[jboss-user] [jBPM] - Re: Human task + HornetQ + persistence + MySQL => ununderstanding stacktrace

Sandra Renaud do-not-reply at jboss.com
Fri Oct 26 05:15:13 EDT 2012


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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