I've posted this message in another forum yet, but i got no answer..After a futher week of research i can't already explain this topic.. hope someone helps this time...

SELECT OBJECT(m) FROM Message AS m
WHERE ( ?1 IS NULL)

At deploytime JBoss said:

Depends On Me: org.jboss.deployment.DeploymentException: Error compiling EJB-QL statement 'SELECT OBJECT(m) FROM Message AS
m
WHERE ( ?1 IS NULL)'; - nested throwable: (org.jboss.ejb.plugins.cmp.ejbql.ParseException: Encountered "IS" at line 2, column
12.
Was expecting one of:
")" ...
"+" ...
"-" ...
"*" ...
"/" ...
"NOT" ...
"BETWEEN" ...
)]

I read the EJBQL-Reference but the grammar seems to allow something like that..

You can replace (?1 is null) with (?1 = 0) or similiar, always the same result..

What's wrong??