Hi, I am in the process of migrating an application from Hibernate 5.7 to Hibernate 6.2 and I think I'm also affected by this issue.

I'm getting the same exception when loading an entity that contain lazy-loaded fields. As soon as I declare the fields non-lazy the exception disappear. I loading the entity in a single thread so no multithreading is involved.

The mapping is defined in HBM XML format. When I change the attribute "default-lazy" in the "hibernate-mapping" XML element from "true" to "false" the exception no longer is thrown.

The Stacktrace I'm getting with Hibernate 6.2.6 is

Caused by: java.lang.IllegalStateException: Illegal pop() with non-matching JdbcValuesSourceProcessingState
at org.hibernate.sql.results.spi.LoadContexts.deregister(LoadContexts.java:46)
at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:209)
at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:33)
at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.doExecuteQuery(JdbcSelectExecutorStandardImpl.java:362)
at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.executeQuery(JdbcSelectExecutorStandardImpl.java:168)
at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.list(JdbcSelectExecutorStandardImpl.java:93)
at org.hibernate.sql.exec.spi.JdbcSelectExecutor.list(JdbcSelectExecutor.java:31)
at org.hibernate.loader.ast.internal.SingleIdLoadPlan.load(SingleIdLoadPlan.java:145)
at org.hibernate.loader.ast.internal.SingleIdLoadPlan.load(SingleIdLoadPlan.java:117)
at org.hibernate.loader.ast.internal.SingleIdEntityLoaderStandardImpl.load(SingleIdEntityLoaderStandardImpl.java:72)
at org.hibernate.persister.entity.AbstractEntityPersister.doLoad(AbstractEntityPersister.java:3381)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3371)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:602)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromCacheOrDatasource(DefaultLoadEventListener.java:588)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:557)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:550)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:202)
at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:101)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:78)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:138)
at org.hibernate.internal.SessionImpl.fireLoadNoChecks(SessionImpl.java:1231)
at org.hibernate.internal.SessionImpl.immediateLoad(SessionImpl.java:1043)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:173)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:310)