help me ! 2 day~ about update detail fk!!!

[ghyghost]

package orm;

import java.util.HashSet;
import java.util.Set;

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.OneToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

/**
 * Sheng entity.
 * 
 * @author MyEclipse Persistence Tools
 */
@Entity
@Table(name = "SHENG", schema = "y246")
public class Sheng implements java.io.Serializable {

        // Fields

        private Long id;
        private String shengname;
        private Set<Shi> shis = new HashSet<Shi>(0);

        // Constructors

        /** default constructor */
        public Sheng() {
        }

        /** minimal constructor */
        public Sheng(Long id) {
                this.id = id;
        }

        /** full constructor */
        public Sheng(Long id, String shengname, Set<Shi> shis) {
                this.id = id;
                this.shengname = shengname;
                this.shis = shis;
        }

        // Property accessors
        @Id
        @Column(name = "ID", unique = true, nullable = false, precision = 9, 
scale
= 0)
        @SequenceGenerator(allocationSize = 1, name = "idauto", sequenceName =
"idauto")
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = 
"idauto")
        public Long getId() {
                return this.id;
        }

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

        @Column(name = "SHENGNAME", length = 50)
        public String getShengname() {
                return this.shengname;
        }

        public void setShengname(String shengname) {
                this.shengname = shengname;
        }

        @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy =
"sheng")
        public Set<Shi> getShis() {
                return this.shis;
        }

        public void setShis(Set<Shi> shis) {
                this.shis = shis;
        }

}




-------------------------------------------------------
package orm;

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.SequenceGenerator;
import javax.persistence.Table;

/**
 * Shi entity.
 * 
 * @author MyEclipse Persistence Tools
 */
@Entity
@Table(name = "SHI", schema = "Y246")
public class Shi implements java.io.Serializable {

        // Fields

        private Long id;
        private Sheng sheng;
        private String shiname;

        // Constructors

        /** default constructor */
        public Shi() {
        }

        /** minimal constructor */
        public Shi(Long id) {
                this.id = id;
        }

        /** full constructor */
        public Shi(Long id, Sheng sheng, String shiname) {
                this.id = id;
                this.sheng = sheng;
                this.shiname = shiname;
        }

        // Property accessors
        @Id
        @Column(name = "ID", unique = true, nullable = false, precision = 9, 
scale
= 0)
        @SequenceGenerator(allocationSize = 1, name = "idauto", sequenceName =
"idauto")
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = 
"idauto")
        public Long getId() {
                return this.id;
        }

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

        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "SHENGID")
        public Sheng getSheng() {
                return this.sheng;
        }

        public void setSheng(Sheng sheng) {
                this.sheng = sheng;
        }

        @Column(name = "SHINAME", length = 50)
        public String getShiname() {
                return this.shiname;
        }

        public void setShiname(String shiname) {
                this.shiname = shiname;
        }

}

---------------------------------------------------
package controller;

import java.io.IOException;

import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import orm.Sheng;
import orm.ShengFacadeLocal;
import orm.Shi;
import orm.ShiFacadeLocal;

public class updateShi extends HttpServlet {

        @EJB
        ShiFacadeLocal shiFacadeLocalRef;
        @EJB
        ShengFacadeLocal shengFacadeLocalRef;

        public void doGet(HttpServletRequest request, HttpServletResponse 
response)
                        throws ServletException, IOException {
                Sheng heilongjiangSheng = shengFacadeLocalRef.findById(2030L);

                System.out.println(heilongjiangSheng.getShengname());

                Shi shi = shiFacadeLocalRef.findById(2029L);

                System.out.println(shi.getShiname());

                shi.setSheng(heilongjiangSheng);

                System.out.println(heilongjiangSheng.getShis());

                shengFacadeLocalRef.update(heilongjiangSheng);

        }

}



-------------------------------------
use oracle db and weblogic10.3.3

shi detail table "shengid" field not update, is old value!!!!!!!

why ??help me please!! thank you!
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