When I run this code, ..... int id = 20; //Id is the primary key in the db table Query query = em.createNativeQuery("select p.* from Person where p.id = " + id); log.debug(query.getResultList()); ....... I get the following exception: Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.MappingException: No Dialect mapping for JDBC type: -1 Caused by: org.hibernate.MappingException: No Dialect mapping for JDBC type: -1 at org.hibernate.dialect.TypeNames.get(TypeNames.java:56) at org.hibernate.dialect.TypeNames.get(TypeNames.java:81) at org.hibernate.dialect.Dialect.getHibernateTypeName(Dialect.java:217) at org.hibernate.loader.custom.CustomLoader.getHibernateType(CustomLoader.java:176) at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:146) at org.hibernate.loader.Loader.getResultSet(Loader.java:1678) at org.hibernate.loader.Loader.doQuery(Loader.java:662) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224) at org.hibernate.loader.Loader.doList(Loader.java:2145) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029) at org.hibernate.loader.Loader.list(Loader.java:2024) at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:118) at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1684) at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142) at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:164) at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:53) ... 5 more Any help will be appreciated. Thanks K View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3989892#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...