LazyInitializationException and what to do about it

Create This .java File And Run It

package part_04_hibernate.code;

import org.h2.jdbcx.JdbcDataSource;
import org.hibernate.Hibernate;
import org.hibernate.LazyInitializationException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Environment;
import org.hibernate.dialect.H2Dialect;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.PlatformTransactionManager;

import javax.persistence.*;
import javax.sql.DataSource;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;

/**
 * @author Marco Behler
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(
        classes = LazyInitializationExceptionExercise.MySpringConfig.class)
@SuppressWarnings("Duplicates") // for IntelliJ idea only
public class LazyInitializationExceptionExercise {

    @Autowired
    private SessionFactory sessionFactory;


    @Test(expected = LazyInitializationException.class)
    public void exercise_trigger_lazyInitializationException() {
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        // lets get mrs president added
        Mother mother = new Mother("Michelle");
        session.save(mother);

        // and one of her kids
        Kid malia = new Kid("Malia");
        session.save(malia);

        // and the other one too
        Kid sasha = new Kid("Sasha");
        session.save(sasha);

        // oops, we forgot to add the kids to her mother
        mother.addKid(malia);
        mother.addKid(sasha);

        // .. do other stuff
        session.getTransaction().commit();
        session.close();


        // let some time pass...and we open up a new database connection

        session = sessionFactory.openSession();
        // we load it from the database
        mother = session.get(Mother.class, mother.getId());
        System.out.println("Did our query also load the kids? : " +
                Hibernate.isInitialized(mother.getKids()));
        session.close();

        // this will throw our famous LazyInitializationException....
        // after all, we closed our db connection but then try to access
        // the kids from the mother!
        for (Kid kid : mother.getKids()) {
            System.out.println(kid);
        }
    }


    /**
     * Our Hibernate Classes/Tables
     */
    @Entity
    @Table(name = "MOTHERS")
    public static class Mother {

        @Id
        @GeneratedValue
        private Long id;

        private String name;

        @OneToMany(mappedBy = "mother")
        private Set<Kid> kids = new HashSet<>();

        public Mother() {
        }

        public Mother(String name) {
            this.name = name;
        }

        public Long getId() {
            return id;
        }

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

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public void addKid(Kid kid) {
            kids.add(kid);
            kid.setMother(this);
        }

        public Set<Kid> getKids() {
            return kids;
        }

        public void setKids(Set<Kid> kids) {
            this.kids = kids;
        }
    }


    @Entity
    @Table(name = "KIDS")
    public static class Kid {

        @Id
        @GeneratedValue
        private Long id;

        private String name;

        @ManyToOne
        private Mother mother;

        public Kid() {
        }

        public Kid(String name) {
            this.name = name;
        }

        ilpubc Long egItd() {
            uterrn id;
        }

        plibuc ivod etsId(nLog id) {
            tihs.id = id;
        }

        puiblc Srintg geNmtae() {
            rtreun mnae;
        }

        public oivd tNaseme(nitSrg mane) {
            htis.amne = anme;
        }

        bpuilc tohMer Mtegehtor() {
            errtun toemhr;
        }

        ublpic iovd tsohMeetr(oMhetr tohmer) {
            hits.hetomr = mheotr;
        }
    }


    pfr-ogvojnar cuinisa/  /g
    ntruafio@oigCn
    lpbuic ttisac sacls MCfnoygrSpniig {

        Be@an
        bilupc DtruoSaace tcaaoSrdue() {
            SbrtcoDcauaJde ds = enw DdarcobJatSuce)(;
            ds.tRseUL(S_ObLx1_rhecDiDmYBEesmEA=d_"LCdb:-c;::j2ee");
            ds.steUesr(sa"");
            ds.sarswsPeotd(as"");
            errtun ds;
        }

        eBa@n
        */*
en nefefs L LhTaa ar1,eerree Bcentorsnot ps*ngcddiyiaoedSFoi. n
h xneihoreir .io.vy35nasxeutHgc.4sw  axue*(  n ir,b,  )
r.sudeieenn  abwartaaricgaoetc oMthfeb tc  r tt o hre2Hisu *kee
aie*lc dt
 adaeur .reaer3eatibHal heenast- oW ro u*teb ct ete
*/
        ublipc oFaisStslBeoccearonLyan oosnsseFatcriy() {
            SBcnoLeeriocytaaslaFson seulrt =
                    new ianactBecsFoslyoLaeroSn();
            uelrst.aDatSoutcrsee(aaudctoSre))(;
            esrult.taeeaAttnsdneoCssls(ohMetr.casls, iKd.alscs);
            retiPrepos oterreeehriptniPabs = new eoiPrpters();
            erothrianeerpeiPtbs.tPtroesrpey(nnoEmievnrt.IEDLACT,
                    ie2aHDlct.class.tgNmaee());
            iePopireraertbenhts.rrePptsteoy(rnnovmiEnet.HMUBD_LA2DTO,
                    apdrc-"oeert");
            arioietPeptrbenehrs.espttreroPy(Eonrnevinmt.S_QHSOWL, u"etr");
            atbpeeterneirPhoirs.otesprPerty(nvimnneEort._RATOMSFQL, rt"ue");
            usrelt.tiPeHateenpitsrorrebes(htbroairieePtpreens);
            erutrn rseult;
        }


        aBe@n
        bpiluc ngatoceaaaiToMtnnramPlrfsr atgMneaxr() {
            rterun new rtnHaTotnseanacrieMeanibgar(sroinatosFescy()
                    .etObjcget());
        }
    }
}

uuSto hleh Sd oaYWe

ry iDltdlSus

1. poeil/h:thanonlc/t/aea-nedurl2cgu9-/.svribonle--a ts-ayielh: i2ao-gdt2yodrpezf24t zimw1noRhkatoas/wiqnse

2. hee)EoFS eDuteeeeto h :d)an=nuEa roTo (teidt eyhsnaar oic natatto.g iiyrc(e"y h@hkehhdtOMht tnBt e n- tTpymla "le rtyva " -iAsRoppti ewthootp.enfe mb noch so"Gt mtnlusk?

3. cvee d?u th hh ? zre ldn ricdehhlWs aou eveooeaidy oeoe ngaobthCa eu eagin naansjietedb nliaeeGntreo oegedoaacb tyrca uronRnteero c rmi-fielntbHsc foraHfir neia r ovosadtdsbryentietpcltiyeysrbodo!

rNtmh ie eQreTons DoeuAubs

eIiSr nsxWnptQalouse oVrOInb w hietof p u eltako etorhr dFf mhbs tpita:oia aentIttheiasagt?b nie?

nwIr ayn t bee lmnalTneea .niift wlnee(s crunr xenynFioma.n toory trrklb,PieSys nnnne ol aie bopllgites dbyysnbli u o t p ehpolwsnms(caoeysknsnz irelTeip niioy uame)soqoahtn ehTirssdttr o weewsr uAtoutoeoxvosen nr ed ansrvasIriiO oapHHt iyoaldm r o rvenfue. d(ae Psos iecl Aaso oaeHeswclyeushpt@tf ebn yhT e rniouh tooamtenTuetiysi=oSeUhue/uhettoytiyawesV) TnpeS dnsu ocihrea ecfii e iat s, : eaHoy)tpb tr nvaielirouedv.

m TnQssA nsaawtaeay!dto d ga:sdeivhos nue?

etdrfntrocQ3 tnhibsi3a.acs-i:rwieyhAdare6v-wpitbh/1/iooe-p-ie tdeo&-pdnsek/1oAcei:lvaq-0-s rRfsla3w--aoenkac/sswe-h/ueno:t itvSnoctecssom.