problem in parsing mapping document.

[Siddharth Bhargava]

I am implementing table per concrete class with unions. I have one Abstract class address and 2 subclasses inheriting from it namely - HomeAddess and OfficeAddess.

public abstract class Address {
 
public Address(){

}

public String city;
 
public int zipcode;
 
public String getCity() {
return city;
}
 
public void setCity(String city) {
this.city = city;
}
 
public int getZipcode() {
return zipcode;
}
 
public void setZipcode(int zipcode) {
this.zipcode = zipcode;
}
 
} 

  public class OfficeAddress extends Address{

private String officeAddress1;

private String officeAddress2;

public OfficeAddress(){

}
 
public String getOfficeAddress1() {
return officeAddress1;
}
 
public void setOfficeAddress1(String officeAddress1) {
this.officeAddress1 = officeAddress1;
}
 
public String getOfficeAddress2() {
return officeAddress2;
}
 
public void setOfficeAddress2(String officeAddress2) {
this.officeAddress2 = officeAddress2;
}


 
}  

This is my address.hbm.xml file

 
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 
<hibernate-mapping>

<class name="com.hibernateexample.inheritance.Address" abstract="true">

<id name="id" column="ADDRESS_ID" type="long">
<generator class="native"/>
</id>

<property name="city" column="CITY" type="string"/>
<property name="zipcode" column="ZIPCODE" type="integer"/>

<union-subclass name="com.hibernateexample.inheritance.HomeAddres" table="HOME_ADDRESS">
<property name="homeAddress1" column="HOME_ADDRESS1"/>
<property name="homeAddress1" column="HOME_ADDRESS2"/>
</union-subclass>

<union-subclass name="com.hibernateexample.inheritance.OfficeAddres" table="OFFICE_ADDRESS">
<property name="officeAddress1" column="OFFICE_ADDRESS1"/>
<property name="officeAddress2" column="OFFICE_ADDRESS2"/>
</union-subclass>

</class>
 
</hibernate-mapping>

The problem that i am getting on running the code is this :

Exception in thread "main" java.lang.NullPointerException
at com.hibernateexample.inheritance.SaveExample.main(SaveExample.java:47)
Could not parse mapping document from resource address.hbm.xml

Please help me out and tell me where i am going wrong ....

[Mark Spritzler]

Should

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

Have a "/" just before the ">"
?

Mark