For the record, the serialization requirement on HSQuery seems to have been introduced in HSEARCH-785 Closed . So it was initially an Infinispan requirement. But there might be other requirements (Seam integration for instance).

[1:52 PM] Sanne Grinovero: @emmanuel history lessons needed here.. was it related to JPA and/or Seam that a Query needs to be Serializable? Still a requirement?
[2:02 PM] Emmanuel Bernard: @Sanne @yoann hum, interesting. I don't think that it is a JPA requirement. It might indeed be related to Seam and the fact that long running conversation were passivatable EJB?
[2:02 PM] Emmanuel Bernard: I know entities had to be serializabion to serialize the persistence context
[2:02 PM] Emmanuel Bernard: but I did not know that extended to queries

Moving this ticket to 6.0 in order to avoid breaking things in a minor version.