Sandra Renaud [https://community.jboss.org/people/joploya] created the 
discussion

"Re: Human task + HornetQ + persistence + MySQL => ununderstanding stacktrace"

To view the discussion, visit: https://community.jboss.org/message/772527#772527

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After searching, I found that the main problem comes from the GeneratorId of 
Task.

> @ 
> http://grepcode.com/file/repo1.maven.org/maven2/javax.persistence/persistence-api/1.0/javax/persistence/Entity.java#Entity
>  Entity
> public class Task implements  
> http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/io/Externalizable.java#Externalizable
>  Externalizable {
>      @ 
> http://grepcode.com/file/repo1.maven.org/maven2/javax.persistence/persistence-api/1.0/javax/persistence/Id.java#Id
>  Id
>      @ 
> http://grepcode.com/file/repo1.maven.org/maven2/javax.persistence/persistence-api/1.0/javax/persistence/GeneratedValue.java#GeneratedValue
>  GeneratedValue(strategy =  
> http://grepcode.com/file/repo1.maven.org/maven2/javax.persistence/persistence-api/1.0/javax/persistence/GenerationType.java#GenerationType.0AUTO
>  GenerationType.AUTO 
> (http://grepcode.com/file/repo1.maven.org/maven2/javax.persistence/persistence-api/1.0/javax/persistence/GenerationType.java#GenerationType.0AUTO))
>      private long id;


The AUTO GenerationType let MySQL choose how to implements the id generation. 
But the created table have no autoIncrement option and no default value.

If I add manually a defaut value I obtain an error like 
> Caused by: org.hibernate.HibernateException: The database returned no 
> natively generated identity value

I could check manually the option "Auto increment" in MySQL but I would like to 
do this automatically at the tables creation. But how can I do that without 
change the GenerationType to IDENTITY?
Should I change the Taskorm.xml like for jbpm-console?

Thanks to help.
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