Please help me........for writing enititybean with persistent state

Question

I am new person in ejb,actually i am working on one module where ejb deployment
is there in websphere 4.0 with oracle database ,where as my module form is just retrieving
data from database for user but doest not create it.So according to sun specification
entity bean should have create() and findByPrimaryKey() methods but in my case i have to
just retrieve data i.e findByAllData(). Here i am passing a parameter institute_id,
which is not a primarykey in this table which retrives records under that particular institute id
but in my case entitybean doesn't initialize to any particular
primary id since create() method is not existing in my bean so container doesn't
have any account of primary key.So now it won't store the data in persistent
state in the container because of none of the create() method for primarykey.But
we want to store the data in entity bean in the appliaction server in the persistent
state so how it can be done.
==========================================
My databse table is :
Table ims_class_mst
columns class_id(primarykey),class_name,priority,institute_id
=============================================
My home interface is
public interface StcaHome extends javax.ejb.EJBHome {
public Collection findByAllPrimaryKey(Integer institute_id)
throws FinderException, RemoteException;
//collection is returning class_id,class_name through class stcakey and in parameter
//is institute_id
=======================================================================
My bean is:
public class StcaBean implements javax.ejb.EntityBean {
public int class_id;
public String class_name;
public int institute_id;
EntityContext ctx=null;
     public Collection ejbFindByAllPrimaryKey(Integer pk)throws FinderException
          Connection con = null;
          try{
               con = getConnection();
               PreparedStatement ps=con.prepareStatement("select class_id,class_name from ims_class_mst where institute_id = ?");
               ps.setInt(1,pk.intValue());
               ResultSet rs=ps.executeQuery();
               LinkedList queryMatches=new LinkedList();
               while(rs.next())
                    StcaKey stcakey=new StcaKey(rs.getString(1),rs.getString(2));
                    queryMatches.add(stcakey);
               rs.close();
               ps.close();
               return queryMatches;
          }catch(SQLException sqle)
               throw new EJBException(sqle);
          }finally{
               try{
                    if(con!=null)
                         con.close();
               }catch(SQLException sqle)
     private Connection getConnection()
          try{
               Context context = new InitialContext();
               DataSource datasource = (DataSource) context.lookup("java:comp/env/jdbc/SyllabusDB");
               return datasource.getConnection();
          }catch(javax.naming.NamingException namingexception)
               namingexception.printStackTrace();
               throw new EJBException(namingexception);
          }catch(java.sql.SQLException sqle)
               sqle.printStackTrace();
               throw new EJBException(sqle);
public int getClassId() {
return class_id;
public String getClassName() {
return class_name;
public void setEntityContext(EntityContext ctx) {
this.ctx=ctx;
public void unsetEntityContext() {
ctx=null;
public void ejbLoad() {
// Not implemented.
public void ejbStore() {
// Not implemented.
public void ejbRemove() {
// Not implemented.
==================================================================
My remote interface is
public interface Stca extends javax.ejb.EJBObject {
public int getClassId() throws RemoteException;
public String getClassName() throws RemoteException;
==================================================================
My primary key class is:
public class StcaKey implements java.io.Serializable
public String class_id;
public String class_name;
public StcaKey() {}
public StcaKey(java.lang.String class_id,java.lang.String class_name) {
this.class_id = class_id;
this.class_name = class_name;
public boolean equals(Object obj) {
if (obj instanceof StcaKey)
StcaKey otherKey = (StcaKey) obj;
return ((class_id.equals(otherKey.class_id)) && (class_name.equals(otherKey.class_name)));
else
return false;
public int hashCode() {
return ((class_id+class_name).hashCode());
==================================================================

Answer 1

Implement Load and Store methods .Data will be persisted.
-Viren Jasani