Caused by: org.qi4j.api.service.ServiceUnavailableException: ??Could not 
activate service indexing-sql??
        at 
org.qi4j.runtime.service.ServiceReferenceInstance.getInstance(ServiceReferenceInstance.java:166)
        at 
org.qi4j.runtime.service.ServiceReferenceInstance.activate(ServiceReferenceInstance.java:114)
        at 
org.qi4j.runtime.activation.ActivationDelegate.activate(ActivationDelegate.java:112)
        ... 17 more
Caused by: org.qi4j.api.activation.ActivationException: Unable to Activate 
application.
        at 
org.qi4j.runtime.activation.ActivationDelegate.activate(ActivationDelegate.java:152)
        at 
org.qi4j.runtime.activation.ActivationDelegate.activate(ActivationDelegate.java:75)
        at 
org.qi4j.runtime.service.ServiceReferenceInstance.getInstance(ServiceReferenceInstance.java:154)
        ... 19 more
Caused by: org.postgresql.util.PSQLException: ??ERROR: duplicate key value 
violates unique constraint "entity_types_entity_type_name_key"??
  ??Key (entity_type_name)=(org.qi4j.api.entity.EntityComposite) already exists.


I'm learning on the ??sql-support?? sample. I'm using 
org.qi4j.extension.indexing-sql and org.qi4j.extension.entitystore-sql, both 
postgrseql as backend. I seems that If I declare more than two entities, it 
will throw this exception. I found that org.qi4j.api.entity.EntityComposite 
exists in the table ??entity_types??? Is this a bug or ? 
Thanks a lot.

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