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I am trying to use hibernate 4.3.0.Beta5 and slf4j (logback backend) in a simple project. It is failing with this stack trace:
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.hibernate.loader.plan2.build.spi.AbstractLoadPlanBuildingAssociationVisitationStrategy$MDCStack
at org.hibernate.loader.plan2.build.spi.AbstractLoadPlanBuildingAssociationVisitationStrategy.mdcStack(AbstractLoadPlanBuildingAssociationVisitationStrategy.java:119) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.plan2.build.spi.AbstractLoadPlanBuildingAssociationVisitationStrategy.pushToStack(AbstractLoadPlanBuildingAssociationVisitationStrategy.java:114) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.plan2.build.spi.AbstractLoadPlanBuildingAssociationVisitationStrategy.startingEntity(AbstractLoadPlanBuildingAssociationVisitationStrategy.java:190) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.persister.walking.spi.MetamodelGraphWalker.visitEntityDefinition(MetamodelGraphWalker.java:108) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.persister.walking.spi.MetamodelGraphWalker.visitEntity(MetamodelGraphWalker.java:71) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.plan2.build.spi.MetamodelDrivenLoadPlanBuilder.buildRootEntityLoadPlan(MetamodelDrivenLoadPlanBuilder.java:53) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.<init>(AbstractLoadPlanBasedEntityLoader.java:80) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.plan.EntityLoader.<init>(EntityLoader.java:135) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.plan.EntityLoader.<init>(EntityLoader.java:56) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.plan.EntityLoader$Builder.byUniqueKey(EntityLoader.java:99) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.plan.EntityLoader$Builder.byPrimaryKey(EntityLoader.java:95) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.plan.AbstractBatchingEntityLoaderBuilder.buildNonBatchingLoader(AbstractBatchingEntityLoaderBuilder.java:47) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.loader.entity.BatchingEntityLoaderBuilder.buildLoader(BatchingEntityLoaderBuilder.java:76) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:2501) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:2523) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.persister.entity.AbstractEntityPersister.createLoaders(AbstractEntityPersister.java:3888) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.persister.entity.AbstractEntityPersister.postInstantiate(AbstractEntityPersister.java:3870) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:477) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1853) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:854) ~[hibernate-entitymanager-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:847) ~[hibernate-entitymanager-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:396) ~[hibernate-core-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:846) ~[hibernate-entitymanager-4.3.0.Beta5.jar:4.3.0.Beta5]
at org.hibernate.jpa.HibernatePersistenceProvider.createContainerEntityManagerFactory(HibernatePersistenceProvider.java:146) ~[hibernate-entitymanager-4.3.0.Beta5.jar:4.3.0.Beta5]
This is because in org.jboss.logging.Slf4jLoggerProvider.putMdc(String, Object) the MDCStack is converted to a String so when it is read back in org.hibernate.loader.plan2.build.spi.AbstractLoadPlanBuildingAssociationVisitationStrategy.mdcStack() it won't be an MDCStack anymore.
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Critical
