[OPENJPA-2578] criteria API "group by" creates SQL with a parameter for a literal but does not provide it's value

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.4.0
• Component/s: criteria
• Assignee: Unassigned
• Reporter: Vermeulen
• Created: 23/Apr/15 13:51
• Updated: 05/Aug/17 03:54

Description

I have a query created using the criteria API where I group by an expression that contains a small calculation using literal values.

OpenJPA generates the correct SQL but does not provide the value of the generated parameter in the group by clause. The query fails with a SQL exception similar to "The value is not set for the parameter number 9.".

I can reproduce the issue with a minimal example (see attachment) where I create a person class with integer age and length columns and try to select the average length grouped by the person's age / 10.

Whe running this query with trace and displaying parameters I get:

1067 testPU TRACE [main] openjpa.Query - Executing query: Query: org.apache.openjpa.kernel.QueryImpl@be4f81; candidate class: class entities.Person; query: null
1108 testPU TRACE [main] openjpa.jdbc.SQL - <t 5763249, conn 7326702> executing prepstmnt 26531336 SELECT AVG(t0.length) FROM Person t0 WHERE (t0.age > ?) GROUP BY (t0.age / ?) [params=(int) 20]

You can clearly see that the query has two parameter placeholders but only one value is provided.

As a workaround I can call setHint("openjpa.hint.UseLiteralInSQL", "true") on em.createQuery(query). (Which requires OpenJPA 2.4.0 when using boolean literals, see OPENJPA-2534.)