org hibernate MappingException Unknown entity annotations Users

Question

Consider the hierarchy       And the following classes and xml     HibernateUtil java  package annotations   import org hibernate SessionFactory  import org hibernate cfg Configuration  import org hibernate service ServiceRegistry  import org hibernate service ServiceRegistryBuilder                author X3        public class HibernateUtil        private static final SessionFactory sessionFactory   buildSessionFactory        private static final String HIBERNATE CFG    hibernateAnnotations cfg xml        private static SessionFactory buildSessionFactory                  Configuration cfg   new Configuration   addResource HIBERNATE CFG  configure            ServiceRegistry serviceRegistry   new ServiceRegistryBuilder                    applySettings cfg getProperties    buildServiceRegistry            SessionFactory sessionFactory   cfg buildSessionFactory serviceRegistry           return sessionFactory             public static SessionFactory getSessionFactory             return sessionFactory            Users java  package annotations   import javax persistence Column  import javax persistence Entity  import javax persistence GeneratedValue  import javax persistence Id  import javax persistence Table  import java sql Timestamp    Entity  Table name    Users   public class Users         Id      GeneratedValue      Column name    USER ID       private long userID        Column name    USERNAME   nullable   false  length   100      private String username        Column name    MessageTimeDate   nullable   false      private java sql Timestamp datetime        Column name    UserMessage   nullable   false      private String message         public Users String username   String message                java util Date date   new java util Date            this datetime   new Timestamp date getTime              this username   username          this message   message             public long getUserID             return userID             public void setUserID long userID            this userID   userID             public String getUsername             return username             public void setUsername String username            this username   username             public java sql Timestamp getDatetime             return datetime             public void setDatetime java sql Timestamp datetime            this datetime   datetime             public String getMessage             return message             public void setMessage String message            this message   message             Main java   package annotations   import org hibernate Session  import org hibernate SessionFactory   public class Main        public static void main String   args             try                          SessionFactory sf   HibernateUtil getSessionFactory                   Session session   sf openSession                   session beginTransaction                    Users user1   new Users  Jack     Hello                   session save user1                  session getTransaction   commit                   session close                       catch  Exception e                        System out println e toString                 e getStackTrace                          And hibernateAnnotations cfg xml   lt  xml version  1 0  encoding  utf-8   gt   lt  DOCTYPE hibernate-configuration PUBLIC          -  Hibernate Hibernate Configuration DTD 3 0  EN           http   hibernate sourceforge net hibernate-configuration-3 0 dtd  gt   lt hibernate-configuration gt       lt session-factory gt           lt property name  connection driver class  gt com mysql jdbc Driver lt  property gt           lt property name  connection url  gt jdbc mysql   localhost 3306 CHAT DB lt  property gt           lt property name  connection username  gt root lt  property gt           lt property name  connection password  gt root lt  property gt           lt property name  connection pool size  gt 1 lt  property gt           lt property name  dialect  gt org hibernate dialect MySQLDialect lt  property gt           lt property name  current session context class  gt thread lt  property gt           lt property name  cache provider class  gt org hibernate cache NoCacheProvider lt  property gt           lt property name  show sql  gt true lt  property gt           lt property name  hbm2ddl auto  gt create lt  property gt           lt mapping class  annotations Users  gt  lt  mapping gt              lt  session-factory gt   lt  hibernate-configuration gt    When I run main    the following error appears in output window     org hibernate MappingException  Unknown entity  annotations Users   But the entity Users is in annotations package   so what s wrong

User · Answer

In my case it resolves by adding configuration addAnnotatedClass com myApp model Example class   after Configuration configuration   new Configuration   configure HibernateUtil class getResource   hibernate cfg xml     in hibernateUtill class   It Read a mapping from the class annotation metadata   Read more about addAnnotatedClass   from here

User · Answer

The Hibernate configuration file must define the entity classes    lt mapping class  annotations Users   gt    Or you must explicitly add the class to the configuration using  configuration addClass annotations Users class     Read mappings as a application resourceName     addResource is for add hbml xml files in case of declarative approach configuration addResource  myFile hbm xml        not hibernateAnnotations cfg xml

User · Answer

Problem occurs because of the entry mapping class  annotations Users  in hibernate cfg xml remove that line then it will be work   I had the same issue  When I removed the above line then it was working fine for me

User · Answer

If you are using 5 0x version configuration with standard service registry is deprecated   Instead you should bootstrap it with Metadata  In your HibernateUtil class  you should add  private static SessionFactory buildSessionFactory         try                      StandardServiceRegistry standardRegistry   new StandardServiceRegistryBuilder                configure   hibernate cfg xml                 build             Metadata metadata   new MetadataSources  standardRegistry                getMetadataBuilder                build             return metadata getSessionFactoryBuilder   build          catch

User · Answer

I was facing the same issue and I searched for almost 2 hours and tried with different possible ways like replacing old hibernate JARs and changing the DB table schema  But finally got the solution as below   SessionFactory factory   new Configuration   configure   buildSessionFactory      This line to be replaced with below commented line   Replace above for    Configuration config   new Configuration   configure      ServiceRegistry servReg   new StandardServiceRegistryBuilder   applySettings config getProperties    build      SessionFactory factory   config buildSessionFactory servReg     It will then work fine

User · Answer

Check the package name is given in the property packagesToScan in the dispatcher-servlet xml      lt bean id  sessionFactory              class  org springframework orm hibernate3 annotation AnnotationSessionFactoryBean  gt             lt property name  dataSource  ref  dataSource    gt             lt property name  packagesToScan  value    entity package name here    gt  lt  property gt            lt property name  hibernateProperties  gt                 lt props gt                     lt prop key  hibernate dialect  gt   hibernate dialect  lt  prop gt                     lt prop key  hibernate show sql  gt   hibernate show sql  lt  prop gt                 lt  props gt             lt  property gt         lt  bean gt

User · Answer

If your entity is mapped through annotations  add the following code to your configuration   configuration addAnnotatedClass theEntityPackage EntityClassName class     For example   configuration addAnnotatedClass com foo foo1 Products class     if your entity is mapped with xml file  use addClass instead of addAnnotatedClass   As an example   configuration addClass com foo foo1 Products class     Ping me if you need more help

User · Answer

Instead of using HibernateUtil java  to create sessionfactory object  you should use this   SessionFactory sessionFactory new AnnotationConfiguration   configure   buildSessionFactory      Because in order to avoid the exception  you ll have to declare the class object in HibernateUtil java file as configuration addAnnotatedClass Student Info class   which looks dumb because we have provided the entry already in hibernate cfg xml file   To use the AnnotationConfiguration class you ll have to add a jar to your project build path  http   www java2s com Code Jar h Downloadhibernate353jar htm

User · Answer

For those using Spring s Java configuration classes  you might write the following    Autowired  Bean name    sessionFactory   public SessionFactory getSessionFactory DataSource dataSource        LocalSessionFactoryBuilder sessionBuilder   new LocalSessionFactoryBuilder dataSource       sessionBuilder addProperties getHibernateProperties         sessionBuilder addAnnotatedClasses Foo class       sessionBuilder addAnnotatedClasses Bar class       sessionBuilder addAnnotatedClasses Bat class       return sessionBuilder buildSessionFactory

User · Answer

I was having similar issue and adding    sessionFactory setAnnotatedClasses User class     this line helped but before that I was having   sessionFactory setPackagesToScan new String      com rg spring model        I am not sure why that one is not working User class is under com rg spring model Please let me know how to get it working via packagesToScan method

User · Answer

Add the following code to hibernate cfg xml     lt property name  hibernate c3p0 min size  gt 5 lt  property gt     lt property name  hibernate c3p0 max size  gt 20 lt  property gt     lt property name  hibernate c3p0 timeout  gt 300 lt  property gt     lt property name  hibernate c3p0 max statements  gt 50 lt  property gt     lt property name  hibernate c3p0 idle test period  gt 3000 lt  property gt

User · Answer

Add the following to your xml    lt bean id  sessionFactory      class  org springframework orm hibernate4 LocalSessionFactoryBean  gt       lt property name  dataSource  ref  dataSource    gt       lt property name  packagesToScan  gt           lt list gt               lt value gt annotations lt  value gt           lt  list gt       lt  property gt       lt property name  hibernateProperties  gt           lt props gt               lt prop key  hibernate dialect  gt org hibernate dialect MySQLDialect lt  prop gt               lt prop key  hibernate show sql  gt true lt  prop gt           lt  props gt       lt  property gt   lt  bean gt    lt tx annotation-driven transaction-manager  transactionManager    gt    lt bean id  transactionManager      class  org springframework orm hibernate4 HibernateTransactionManager  gt       lt property name  sessionFactory  ref  sessionFactory    gt   lt  bean gt

User · Answer

public static void main String   args          try             factory   new Configuration   configure   buildSessionFactory             factory   new AnnotationConfiguration                       configure                         addPackage  com xyz     add package if used                     addAnnotatedClass Employee class                      buildSessionFactory           catch  Throwable ex              System err println  Failed to create sessionFactory object     ex            throw new ExceptionInInitializerError ex             you can write like this in your test class inside main method this way you will be able to do the things using annotaions only

User · Answer

Define the Entity class in Hibernate cfg xml   lt mapping class  com supernt Department   gt    While creating the sessionFactory object Load the Configuration file Like  SessionFactory factory   new AnnotationConfiguration   configure  hibernate cfg xml   buildSessionFactory

User · Answer

Initially I trying with the below code which didn t work for me  MetadataSources metadataSources   new MetadataSources serviceRegistry   Metadata metadata   metadataSources getMetadataBuilder   build    SessionFactory sessionFactory  metadata getSessionFactoryBuilder   build      For me below configuration worked  All the hibernate properties i provided from the code itself and using hibernate version 5   I m trying to connect to the Postgressql db   imports    import org hibernate Session   import org hibernate SessionFactory   import org hibernate Transaction   import org hibernate boot registry StandardServiceRegistryBuilder   import org hibernate cfg Configuration   import org hibernate cfg Environment   import org hibernate service ServiceRegistry    code       Configuration configuration   new Configuration        configuration setProperty  hibernate current session context class    thread        configuration setProperty Environment DRIVER   org postgresql Driver        configuration setProperty Environment URL  lmsParams getDbProperties   getDbURL         configuration setProperty Environment USER  lmsParams getDbProperties   getUsername         configuration setProperty Environment PASS  lmsParams getDbProperties   getPassword          configuration setProperty  hibernate connection release mode    auto        configuration setProperty  hibernate dialect    org hibernate dialect PostgreSQLDialect        configuration setProperty  hibernate show sql    true        configuration setProperty Environment HBM2DDL AUTO   create        configuration addAnnotatedClass LMSSourceTable class       ServiceRegistry serviceRegistry   new StandardServiceRegistryBuilder                applySettings configuration getProperties                 build        SessionFactory sessionFactory   configuration buildSessionFactory serviceRegistry     Latest Update  One more option worked for me using the Reflections package as a dependency  This i tried with both mysql and postgress and it works fine   Some info about Reflections  The Reflections library works as a classpath scanner  It indexes the scanned metadata and allows us to query it at runtime  It can also save this information  so we can collect and use it at any point during our project  without having to re-scan the classpath again  if you are using maven    lt dependency gt   lt groupId gt org reflections lt  groupId gt   lt artifactId gt reflections lt  artifactId gt   lt version gt 0 9 11 lt  version gt   lt  dependency gt    code    MetadataSources metadataSources   new   MetadataSources serviceRegistry    Reflections entityPackageReflections   new Reflections  com company abc package name        entityPackageReflections getTypesAnnotatedWith Entity class  forEach metadataSources  addAnnotatedClass       Metadata metadata   metadataSources getMetadataBuilder   build        SessionFactory sessionFactory   metadata getSessionFactoryBuilder   build

User · Answer

I was having same problem    Use  javax persistence Entity instead of org hibernate annotations Entity

User · Answer

When I was trying to rewrite my example  from tutorialspoint  to use annotations  I got the same exception  This helped me  addAnnotatedClass      Configuration cfg new Configuration     cfg addAnnotatedClass com tutorialspoint hibernate entity Employee class   cfg configure

User · Answer

Use EntityScanner if you can bear external dependency It will inject your all entity classes seamlessly even from multiple packages  Just add following line after configuration setup   Configuration configuration   new Configuration   configure        EntityScanner scanPackages  com fz epms db model entity   addTo configuration      And following depencency if you are using Maven  lt dependency gt           lt groupId gt com github v-ladynev lt  groupId gt           lt artifactId gt fluent-hibernate-core lt  artifactId gt           lt version gt 0 3 1 lt  version gt   lt  dependency gt    This way you don t need to declare all entities in hibernate mapping file

User · Answer

I did not find the accepted answer helpful in resolving the exception encountered in my code   And while not technically incorrect  I was also not satisfied with others  suggestions to introduce redundancy    programmatically re-add the mapped class using configuration addAnnotatedClass      create a hbm xml file and resource mapping in hibernate test cfg xml that were redundant to the existing annotations scan the package where the  already mapped  class exists using external dependencies not mentioned in the original question   However  I found 2 possible solutions that I wanted to share  both of which independently resolved the exception I encountered in my own code   I was having the same MappingException as  ron  using a very nearly identical HibernateUtil class    public final class HibernateUtil        private static SessionFactory sessionFactory   null      private static ServiceRegistry serviceRegistry   null       private HibernateUtil           public static synchronized SessionFactory getSessionFactory             if   sessionFactory    null                 Configuration configuration   new Configuration   configure  hibernate test cfg xml                serviceRegistry   new StandardServiceRegistryBuilder                        applySettings configuration getProperties                         build                sessionFactory   configuration buildSessionFactory  serviceRegistry                      return sessionFactory           exception handling and closeSessionFactory   omitted for brevity     Within my hibernate test cfg xml configuration file  I have the required class mapping    lt mapping class  myPackage Device   gt    And my Device class is properly annotated with the javax persistence Entity annotation   package myPackage core  import javax persistence      Entity  Table  name    devices    public class Device         body omitted for brevity     Two Possible Solutions   First  I am using Hibernate 5 2  and for those using Hibernate 5 this solution using a Metadata object to build a SessionFactory should work   It also appears to be the currently recommended native bootstrap mechanism in the Hibernate Getting Started Guide    public static synchronized SessionFactory getSessionFactory         if   sessionFactory    null                 exception handling omitted for brevity          serviceRegistry   new StandardServiceRegistryBuilder                    configure  hibernate test cfg xml                    build             sessionFactory   new MetadataSources  serviceRegistry                        buildMetadata                        buildSessionFactory              return sessionFactory      Second  while Configuration is semi-deprecated in Hibernate 5   ron didn t say which version of Hibernate he was using  so this solution could also be of value to some     I found a very subtle change in the order of operations when instantiating and configuring Configuration and ServiceRegistry objects to make all the difference in my own code     Original order  Configuration created and configured prior to ServiceRegistry    public static synchronized SessionFactory getSessionFactory         if   sessionFactory    null                 exception handling omitted for brevity          Configuration configuration   new Configuration   configure  hibernate test cfg xml             serviceRegistry   new StandardServiceRegistryBuilder                    applySettings  configuration getProperties                      build             sessionFactory   configuration buildSessionFactory  serviceRegistry              return sessionFactory      New order  ServiceRegistry created and configured prior to Configuration    public static synchronized SessionFactory getSessionFactory         if   sessionFactory    null                 exception handling omitted for brevity          serviceRegistry   new StandardServiceRegistryBuilder                    configure  hibernate test cfg xml                    build             sessionFactory   new Configuration   buildSessionFactory  serviceRegistry              return sessionFactory      At the risk of TLDR  I will also point out that with respect to hibernate test cfg xml my testing suggests that the configuration getProperties   method only returns  lt property   gt  elements  and  lt mapping   gt  elements are excluded   This appears consistent with the specific use of the terms  property  and  mapping  within the API documentation for Configuration   I will concede that this behaviour may have something to do with the failure of applySettings   to yield the mapping data to the StandardServiceRegistryBuilder   However  this mapping data should already have been parsed during configuration of the Configuration object and available to it when buildSessionFactory   is called   Therefore  I suspect this may be due to implementation-specific details regarding resource precedence when a ServiceRegistry is passed to a Configuration object s buildSessionFactory   method   I know this question is several years old now  but I hope this answer saves somebody the hours of research I spent in deriving it   Cheers

[java] org.hibernate.MappingException: Unknown entity: annotations.Users

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