P ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYTJlNDRhYzZk... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-13927?atlOrigin=eyJpIjoiYTJlND... ) HHH-13927 ( https://hibernate.atlassian.net/browse/HHH-13927?atlOrigin=eyJpIjoiYTJlND... ) Problem with JPA converters ( https://hibernate.atlassian.net/browse/HHH-13927?atlOrigin=eyJpIjoiYTJlND... ) Change By: P ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) I have an entity that has uses converter @Column(name = "STATE_ID") @Convert(converter = StateConverter.class) private State state; When I use hibernate-core-5.4.14-SNAPSHOT.jar everything works fine and there is no any exceptions. However, when I tried to use hibernate-core-6.0.0.Alpha4.jar I get the following: {code:java} java.lang.NullPointerException: null at org.hibernate.type.TypeHelper.lambda$static$0(TypeHelper.java:43) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.type.TypeHelper.lambda$deepCopy$1(TypeHelper.java:72) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.metamodel.mapping.EntityMappingType.lambda$visitStateArrayContributors$0(EntityMappingType.java:204) ~[hibernate-core-6.0.0.Alpha4.jar:?] at java.util.ArrayList.forEach(ArrayList.java:1510) ~[?:?] at org.hibernate.persister.entity.AbstractEntityPersister.visitAttributeMappings(AbstractEntityPersister.java:5676) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.metamodel.mapping.EntityMappingType.visitStateArrayContributors(EntityMappingType.java:203) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.type.TypeHelper.deepCopy(TypeHelper.java:68) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.type.TypeHelper.deepCopy(TypeHelper.java:53) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.results.graph.entity.AbstractEntityInitializer.initializeInstance(AbstractEntityInitializer.java:592) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.results.internal.StandardRowReader.coordinateInitializers(StandardRowReader.java:150) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.results.internal.StandardRowReader.readRow(StandardRowReader.java:84) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:57) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:23) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.executeQuery(JdbcSelectExecutorStandardImpl.java:191) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.list(JdbcSelectExecutorStandardImpl.java:71) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.performList(ConcreteSqmSelectQueryPlan.java:165) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.query.sqm.internal.QuerySqmImpl.doList(QuerySqmImpl.java:413) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.query.spi.AbstractQuery.list(AbstractQuery.java:1356) ~[hibernate-core-6.0.0.Alpha4.jar:?] at org.hibernate.query.Query.getResultList(Query.java:136) ~[hibernate-core-6.0.0.Alpha4.jar:?] {code} ( https://hibernate.atlassian.net/browse/HHH-13927#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-13927#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100124- sha1:7217f9f )