Hibernate table not mapped error in HQL query

Question

I have a web application that use Hibernate to make CRUD operations over a database  I got an error saying that the table is not mapped  See the Java files   Error message   org springframework orm hibernate3 HibernateQueryException  Books is not mapped  SELECT COUNT    FROM Books   nested exception is org hibernate hql ast QuerySyntaxException  Books is not mapped  SELECT COUNT    FROM Books  at org springframework orm hibernate3 SessionFactoryUtils convertHibernateAccessException SessionFactoryUtils java 660  at org springframework orm hibernate3 HibernateAccessor convertHibernateAccessException HibernateAccessor java 412  at org springframework orm hibernate3 HibernateTemplate doExecute HibernateTemplate java 411      Caused by  org hibernate hql ast QuerySyntaxException  Books is not mapped  SELECT COUNT    FROM Books  at org hibernate hql ast util SessionFactoryHelper requireClassPersister SessionFactoryHelper java 181  at org hibernate hql ast tree FromElementFactory addFromElement FromElementFactory java 111  at org hibernate hql ast tree FromClause addFromElement FromClause java 93        Here s my DAO java method   public int getTotalBooks        return DataAccessUtils intResult hibernateTemplate find             SELECT COUNT    FROM Books         Book java    Entity  Table name  Books   public class Book         Id      GeneratedValue      Column name  id       private int id        Column name  title   nullable false      private String title              How should I modify it in order to work

User · Answer

Thanks everybody  Lots of good ideas  This is my first application in Spring and Hibernate   so a little more patience when dealing with  novices  like me    Please read Tom Anderson and Roman C  s answers  They explained very well the problem  And all of you helped me I replaced   SELECT COUNT    FROM Books   with  select count book id  from Book book   And of course  I have this Spring config    lt bean id  sessionFactory  class  org springframework orm hibernate3 annotation AnnotationSessionFactoryBean  gt   lt property name  packagesToScan  value  extjs model   gt    Thank you all again

User · Answer

Ensure your have set the table name on the entity annotation too    Entity name    table name    Table name    table name   public class TableName

User · Answer

hibernate3 HibernateQueryException  Books is not mapped  SELECT COUNT    FROM Books     Hibernate is trying to say that it does not know an entity named  Books    Let s look at your entity    javax persistence Entity  javax persistence Table name    Books   public class Book     Right   The table name for Book has been renamed to  Books  but the entity name is still  Book  from the class name   If you want to set the entity name  you should use the  Entity annotation s name instead      this allows you to use the entity Books in HQL queries  javax persistence Entity name    Books   public class Book     That sets both the entity name and the table name     The opposite problem happened to me when I was migrating from the Person hbm xml file to using the Java annotations to describe the hibernate fields   My old XML file had    lt hibernate-mapping package       gt       lt class name  Person  table  persons  lazy  true  gt              lt  hibernate-mapping gt    And my new entity had a  Entity name      which I needed to set the name of the table      this renames the entity and sets the table name  javax persistence Entity name    persons   public class Person             What I then was seeing was HQL errors like   QuerySyntaxException  Person is not mapped       SELECT id FROM Person WHERE id in   ids     The problem with this was that the entity name was being renamed to persons as well   I should have set the table name using      no name   here so the entity can be used as Person  javax persistence Entity    table name specified here  javax persistence Table name    persons   public class Person extends BaseGeneratedId     Hope this helps others

User · Answer

I had same problem   instead  Entity I used following code for getting records     List lt Map lt String  Object gt  gt  list   null              list   incidentHibernateTemplate execute new HibernateCallback lt List lt Map lt String  Object gt  gt  gt                    Override             public List lt Map lt String  Object gt  gt  doInHibernate Session session  throws HibernateException                   Query query   session createSQLQuery  quot SELECT   from table where appcode    app quot                        query setParameter  quot app quot   apptype                   query setResultTransformer Transformers ALIAS TO ENTITY MAP                   return query list                                        I used following code for update private  Autowired HibernateTemplate incidentHibernateTemplate  Integer updateCount   0       updateCount   incidentHibernateTemplate execute  Session session  - gt            Query lt   gt  query   session                      createSQLQuery  quot UPDATE  tablename SET key    apiurl  data mode    mode WHERE apiname   api  quot              query setParameter  quot apiurl quot   url             query setParameter  quot api quot   api             query setParameter  quot mode quot   mode               return query executeUpdate

User · Answer

This answer comes late but summarizes the concept involved in the  table not mapped  exception in order to help those who come across this problem since its very common for hibernate newbies   This error can appear due to many reasons but the target is to address the most common one that is faced by a number of novice hibernate developers to save them hours of research  I am using my own example for a simple demonstration below   The exception   org hibernate hql internal ast QuerySyntaxException  subscriber is not mapped   from subscriber    In simple words  this very usual exception only tells that the query is wrong in the below code     Session session   this sessionFactory getCurrentSession    List lt Subscriber gt  personsList   session createQuery   from subscriber   list      This is how my POJO class is declared    Entity  Table name    subscriber   public class Subscriber   But the query syntax  from subscriber  is correct and the table subscriber exists  Which brings me to a key point    It is an HQL query not SQL    and how its explained here     HQL works with persistent objects and their properties not with the database tables and columns     Since the above query is an HQL one  the subscriber is supposed to be an entity name not a table name  Since I have my table subscriber  mapped with the entity Subscriber  My problem solves if I change the code to this   Session session   this sessionFactory getCurrentSession    List lt Subscriber gt  personsList   session createQuery   from Subscriber   list      Just to keep you from getting confused  Please note that HQL is case sensitive in a number of cases  Otherwise it would have worked in my case      Keywords like SELECT   FROM and WHERE etc  are not case sensitive but   properties like table and column names are case sensitive in HQL    https   www tutorialspoint com hibernate hibernate query language htm  To further understand how hibernate mapping works  please read this

User · Answer

In addition to the accepted answer  one other check is to make sure that you have the right reference to your entity package in sessionFactory setPackagesToScan      while setting up your session factory

User · Answer

The exception message says   Books is not mapped  SELECT COUNT    FROM Books   nested exception is org hibernate hql ast QuerySyntaxException  Books is not mapped  SELECT COUNT    FROM Books   Books is not mapped  That is  that there is no mapped type called Books  And indeed  there isn t  Your mapped type is called Book  It s mapped to a table called Books  but the type is called Book  When you write HQL  or JPQL  queries  you use the names of the types  not the tables  So  change your query to   select count    from Book  Although I think it may need to be  select count b  from Book b  If HQL doesn t support the   notation

User · Answer

In the Spring configuration typo applicationContext xml where the sessionFactory configured put this property   lt bean id  sessionFactory  class  org springframework orm hibernate3 annotation AnnotationSessionFactoryBean  gt     lt property name  packagesToScan  value    package name    gt

User · Answer

Hibernate also is picky about the capitalization  By default it s going to be the class name with the First letter Capitalized  So if your class is called FooBar  don t pass  foobar   You have to pass  FooBar  with that exact capitalization for it to work

[java] Hibernate table not mapped error in HQL query

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