Aliases expected length is 0; actual length is 1 on hibernate query cache

Question

String q1Str = \"SELECT parent_id FROM meta WHERE st_id = \"+childIds+\";\";
Query q1 = em.createNativeQuery(q1Str);
//q1.setHint(\"org.hibernate.cacheable\", true);         


        

Answer 1

So, this happened to me too and after searching / researching a possible solution I've decided to give up, but after a very long debug session (not Session.class) I stumbled upon a solution.

And so... The environment

hibernate-core 5.3.0.Final

Wildfly 20.0.1 Final

Java 11

PostgreSql 9.4 ? (don't know the exact version, sorry)

Infinispan for caching

So, first using

em.createNamedQuery("MyClass.findMyStuff", Tuple.class)
            .setParameter(0, declarationDate)
            .setHint("org.hibernate.cacheable", true)
            .getResultList()

I received an error similar to this

aliases expected length is 0; actual length is 1

but, of course, with different numbers (instead of 0 and 1)

Note: my native sql was like this

select a.date as mydate, a.id as myid, a.test as mytest from mytable a where date = ?0

And so, something smelly hit the fan...

Tried this

em.createNamedQuery("MyClass.findMyStuff", Tuple.class)
            .setParameter(0, declarationDate)
            .setHint("org.hibernate.cacheable", true)
            .unwrap(NativeQuery.class)
            .addSynchronizedQuerySpace("myQuery_space")
            .getResultList()

and I failed... Tried this same stuff with all addSynchronized methods available in NativeQuery.class, but each and every time hibernate was telling me to go and fun myself.

Then I tried rewriting my query with HQL, but good luck with that... Rewriting all these subselects, joins and what not in HQL was just a wishful thinking - NOT POSSIBLE (in my case. Note that resources I have are limited).

Got back to where I've started... And changed this

em.createNamedQuery("MyClass.findMyStuff", Tuple.class)
            .setParameter(0, declarationDate)
            .setHint("org.hibernate.cacheable", true)
            .unwrap(NativeQuery.class)
            .addSynchronizedQuerySpace("myQuery_space")
            .getResultList()

to

em.createNamedQuery("MyClass.findMyStuff", Tuple.class)
            .setParameter(0, declarationDate)
            .setHint("org.hibernate.cacheable", true)
            .unwrap(NativeQuery.class)
            .addScalar("mydate")
            .getResultList()

and got the same error similar to

aliases expected length is 0; actual length is 1

And then I tried this

em.createNamedQuery("MyClass.findMyStuff", Tuple.class)
            .setParameter(0, declarationDate)
            .setHint("org.hibernate.cacheable", true)
            .unwrap(NativeQuery.class)
            .addScalar("mydate", new DateType())
            .getResultList()

And BAAAAAAM finally it started working.

To sum it up it started working then I unwrapped query to NativeQuery and added scalar with a type!!!

Note if your native query does not have aliases then add them!!!

Related threads (to name a few)

https://hibernate.atlassian.net/browse/HHH-9111

Hibernate Ehcache NOT working for SQL Native query cache

https://csharp.developreference.com/article/10137305/Cacheable+JPA+Native+Query+IlligalStateException+%E2%80%9Caliases+expected+length+is+0%3B+actual+length+is+1%E2%80%9D

Hibernate query cache applicable for native queries?

Cache JPA Native Query

Hope that this solution helps other lost souls.

LOL... had to create this one time account to post this answer

Answer 2

I think this happens when the queried table does not have a primary key.