inserting value in mapped colom

[kaviarasu]

hi im using thre tables table 1 which is a primary table which has two secondry tables table 2 and table 3
i want to insert the values to the secondry table table3 which colom is mapped to primary table using manyto one annotation

Table structure
Table1
1)Productid
2)ReviewId-primary key

table3
1)Commentid---primarykey
2)reviewid--mapped with primary table
3)comments
table2
1)userentryid------primarykey
2)2)reviewid--mapped with primary table

i want to insert value in table3 only where the commentid is autogenerated
and userid is get from the session
but i cant able to set review id because it is mapped as oblect
how to insert the value

the example code is

@Table(name="TBL_REVIEWS")
public class TblReviews implements Serializable {
 @Id
 @GeneratedValue(generator="SeqID")
 @SequenceGenerator(name="SeqID",sequenceName="TBL_REVIEWS_SEQ",allocationSize=1)
 @Column(name="REVIEW_ENTRY_ID")
 private Long reviewEntryId;

@OneToMany(mappedBy="reviewEntryId",fetch=FetchType.EAGER,cascade={CascadeType.ALL})
 private Set<TblComments> tblCommentsCollection;


public Set<TblComments> getTblCommentsCollection() {
 return this.tblCommentsCollection;
 }

 public void setTblCommentsCollection(Set<TblComments> tblCommentsCollection) {
 this.tblCommentsCollection = tblCommentsCollection;
 }
//other getters and setters

@Table(name="TBL_COMMENTS")
@Name("tblcomm")
public class TblComments implements Serializable {
 @Id
 @GeneratedValue(generator="SeqID")
 @SequenceGenerator(name="SeqID",sequenceName="TBL_COMMENTS_SEQ",allocationSize=1)
 @Column(name="COMMENTS_ID")
 private Long commentsId;

private String comments;
@ManyToOne
 @JoinColumn(name="REVIEW_ENTRY_ID")
 private TblReviews reviewEntryId;
//other getters and setters

public TblReviews getReviewEntryId() {
 return this.reviewEntryId;
 }

 public void setReviewEntryId(TblReviews wEntrreviewEntryIdyId) {
 this.reviewEntryId = wEntrreviewEntryIdyId;
 }

when i try the code like this

@In(required=false)
 TblReviews tr=new TblReviews();

@In(required=false)
 TblComments tblcomm;
 @Out(required=false)
 @RequestParameter
 Long rid4comm; (review entry id value)

public void writeComment() {
tblcomm.setReviewEntryId(tr);
em.persist(tblcomm);
}

it inserting the other values except reviewentryid in secondry table
how to achive it
thank u regards
kaviarasu