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

Environment

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

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)
      ...
  

Resolution

This issue¹ is resolved in This content is not included.EAP 7.1 cumulative patch (CP) 6 and later releases. Production systems should use the latest available cumulative patch.

Root Cause

This is a known defect (Content from hibernate.atlassian.net is not included.HHH-12935).

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