是什么导致了这个org.hibernate.mappingexception?

我正在尝试配置一个ejb3示例应用程序,它是映射到postgres的实体,现在我希望应用程序使用jpa在jboss4.3和informix上运行。

如果创建ddl <property name="hibernate.hbm2ddl.auto" value="create"/> 激活此错误出现

> WARN  [ServiceController] Problem
> starting service
> persistence.units:ear=weblog.ear,jar=weblog.jar,unitName=weblog
> javax.persistence.PersistenceException:
> [PersistenceUnit: weblog] Unable to
> build EntityManagerFactory
>         at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)
>         at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132)
>         at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)

然后

Caused by: org.hibernate.MappingException: No Dialect mapping for JDBC type: 2005
            at org.hibernate.dialect.TypeNames.get(TypeNames.java:56)
            at org.hibernate.dialect.TypeNames.get(TypeNames.java:81)
            at org.hibernate.dialect.Dialect.getTypeName(Dialect.java:291)
            at org.hibernate.mapping.Column.getSqlType(Column.java:182)
            at org.hibernate.mapping.Table.sqlCreateString(Table.java:394)
            at org.hibernate.cfg.Configuration.generateSchemaCreationScript(Configuration.java:854)
            at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:74)
            at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:311)
            at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300)
            at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:874)
            at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)

jdbc type:2005是什么意思? 知道我如何追踪导致问题的实体/列吗?

谢谢