Hibernate : generated attribute of the property element

[Reddy Prashanth]

Hi,

I am started reading hibernate. In one of my examples,I mentioned the "generated" attribute of the "property" element as generated="always" as per the hibernate documentation and some other book. But getting the below parser error.

public class Student {

private Long id;
private String name;
private int age;
private Date updated;

// getters and setters
}


Mapping :

  <?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 package="com.test">
    <class name="Student" table="student">
    	<id name="id" column="s_id" >
    		<generator class="increment"></generator>
    	</id>
    	<property name="name" column="name" />
    	<property name="age" column="age" />
    	<property name="updated" column="LAST_MODIFIED" update="false" insert="false" generated="always"/>
    </class>    
</hibernate-mapping>
  

In my main class ...

   
SessionFactory sessionFact=HibernateUtil.getSessionFactory();
		Session session=sessionFact.openSession();
		session.beginTransaction();
		Student s=new Student();
		s.setName("Samuel");
		s.setAge(23);
		session.save(s);
		session.getTransaction().commit(); 

But I am getting the below error when I run the code :

 ERROR - Error parsing XML: XML InputStream(11) Attribute "generated" with value "always" must have a value from the list "true false ".
org.hibernate.MappingException: Could not read mappings from resource: com/test/Student.hbm.xml
	at org.hibernate.cfg.Configuration.addResource(Configuration.java:471)
	at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1404)
	at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1372)
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1353)
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1329)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1249)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1235)
	at com.util.HibernateUtil.<clinit>(HibernateUtil.java:16)
	at com.dao.EventManager.createAndStoreEvent(EventManager.java:20)
	at com.dao.EventManager.main(EventManager.java:16)
Caused by: org.hibernate.MappingException: invalid mapping
	at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:415)
.........
...
Caused by: org.xml.sax.SAXParseException: Attribute "generated" with value "always" must have a value from the list "true false ".
   

If I try with generated="true" as shown below, the IDE is reporting error but the code is running.

<property name="updated" column="LAST_MODIFIED" update="false" insert="false" generated="true"/>

In the hibernate-mapping-3.0.dtd file of the hibernate jar, I could see below lines :

<!ELEMENT property (meta*,(column|formula)*,type?)>
<!ATTLIST property name CDATA #REQUIRED>
<!ATTLIST property node CDATA #IMPLIED>
<!ATTLIST property access CDATA #IMPLIED>
<!ATTLIST property type CDATA #IMPLIED>
<!ATTLIST property column CDATA #IMPLIED>
<!ATTLIST property length CDATA #IMPLIED>
<!ATTLIST property precision CDATA #IMPLIED>
<!ATTLIST property scale CDATA #IMPLIED>
<!ATTLIST property not-null (true|false) #IMPLIED>
<!ATTLIST property unique (true|false) "false">
<!ATTLIST property unique-key CDATA #IMPLIED>
<!ATTLIST property index CDATA #IMPLIED> <!-- include the columns spanned by this property in an index -->
<!ATTLIST property update (true|false) #IMPLIED>
<!ATTLIST property insert (true|false) #IMPLIED>
<!ATTLIST property optimistic-lock (true|false) "true"> <!-- only supported for properties of a class (not component) -->
<!ATTLIST property formula CDATA #IMPLIED>
<!ATTLIST property lazy (true|false) "false">
<!ATTLIST property generated (true|false) "false">

Could some one please advice, what I am doing wrong. Does it mean the documentation is not correct or am I missing something ??

[Reddy Prashanth]

Hi,

I figured out the cause. The hibernate version configured in my IDE is old one (3.1.x) . I checked with 3.2.4 and it is working fine now