[news.eclipse.rt.eclipselink] Re: Unknown entity type

[james.sutherland@xxxxxxxxxx (James )]

This is an odd error, it seems your classpath may be corrupt, or have 
issues.  Are you in a basic JSE environment, or are you using something 
like Spring or OSGI?

EclipseLink 2.0 has been extensively tested in a JSE environment, so there 
is something wrong with your configuration.  Is your persistence unit in a 
jar?  It should be deployed in a jar with the persistence.xml in the 
META-INF directory and the entity classes inside their correct packages in 
the jar.

Your error says, "select object(o) from DiscountCode as o"

But your code has, "SELECT d FROM DiscountCode d"

So it seems your have your classes on the classpath twice, or something is 
corrupt in your environment.

Perhaps try one of the EclipseLink examples first.

---
James