //bi-directional one-to-one association to Account
    @OneToOne
    @PrimaryKeyJoinColumn
    private Account account;

    @OneToMany(mappedBy="pk.musicista", fetch = FetchType.LAZY, cascade={CascadeType.ALL})
    private List<BandHasMusicista> bandHasMusicista = new ArrayList<BandHasMusicista>();

    public Musicista() {
    }

    public int getId() {
        return this.id;
    }

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

    public String getCognome() {
        return this.cognome;
    }

    public void setCognome(String cognome) {
        this.cognome = cognome;
    }

    public Date getDataNascita() {
        return this.dataNascita;
    }

    public void setDataNascita(Date dataNascita) {
        this.dataNascita = dataNascita;
    }

    public String getNome() {
        return this.nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public Account getAccount() {
        return this.account;
    }

    public void setAccount(Account account) {
        this.account = account;
    }

//  @OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.musicista")
    public List<BandHasMusicista> getBandHasMusicista() {
        return bandHasMusicista;
    }

    public void setBandHasMusicista(List<BandHasMusicista> bandHasMusicista) {
        this.bandHasMusicista = bandHasMusicista;
    }

}

BandLogic.java

package it.logic;

import it.entities.Band;
import it.entities.BandHasMusicista;
import it.entities.Citta;
import it.entities.Musicista;
import it.interfaces.ServiceBean;
import it.invo.AddBandInVO;

import javax.persistence.EntityManager;

public class BandLogic {

    EntityManager em = null; 

    /**
     * Default constructor.
     */
    public BandLogic() {
        em = ServiceBean.getEm();
    }

    public boolean addBand(AddBandInVO inVO) {
        System.out.println("IN - addBand() INPUT = " + inVO);

        Musicista musicista = em.find(Musicista.class, inVO.getAccountId());

        Citta citta = em.find(Citta.class, inVO.getCitta());

        if(musicista != null){

            Band band = new Band();
            band.setNome(inVO.getNome());
            band.setDescrizione(inVO.getDescrizione());
            band.setCitta(citta);

            BandHasMusicista bandHasMusicista = new BandHasMusicista();
            bandHasMusicista.setBand(band);
            bandHasMusicista.setMusicista(musicista);
            bandHasMusicista.setBandAccept(true);
            bandHasMusicista.setMusicistaAccept(true);

            band.getBandHasMusicista().add(bandHasMusicista);

            em.persist(band);
            em.flush();
            em.clear();
        }else{
            System.out.println("Account is not Musicista");
            return false;
        }

        System.out.println("OUT - addBand()");
        return true;
    }

}

スタック トレース:

javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
    at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
    at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:307)
    at it.logic.BandLogic.addBand(BandLogic.java:46)
    at it.interfaces.ServiceBean.addBand(ServiceBean.java:184)
    at it.test.BandTest.testAddBand(BandTest.java:25)
    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 junit.framework.TestCase.runTest(TestCase.java:176)
    at junit.framework.TestCase.runBare(TestCase.java:141)
    at junit.framework.TestResult$1.protect(TestResult.java:122)
    at junit.framework.TestResult.runProtected(TestResult.java:142)
    at junit.framework.TestResult.run(TestResult.java:125)
    at junit.framework.TestCase.run(TestCase.java:129)
    at junit.framework.TestSuite.runTest(TestSuite.java:255)
    at junit.framework.TestSuite.run(TestSuite.java:250)
    at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:84)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:94)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
    at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:304)
    ... 22 more
Caused by: java.sql.BatchUpdateException: Column 'BAND_ID' cannot be null
    at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2054)
    at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1467)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    ... 28 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'BAND_ID' cannot be null
    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:1041)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4187)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4119)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2570)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2731)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2815)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
    at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2006)
    ... 31 more

Answer 1

このコードでは:

if(musicista != null){

            Band band = new Band();
            band.setNome(inVO.getNome());
            band.setDescrizione(inVO.getDescrizione());
            band.setCitta(citta);

            BandHasMusicista bandHasMusicista = new BandHasMusicista();
            bandHasMusicista.setBand(band);
            bandHasMusicista.setMusicista(musicista);
            bandHasMusicista.setBandAccept(true);
            bandHasMusicista.setMusicistaAccept(true);

            band.getBandHasMusicista().add(bandHasMusicista);

            em.persist(band);
            em.flush();
            em.clear();
        }

新しいを作成してから、バンドBandに追加しようとしています。Musicista問題は、生成された SQL が を保存する前にem.persist(band)を保存しようとしているため、自動的に生成された SQL が のままであることです。名前を付けて保存MusicistaBandBAND_IDnullBand

if(musicista != null){

            Band band = new Band();
            band.setNome(inVO.getNome());
            band.setDescrizione(inVO.getDescrizione());
            band.setCitta(citta);

            band = em.persist(band);

            BandHasMusicista bandHasMusicista = new BandHasMusicista();
            bandHasMusicista.setBand(band);
            bandHasMusicista.setMusicista(musicista);
            bandHasMusicista.setBandAccept(true);
            bandHasMusicista.setMusicistaAccept(true);

            band.getBandHasMusicista().add(bandHasMusicista);

            em.persist(band);
            em.flush();
            em.clear();
        }

うまくいくはずです（最初の保存でも簡単にできると思いますがem.persist(band);、よくわかりません）。