# org.hibernate.query.SemanticException Cannot assign expression of type 'java.io.Serializable' to target path 'alias\_1388715014.customProperties' of type 'java.util.Map\<java.lang.String, java.lang.String\>'

**URL:** <https://discourse.hibernate.org/t/org-hibernate-query-semanticexception-cannot-assign-expression-of-type-java-io-serializable-to-target-path-alias-1388715014-customproperties-of-type-java-util-map-java-lang-string-java-lang-string/9094>\
**Category:** Hibernate ORM\
**Created:** [February 25, 2024, 6:00pm UTC](https://discourse.hibernate.org/t/org-hibernate-query-semanticexception-cannot-assign-expression-of-type-java-io-serializable-to-target-path-alias-1388715014-customproperties-of-type-java-util-map-java-lang-string-java-lang-string/9094 "2024-02-25T18:00:03Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Deepak\_Thankachan](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/deepak_thankachan/32/3051_2.png) [@Deepak\_Thankachan](https://discourse.hibernate.org/u/Deepak_Thankachan)\
**Post date:** [February 26, 2024, 11:14am UTC](https://discourse.hibernate.org/t/org-hibernate-query-semanticexception-cannot-assign-expression-of-type-java-io-serializable-to-target-path-alias-1388715014-customproperties-of-type-java-util-map-java-lang-string-java-lang-string/9094/4 "2024-02-26T11:14:50Z")

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Digging into this a bit more it looks like I started seeing this issue when Hibernate version went from 6.1 to 6.2. I saw the [hibernate 6.2 migration guide](https://github.com/hibernate/hibernate-orm/blob/6.2/migration-guide.adoc) and it does mention something about JSON mapping changes. I am using a postgres DB and the data is stored as jsonb. Looks like someone already raised this too [Mapping Jsonb (postgres) in 6.2.3.Final](https://discourse.hibernate.org/t/mapping-jsonb-postgres-in-6-2-3-final/8431)

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