"SchemaManagementException: SQL strings added more than once" in Hibernate

Solution In Progress - Updated -

Issue

  • Two different entities in a single persistence unit are mapped to tables by the same name which reside in different database schemas
  • The tables each have unique constraints on identically named, non-primary key properties

    @Entity
    @Table(name = "employee", schema = "testone")
    public class EmployeeOne {
            @Id
            private String name;
    
            @Column(unique = true)
            private String title;
            ...
    }
    
    @Entity
    @Table(name = "employee", schema = "testtwo")
    public class EmployeeTwo {
            @Id
            private String name;
    
            @Column(unique = true)
            private String title;
            ...
    }
    
  • When Hibernate is used to generate the database artifacts, (e.g. hibernate.hbm2ddl.auto=create-drop), an exception is raised

    ... org.hibernate.tool.schema.spi.SchemaManagementException: SQL strings added more than once for: employee.UK-UK_....
        at org.hibernate.tool.schema.internal.SchemaCreatorImpl.checkExportIdentifier(SchemaCreatorImpl.java:408)
        at org.hibernate.tool.schema.internal.SchemaCreatorImpl.createFromMetadata(SchemaCreatorImpl.java:347)
        at org.hibernate.tool.schema.internal.SchemaCreatorImpl.performCreation(SchemaCreatorImpl.java:165)
        at org.hibernate.tool.schema.internal.SchemaCreatorImpl.doCreation(SchemaCreatorImpl.java:134)
        at org.hibernate.tool.schema.internal.SchemaCreatorImpl.doCreation(SchemaCreatorImpl.java:120)
        at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:148)
        at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:65)
        at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:478)
        at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:423)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:880)
        ...
    

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP) 7
  • Hibernate 5

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