title: JPA @EmbeddedId is not generating sequence
body: <p>I have a table which has composite primary key consisting one sequence and two foreign keys
  I am able to persist My entity class but it is not generating according to the sequence. The table which has composite primary key consisting one sequence and two foreign keys, hbm2java in maven gives following entities</p>
  
  <p>Here is the Main Entity</p>
  
  <pre>
  <code>
  package aop.web.teacher.rmodels;
  
  // Generated Dec 14, 2010 8:45:32 PM by Hibernate Tools 3.2.2.GA
  
  import java.util.Date;
  import javax.persistence.AttributeOverride;
  import javax.persistence.AttributeOverrides;
  import javax.persistence.Column;
  import javax.persistence.EmbeddedId;
  import javax.persistence.Entity;
  import javax.persistence.FetchType;
  import javax.persistence.JoinColumn;
  import javax.persistence.ManyToOne;
  import javax.persistence.Table;
  import javax.persistence.Temporal;
  import javax.persistence.TemporalType;
  
  /**
   * Schoolmaster generated by hbm2java
   */
  @Entity
  @Table(name = "schoolmaster", schema = "public")
  public class Schoolmaster implements java.io.Serializable {
  
   private SchoolmasterId id;
          ...
  
  
   @EmbeddedId
   @AttributeOverrides({
     @AttributeOverride(name = "id", column = @Column(name = "id", nullable = false)),
     @AttributeOverride(name = "districtId", column = @Column(name = "district_id", nullable = false)),
     @AttributeOverride(name = "typeOfSchool", column = @Column(name = "type_of_school", nullable = false)) })
   public SchoolmasterId getId() {
    return this.id;
   }
  
   public void setId(SchoolmasterId id) {
    this.id = id;
   }
  
   @ManyToOne(fetch = FetchType.LAZY)
   @JoinColumn(name = "type_of_school", nullable = false, insertable = false, updatable = false)
   public AopTeachersTypeMaster getAopTeachersTypeMaster() {
    return this.aopTeachersTypeMaster;
   }
  
   public void setAopTeachersTypeMaster(
     AopTeachersTypeMaster aopTeachersTypeMaster) {
    this.aopTeachersTypeMaster = aopTeachersTypeMaster;
   }
  
   @ManyToOne(fetch = FetchType.LAZY)
   @JoinColumn(name = "school_nature")
   public AopTeachersSchoolNatureMaster getAopTeachersSchoolNatureMaster() {
    return this.aopTeachersSchoolNatureMaster;
   }
  
   public void setAopTeachersSchoolNatureMaster(
     AopTeachersSchoolNatureMaster aopTeachersSchoolNatureMaster) {
    this.aopTeachersSchoolNatureMaster = aopTeachersSchoolNatureMaster;
   }
  
   @ManyToOne(fetch = FetchType.EAGER)
   @JoinColumn(name = "district_id", nullable = false, insertable = false, updatable = false)
   public AopTeachersDistrictMaster getAopTeachersDistrictMaster() {
    return this.aopTeachersDistrictMaster;
   }
  
   public void setAopTeachersDistrictMaster(
     AopTeachersDistrictMaster aopTeachersDistrictMaster) {
    this.aopTeachersDistrictMaster = aopTeachersDistrictMaster;
   }
  
   @Column(name = "school_name", length = 50)
   public String getSchoolName() {
    return this.schoolName;
   }
  
   public void setSchoolName(String schoolName) {
    this.schoolName = schoolName;
   }
  
   @Column(name = "school_address")
   public String getSchoolAddress() {
    return this.schoolAddress;
   }
  
   public void setSchoolAddress(String schoolAddress) {
    this.schoolAddress = schoolAddress;
   }
  
   @Column(name = "school_phone_number", length = 12)
   public String getSchoolPhoneNumber() {
    return this.schoolPhoneNumber;
   }
  
   public void setSchoolPhoneNumber(String schoolPhoneNumber) {
    this.schoolPhoneNumber = schoolPhoneNumber;
   }
  
   @Temporal(TemporalType.DATE)
   @Column(name = "establishment_date", length = 13)
   public Date getEstablishmentDate() {
    return this.establishmentDate;
   }
  
   public void setEstablishmentDate(Date establishmentDate) {
    this.establishmentDate = establishmentDate;
   }
  
   @Column(name = "school_no_of_teachers")
   public Integer getSchoolNoOfTeachers() {
    return this.schoolNoOfTeachers;
   }
  
   public void setSchoolNoOfTeachers(Integer schoolNoOfTeachers) {
    this.schoolNoOfTeachers = schoolNoOfTeachers;
   }
  
   @Column(name = "school_no_of_students")
   public Integer getSchoolNoOfStudents() {
    return this.schoolNoOfStudents;
   }
  
   public void setSchoolNoOfStudents(Integer schoolNoOfStudents) {
    this.schoolNoOfStudents = schoolNoOfStudents;
   }
  
  }
  
  </code>
  </pre>
  
  <p>Here is the embedded PK class.</p>
  
  <pre>
  <code>
  /**
   * SchoolmasterId generated by hbm2java
   */
  @Embeddable
  public class SchoolmasterId  implements java.io.Serializable {
  
  
       private long id;
       private long districtId;
       private long typeOfSchool;
  
      public SchoolmasterId() {
      }
  
      public SchoolmasterId(long id, long districtId, long typeOfSchool) {
         this.id = id;
         this.districtId = districtId;
         this.typeOfSchool = typeOfSchool;
      }
  
  
      @Column(name="id", nullable=false)
      @GeneratedValue(strategy=GenerationType.SEQUENCE)
      public long getId() {
          return this.id;
      }
  
      public void setId(long id) {
          this.id = id;
      }
  
      @NaturalId
      @Column(name="district_id", nullable=false)
      public long getDistrictId() {
          return this.districtId;
      }
  
      public void setDistrictId(long districtId) {
          this.districtId = districtId;
      }
      @NaturalId
      @Column(name="type_of_school", nullable=false)
      public long getTypeOfSchool() {
          return this.typeOfSchool;
      }
  
      public void setTypeOfSchool(long typeOfSchool) {
          this.typeOfSchool = typeOfSchool;
      }
  
  
     public boolean equals(Object other) {
           if ( (this == other ) ) return true;
     if ( (other == null ) ) return false;
     if ( !(other instanceof SchoolmasterId) ) return false;
     SchoolmasterId castOther = ( SchoolmasterId ) other; 
  
     return (this.getId()==castOther.getId())
   && (this.getDistrictId()==castOther.getDistrictId())
   && (this.getTypeOfSchool()==castOther.getTypeOfSchool());
     }
  
     public int hashCode() {
           int result = 17;
  
           result = 37 * result + (int) this.getId();
           result = 37 * result + (int) this.getDistrictId();
           result = 37 * result + (int) this.getTypeOfSchool();
           return result;
     }   
  
  
  }
  
  </code>
  </pre>
  
  <p>Here I am expecting the Id to be autogenerated...
  I have only added </p>
  
  <pre>
  <code>
  @NaturalId
  </code>
  </pre>
  
  <p>and </p>
  
  <pre>
  <code>
  @GeneratedValue(strategy=GenerationType.SEQUENCE)
  </code>
  </pre>
  
  <p>I have also tried with GenerationType.AUTO
  but did not work.
  Please suggest.</p>