[Hibernate-issues] [Hibernate-JIRA] Commented: (HB-377) Hibernate 2.1 appears to break jcs caching

[<leg...@at...>]

The following comment has been added to this issue:

     Author: tekno
    Created: Fri, 3 Oct 2003 6:06 AM
       Body:
The main method i use is 

	public static void main(String[] args) throws Exception {
		Properties props = new Properties();
		props.setProperty("hibernate.connection.driver_class", "org.postgresql.Driver");
		props.setProperty("hibernate.connection.url", "jdbc:postgresql://lab-dev/LABDEV2");
		props.setProperty("hibernate.connection.username", "postgres");
		props.setProperty("hibernate.show_sql", "true");
		Session session = null;
		Customer customer = null;
		SessionFactory factory = null;
		try {
			// build factory
			Configuration cfg =
				new Configuration().addClass(Customer.class).addClass(Employee.class).setProperties(props);
			factory = cfg.buildSessionFactory();

			System.out.println("Starting first session");// first session gets customer instance
			
			session = factory.openSession();
			customer = (Customer) session.load(Customer.class, new Long(1275));
			System.out.println("Loaded customer " + customer.getId());
			session.flush();
			session.connection().commit();
			session.close();
			
			// update the title field
			System.out.println("Updating field");
			customer.setTitle("MR");
			
			System.out.println("Starting second session");// second session persists update
			session = factory.openSession();
			session.update(customer);
			session.flush();
			session.connection().commit();
			session.close();

			System.out.println("Finished");
			factory.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if (session != null)
				session.close();
			if (factory != null)
				factory.close();
			System.exit(0);
		}
	}


The Customer class is 

public class Customer {

	private long id;
	private String title;
	private Employee created;

	public Customer() {
	}

	public void setId(long id) {
		this.id = id;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public long getId() {
		return id;
	}

	public Employee getCreated() {
		return created;
	}

	public void setCreated(Employee employee) {
		created = employee;
	}

}

with mapping

<hibernate-mapping>

    <class name="Customer" table="customers">
    
    	<jcs-cache usage="read-write"/>

        <id name="id" unsaved-value="0">
            <generator class="assigned"/>
        </id>
       	<property name="title"/>
		<many-to-one name="created" class="Employee" column="created_by"/>
    </class>
    
</hibernate-mapping>

and the employee class is

public class Employee {

	private long id;

	private String name;

	public Employee() {
	}

	public long getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public void setId(long id) {
		this.id = id;
	}

	public void setName(String name) {
		this.name = name;
	}

}
 with mapping

<hibernate-mapping>
    <class name="Employee" table="staff">
 
        <id name="id">
            <generator class="assigned"/>
        </id>      
        <property name="name"/>
   </class>  
</hibernate-mapping>

the ccf file i am using

jcs.default=DC
jcs.default.cacheattributes=org.apache.jcs.engine.CompositeCacheAttributes
jcs.default.cacheattributes.MaxObjects=2000
jcs.default.cacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache
jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes
jcs.default.elementattributes.IsEternal=false
jcs.default.elementattributes.MaxLifeSeconds=24000
jcs.default.elementattributes.IdleTime=180000
jcs.default.elementattributes.IsSpool=false
jcs.default.elementattributes.IsRemote=false
jcs.default.elementattributes.IsLateral=false

The database tables I think are pretty obvious
customers with id,tile,created_by and staff with id, name
created_by is a foreign key joining customers to staff

I initialize the db with

insert into staff(id,name) values(1,'test');
insert into customers(id,title,created_by) values(1,'test',1);

what else do you need?

---------------------------------------------------------------------
View the issue:

  http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-377


Here is an overview of the issue:
---------------------------------------------------------------------
        Key: HB-377
    Summary: Hibernate 2.1 appears to break jcs caching
       Type: Bug

     Status: Unassigned
   Priority: Major

    Project: Hibernate2
 Components: 
             core
   Versions:
             2.1

   Assignee: 
   Reporter: tekno

    Created: Thu, 2 Oct 2003 4:34 AM
    Updated: Thu, 2 Oct 2003 4:34 AM
Environment: Development Windows 2000 SP3, JSDK 4.1.2
Deployment Solaris 9
Database Postgresql 7.3

Description:
I am getting an AssertionFailure - cannot cache a reference to an object with a null id when I try to do an update. Here is the sample code -

NB: This has been working fine for me in hibernate versions 2.0 - 2.03

I have the following two mappings

<class name="Customer" table="customers" polymorphism="explicit">

<cache usage="read-write"/>

<id name="id" unsaved-value="0">
<generator class="sequence">
<param name="sequence">customers_id_seq</param>
</generator>
</id>

<property name="postcode"/>
<many-to-one name="csOwner" class="Employee" column="cs_owner" />
</class>

and

<class name="Employee" table="staff">

<id name="id">
<generator class="sequence">
<param name="sequence">staff_id_seq</param>
</generator>
</id>

<property name="name"/>
</class>

the following main() throws the exception

Session session = null;
Customer customer = null;
SessionFactory factory = null;
try {
// build factory
factory = new Configuration().configure().buildSessionFactory();

System.out.println("Starting first session");
// first session gets customer instance
session = factory.openSession();
customer = (Customer) session.load(Customer.class, new Long(1275));
System.out.println("Loaded customer " + customer.getId() + " has owner " + customer.getCsOwner().getId());
session.flush();
session.connection().commit();
session.close();
System.out.println("Updating address field");
// update a field
customer.setPostcode("TESTING");
System.out.println("Starting second session");
// second session persists update
session = factory.openSession();
session.update(customer);
session.flush();
session.connection().commit();
session.close();

System.out.println("Finished");
factory.close();
} catch (Exception ex){
ex.printStackTrace();
} finally {
if(session!=null)session.close();
if(factory!=null)factory.close();
System.exit(0);
}

If i remove the cache entry in the customer mapping everything is OK, but other wise i get

net.sf.hibernate.AssertionFailure: cannot cache a reference to an object with a null id
at net.sf.hibernate.type.EntityType.disassemble(EntityType.java:89)
at net.sf.hibernate.impl.CacheEntry.disassemble(CacheEntry.java:36)
at net.sf.hibernate.impl.CacheEntry.<init>(CacheEntry.java:27)
at net.sf.hibernate.impl.ScheduledUpdate.execute(ScheduledUpdate.java:42)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2278)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2235)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2178)
at com.lab.model.HibBug.main(HibBug.java:46)


---------------------------------------------------------------------
JIRA INFORMATION:
This message is automatically generated by JIRA.

If you think it was sent incorrectly contact one of the administrators:
   http://opensource.atlassian.com/projects/hibernate/secure/Administrators.jspa

If you want more information on JIRA, or have a bug to report see:
   http://www.atlassian.com/software/jira