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From "Marc Prud'hommeaux (JIRA)" <>
Subject [jira] Created: (OPENJPA-196) Ease the restrictions on forcing a matche between the number of declared and assigned positional parameters
Date Sun, 01 Apr 2007 16:28:32 GMT
Ease the restrictions on forcing a matche between the number of declared and assigned positional

                 Key: OPENJPA-196
             Project: OpenJPA
          Issue Type: Improvement
          Components: query
    Affects Versions: 0.9.6, 0.9.0
            Reporter: Marc Prud'hommeaux
         Assigned To: Marc Prud'hommeaux
            Priority: Minor

OpenJPA currently enforces that each positional parameter that is assigned in a query must
actually be declared in that query, although the spec doesn't actually seem to mention that

As respoted by Dain Sundstorm on the OpenJPA mailing list:

Actually, I think there is a bigger problem...  Say I have a query like this:

    SELECT x FROM foo AS x WHERE = ?2

The org.apache.openjpa.kernel.QueryImpl.assertParameters(...) code assumes that if I have
1 parameter it is numbered ?1, but in EJB 2.1 this was not a requirement and there are certification
tests that verify you are allowed to have "unused" parameters (e.g, in my example about ?1
and ?N where N>2 are all not used).  I couldn't find any text in the specification that
says that all all positional parameters must be used in the query, but I did find text that
say the EJB-QL 3.0 language is an extension of the EJB-QL 2.1 language:

"The Java Persistence query language is an extension of the Enterprise Java Beans query language,
EJB QL, definedin[5]."

So I think we must remove the "extra-params" check, but I would be happy with a "don't check
for extra-params flag".


On Mar 31, 2007, at 8:56 AM, Dain Sundstrom wrote:

I'm working on a CMP 2 implementation that delegates to OpenJPA for persistence.  I'm running
into a problem where I get the following exception:

org.apache.openjpa.persistence.ArgumentException : More parameters were passed to execute()
than were declared: 4 parameters were specified for query execution, but only 2 parameters
were declared in the query.

In CMP you declare finder and select methods that have parameters which are passed into the
query engine.  You can have as many parameters as you like but are not required to use them
all, but it appears that OpenJPA is enforcing a restriction where if the EJB-QL text only
lists say 2 parameters and I set 4 I get the above exception.  In order of perference:

Is this spec required? If not, can we remove the check?

Is there a way to disable the check?  If so, how?

Is there a way to determine the number of paramters a query takes?  If so, I can change my

Is there a way to get the ejbql text from a Query object? If so, I'll write a quick parser
to determine number of queries myself.

BTW, I'm currently using 0.9.6.



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