Null Pointer exception thrown while deploying the cmp bean

[Maheswaran Devaraj]

Hi All,

I had written a cmp bean and tried to deploy it in jboss4.0.4GA, While deploying into the server it is throwing NullPointer exception. Can any one help me to resolve this. My code is following

 ProductHome.java

package cmp;

import java.rmi.RemoteException;
import java.util.Collection;

import javax.ejb.CreateException;
import javax.ejb.EJBHome;
import javax.ejb.FinderException;

public interface ProductHome extends EJBHome {

	Product create(String procutID,String name,String description,double price) throws 
	CreateException,RemoteException;
	
	public Product findByPrimaryKey(ProductPK pk) throws FinderException,RemoteException;
	public Collection findByName(String name) throws FinderException,RemoteException;
	public Collection findByDescription(String description) throws FinderException,RemoteException;
	public Collection findByBasePrice(double price) throws FinderException,RemoteException;
	public Collection findExpensiveProducts(double minPrice) throws FinderException,RemoteException;
	public Collection findCheapProducts(double maxPrice) throws FinderException,RemoteException;
	public Collection findAllProducts() throws FinderException,RemoteException;
	
}

Product.java
--------------

package cmp;

import java.rmi.RemoteException;

import javax.ejb.EJBObject;

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 double getBasePrice() throws RemoteException;
	public void setBasePrice(double price) throws RemoteException;
	public String getProductID() throws RemoteException;
	
}


ProductBean.java
--------------------

package cmp;

import java.rmi.RemoteException;

import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.EntityBean;
import javax.ejb.EntityContext;
import javax.ejb.RemoveException;

public abstract class ProductBean implements EntityBean {
	
	protected EntityContext ctx;
	
	public ProductBean(){
		
	}
	
	
	
	public abstract String getName();
	public abstract void setName(String name);
	public abstract String getDescription();
	public abstract void setDescription(String description);
	public abstract double getBasePrice();
	public abstract void setBasePrice(double price);
	public abstract String getProductID();
	public abstract void setProductID(String productID);
	
	

	public void ejbActivate() throws EJBException, RemoteException {
		System.out.println("ejb:Activate() Called");

	}

	public void ejbLoad() throws EJBException, RemoteException {
		System.out.println("ejbLoad() called");

	}

	public void ejbPassivate() throws EJBException, RemoteException {
		System.out.println("ejbPassivate() Called");

	}

	public void ejbRemove() throws RemoveException, EJBException,
			RemoteException {
		System.out.println("ejbRemove() called");

	}

	public void ejbStore() throws EJBException, RemoteException {
		System.out.println("ejbStore() called");

	}

	public void setEntityContext(EntityContext arg0) throws EJBException,
			RemoteException {
		System.out.println("setEntityContext() called");
		this.ctx = arg0;

	}

	public void unsetEntityContext() throws EJBException, RemoteException {
		System.out.println("unsetEntityContextCalled()");
		this.ctx = null;
	}
	
	public void ejbPostCreate(String productID,String name,String description,double basePrice){
		System.out.println("ejbPostCreate() called");
	}
	
	public ProductPK ejbCreate(String productID,String name, String description,double basePrice)
	throws CreateException{
		System.out.println("ejbCreate() called");
		setProductID(productID);
		setName(name);
		setDescription(description);
		setBasePrice(basePrice);
		return (new ProductPK(productID));
	}

}


My primary key class

ProductPk.java
-----------------
package cmp;

import java.io.Serializable;

public class ProductPK implements Serializable {
	
	public String productID;
	
	public ProductPK(){
		
	}
	
	public ProductPK(String productID){
		this.productID = productID;
	}

	public String toString(){
		return productID.toString();
	}
	
	public int hashCode(){
		return productID.hashCode();
	}
	
	public boolean equals(Object o){
		return ((ProductPK)o).productID.equals(productID);
	}
}



My Deployment Descriptor is
------------------------------------

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar id="ejb-jar_ID" version="2.1" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd">
	<display-name>
	ejb2</display-name>
<enterprise-beans>	
	  <entity>
	  		<ejb-name>Product</ejb-name>
	  		<home>cmp.ProductHome</home>
	  		<remote>cmp.Product</remote>
	  		<ejb-class>cmp.ProductBean</ejb-class>
	  		<persistence-type>Container</persistence-type>
	  		<prim-key-class>cmp.ProductPK</prim-key-class>
	  		
	  		<reentrant>False</reentrant>
	  		<cmp-version>2.x</cmp-version>
	  		<abstract-schema-name>ProductBean</abstract-schema-name>
	  		
	  		<cmp-filed>
	  			<field-name>productID</field-name>
	  		</cmp-filed>
	  		
	  		<cmp-filed>
	  			<field-name>name</field-name>
	  		</cmp-filed>
	  		
	  		<cmp-filed>
	  			<field-name>description</field-name>
	  		</cmp-filed>
	  		
	  		<cmp-filed>
	  			<field-name>basePrice</field-name>
	  		</cmp-filed>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findAllProducts</method-name>
	  				<method-params></method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE productID IS NOT NULL]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findByName</method-name>
	  				<method-params>
	  					<method-param>
	  						java.lang.String
	  					</method-param>
	  				</method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE name=?1]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findByDescription</method-name>
	  				<method-params>
	  					<method-param>
	  						java.lang.String
	  					</method-param>
	  				</method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE description=?1]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findByPrimaryKey</method-name>
	  				<method-params>
	  					<method-param>
	  						cmp.ProductPK
	  					</method-param>
	  				</method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE productID=?1]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findByBasePrice</method-name>
	  				<method-params>
	  					<method-param>
	  						double
	  					</method-param>
	  				</method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE basePrice=?1]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findExpensiveProducts</method-name>
	  				<method-params>
	  					<method-param>
	  						double
	  					</method-param>
	  				</method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE basePrice>?1]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		<query>
	  			<query-method>
	  				<method-name>findCheapProducts</method-name>
	  				<method-params>
	  					<method-param>
	  						double
	  					</method-param>
	  				</method-params>
	  			</query-method>
	  			
	  			<ejb-ql>
	  				<![CDATA[SELECT OBJECT(a) FROM ProductBean AS a WHERE basePrice><?1]]>
	  			</ejb-ql>
	  		</query>
	  		
	  		
	  </entity>
	  
</enterprise-beans>

<assemble-descriptor>
	<container-transaction>
		
		<method>
			<ejb-name>Product</ejb-name>
			<method-intf>Remote</method-intf>
			<method-name>*</method-name>
		</method>
		
		<trans-attribute>Required</trans-attribute>
		
	</container-transaction>
</assemble-descriptor>
</ejb-jar>

My jbosscmp-jdbc.xml
---------------------------

<?xml version='1.0' encoding='UTF-8'?>
<jbosscmp-jdbc>
	<defaults>
		<datasource>java:/MSSQLDS</datasource>
		<datasource-mapping>MS SQLSERVER</datasource-mapping>
		<create-table>false</create-table>
		<remove-table>false</remove-table>
	</defaults>
	
	<enterprisebeans>
		<entity>
			<ejb-name>Product</ejb-name>
			<table-name>product</table-name>
			<cmp-field>
				<field-name>name</field-name>
				<column-name>name</column-name>
			</cmp-field>
			
			<cmp-field>
				<field-name>description</field-name>
				<column-name>description</column-name>
			</cmp-field>
			
			<cmp-field>
				<field-name>basePrice</field-name>
				<column-name>basePrice</column-name>
			</cmp-field>
			
			<cmp-field>
				<field-name>productID</field-name>
				<column-name>productID</column-name>
			</cmp-field>
			
		</entity>
	</enterprisebeans>
	
</jbosscmp-jdbc>
    

Thanks & Regards,
Mahes