Error when deploying an CMP-Entity EJB

Question

Hi ,
I am unable to deploy a simple example of CMP ,when i select Entity,then select Deployment Settings->Generate Default SQL,
My SQL Query is:'SELECT OBJECT(p) FROM Product p' for FfindAllProducts().
I get the error message:
ERROR:while generating SQL.
The SELECT clause has a return type that does not match the return type
of the select query for which it is defined
EJB QL statement: 'SELECT OBJECT(p)fROM Product p'
EJB QL method:public abstract java.util.Collection com.aa.ProductHome.findAllProducts() throws javax.ejb.FinderException,java.rmi.RemoteException.
Followinng are the codes of My bean
ProductHome.java
import javax.ejb.*;
import java.rmi.RemoteException;
import java.util.Collection;
public interface ProductHome extends EJBHome
Product create(String productId,String name , String description , double basePrice) throws CreateException,RemoteException;
public Product findByPrimaryKey(ProductPK key) throws FinderException,RemoteException;
public Collection findByName(String name) throws FinderException,RemoteException;
public Collection findByDescription(String description) throws FinderException,RemoteException;
public Collection findAllProducts() throws FinderException,RemoteException;
ProductBean.java
import javax.ejb.*;
import java.rmi.RemoteException;
public class ProductBean implements EntityBean
protected EntityContext ctx;
public String productid;
public String name;
public String description;
public ProductBean()
public String getName() throws RemoteException
return this.name;
public void setName(String name) throws RemoteException
this.name=name;
public String getDescription() throws RemoteException
return this.description;
public void setDescription(String description) throws RemoteException
this.description=description;
public String getProductId() throws RemoteException
return this.productid;
public void setProductId(String ProductId) throws RemoteException
this.productid=ProductId;
public void ejbActivate()
public void ejbPassivate()
public void ejbRemove()
public void ejbLoad()
public void ejbStore()
public void setEntityContext(EntityContext ctx)
this.ctx = ctx;
public void unsetEntityContext()
this.ctx = null;
public void ejbPostCreate(String productId,String name,String description,double baseprice)
public ProductPK ejbCreate(String productId,String name,String description,double baseprice) throws CreateException,RemoteException
called ");
setName(name);
setProductId(productId);
setDescription(description);
return null;
Product.java
import javax.ejb.*;
import java.rmi.RemoteException;
public interface Product extends EJBObject
public String getName() throws RemoteException;
public void setName(String name) throws RemoteException;
public String getDescription() throws RemoteException;
public void setDescription(String description) throws RemoteException;
public String getProductId() throws RemoteException;
public void setProductId(String productid) throws RemoteException;
ProductClient.java
import java.rmi.*;
import javax.rmi.*;
import javax.naming.*;
import javax.ejb.*;
import java.util.*;
public class ProductClient
public static void main(String ars[])
ProductHome home=null;
try
Context initial = new InitialContext();
Context myEnv = (Context)initial.lookup("java:comp/env");
Object objref = myEnv.lookup("ejb/TheProduct");
home = (ProductHome)PortableRemoteObject.narrow(objref,ProductHome.class);
home.create("123-446-7890","p5-350","350 Mhz Pentium",200 );
home.create("123-446-7891","p5-400","400 Mhz Pentium",300 );
home.create("123-446-7892","p5-450","450 Mhz Pentium",400 );
home.create("123-446-7893","p5-500","500 Mhz Pentium",500 );
home.create("123-446-7894","p5-550","550 Mhz Pentium",600 );
Iterator i = home.findByName("p5-400").iterator();
System.out.println(" Product Match the name of p5-400 " );
if ( i.hasNext() )
Product prod = (Product)PortableRemoteObject.narrow(i.next(),Product.class);
System.out.println(prod.getDescription());
else
throw new Exception(" Could not find Product ");
catch(Exception e)
System.out.println("Caught Exception " );
e.printStackTrace();
finally
if ( home != null)
System.out.println(" Destroying all products " );
try
Iterator i = home.findAllProducts().iterator();
while ( i.hasNext() )
Product prod = (Product)PortableRemoteObject.narrow(i.next(),Product.class);
if (prod.getProductId().startsWith("123"))
prod.remove();
catch (Exception e)
e.printStackTrace();
ProductPk.java
import java.io.Serializable;
public class ProductPK implements java.io.Serializable
public String ProductId ;
public ProductPK(String id)
this.ProductId = id;
public ProductPK()
public String toString()
return ProductId;
public int hashCode()
return ProductId.hashCode();
public boolean equals(Object Product)
return ((ProductPK)Product).ProductId.equals(ProductId);

Answer 1

can u pls tell me u are using ejb1.1 specifications or ejb2.0 specifications.in both cases pls shoe u are descripters so that i can check.