JTS geometry being bound to byte array instead of PGgeometry

Hi there,

we have a project setup with Hibernate 4 and Hibernate Spatial using a Postgresql database with the PostGIS extension. Currently we are migrating to Hibernate 5 and ran into an issue with parameter binding.
In Hibernate 4 JTS geometries will be bound to type PGgeometry by org.hibernate.spatial.dialect.postgis.PGGeometryValueBinder in org.hibernate.spatial.dialect.AbstractJTSGeometryValueBinder#bind. But in Hibernate 5 JTS geometries will be converted to geolatte geometries which then are converted to a WKB, i.e. a byte array, and the parameter is bound to that byte array (all in org.hibernate.spatial.dialect.postgis.PGGeometryTypeDescriptor).
This causes two problems on our side. When using the function 'buffer' in a JPQL statement we get an error:

org.postgresql.util.PSQLException: ERROR: function st_buffer(bytea, integer) is not unique
Hinweis: Could not choose a best candidate function. You might need to add explicit type casts.

And JDBCDSLOG, which we are using, cannot log geometry parameters as WKT anymore as it only receives a byte array.

Is it possible to enforce Hibernate to use PGgeometry objects instead of byte arrays? Or could the old behaviour of Hibernate 4 be reimplemented?

Kind regards,
Marko Skocibusic