org hibernate MappingException Unknown entity

Question

I m trying to work through Beginning Hibernate 2nd edition  and I m stuck trying to put together the simple working example with HSQLDB   When I run ant populateMessages  I get   java  org hibernate MappingException  Unknown entity  sample entity Message  java      at org apache tools ant taskdefs ExecuteJava execute ExecuteJava java 194   java      at org apache tools ant taskdefs Java run Java java 747        Here s what I ve got   Message java  package sample entity   import org hibernate annotations Entity   import javax persistence GeneratedValue  import javax persistence Id  import javax persistence Table    Entity public class Message       private String messageText      private Integer id       public Message  String messageText                 this messageText   messageText             public Message                    public String getMessageText                 return messageText             public void setMessageText String messageText                this messageText   messageText              Id      GeneratedValue     public Integer getId                 return id             public void setId Integer id                this id   id            PopulateMessages java  package sample   import org hibernate Session  import org hibernate SessionFactory  import org hibernate cfg AnnotationConfiguration  import org hibernate cfg Configuration  import sample entity Message   import java util Date   public class PopulateMessages       public static void main String   args                SessionFactory factory   new AnnotationConfiguration   configure   buildSessionFactory            Session session   factory openSession            session beginTransaction             Message m1   new Message  Hibernated a  messages on     new Date             session save m1           session getTransaction   commit            session close              build properties    Path to the hibernate install directory hibernate home C  hibernate hibernate-3 5 6   Path to the hibernate-tools install directory hibernate tools home C  hibernate hibernate-tools   Path to hibernate-tools jar relative to hibernate tools home hibernate tools path  plugins org hibernate eclipse 3 3 1 v201006011046R-H111-GA lib tools   Path to hibernate-tools hibernate libraries relative to hibernate tools home hibernate tools lib path  plugins org hibernate eclipse 3 3 1 v201006011046R-H111-GA lib hibernate   Path to the SLF4J implementation JAR for the logging framework to use slf4j implementation jar lib slf4j-simple-1 6 1 jar   Path to the HSQL DB install directory hsql home C  hsqldb   hibernate cfg xml   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  hibernate connection url  gt  jdbc hsqldb file testdb shutdown true  lt  property gt   lt property name  hibernate connection driver class  gt  org hsqldb jdbcDriver  lt  property gt   lt property name  hibernate connection username  gt sa lt  property gt   lt property name  hibernate connection password  gt  lt  property gt   lt property name  hibernate connection pool size  gt 0 lt  property gt   lt property name  hibernate dialect  gt  org hibernate dialect HSQLDialect  lt  property gt   lt property name  hibernate show sql  gt false lt  property gt   lt  --  Import  the mapping resources here -- gt   lt mapping class  sample entity Message   gt   lt  session-factory gt   lt  hibernate-configuration gt    build xml   lt project name  sample  gt       lt property file  build properties   gt       lt property name  src  location  src   gt       lt property name  bin  location  bin   gt       lt property name  sql  location  sql   gt       lt property name  hibernate tools                value    hibernate tools home   hibernate tools path    gt       lt path id  classpath base  gt           lt pathelement location    src    gt           lt pathelement location    bin    gt           lt pathelement location    hibernate home  hibernate3 jar   gt           lt pathelement location    slf4j implementation jar    gt           lt fileset dir    hibernate home  lib  includes       jar   gt           lt pathelement location    hsql home  lib hsqldb jar   gt     lt fileset dir    lib  includes       jar   gt       lt  path gt   lt path id  classpath tools  gt       lt path refid  classpath base   gt       lt pathelement             location    hibernate tools home    hibernate tools lib path  commons-logging-1 0 4 jar   gt       lt pathelement             location    hibernate tools  freemarker jar   gt       lt pathelement             location    hibernate tools  hibernate-tools jar   gt   lt  path gt   lt taskdef name  htools           classname  org hibernate tool ant HibernateToolTask           classpathref  classpath tools   gt   lt target name  exportDDL  depends  compile  gt       lt mkdir dir    sql    gt       lt htools destdir    sql   gt           lt classpath refid  classpath tools   gt           lt annotationconfiguration                 configurationfile    src  hibernate cfg xml   gt           lt hbm2ddl drop  true  outputfilename  sample sql   gt       lt  htools gt   lt  target gt   lt target name  compile  gt       lt javac srcdir    src   destdir    bin   classpathref  classpath base   gt   lt  target gt   lt target name  populateMessages  depends  compile  gt       lt java classname  sample PopulateMessages  classpathref  classpath base   gt   lt  target gt   lt target name  listMessages  depends  compile  gt       lt java classname  sample ListMessages  classpathref  classpath base   gt   lt  target gt

User · Answer

Use below line of code in the case of Spring Boot Application  Add in Spring Boot Main Class  EntityScan basePackageClasses YourClassName class

User · Answer

I encountered the same problem when I switched to AnnotationSessionFactoryBean  I was using entity hbm xml before   I found that My class was missing following annotation which resolved the issue in my case    Entity  Table name    MyTestEntity    XmlRootElement

User · Answer

Use import javax persistence Entity  Instead of import org hibernate annotations Entity

User · Answer

use below line of code in the case of spring boot applications     EntityScan basePackageClasses YourClassName class

User · Answer

check that entity is defined in hibernate cfg xml or not

User · Answer

You can enable entity scan by adding below annotation on Application  java  EntityScan basePackageClasses YourEntityClassName class   Or you can set the packageToScan in your session factory  sessionFactory setPackagesToScan    com all entity

User · Answer

My issue was resolved After adding sessionFactory setPackagesToScan  new String      com springhibernate model      Tested this Functionality in spring boot latest version 2 1 2   Full Method     Bean  name  sessionFactoryConfig       public LocalSessionFactoryBean sessionFactoryConfig              LocalSessionFactoryBean sessionFactory   new LocalSessionFactoryBean             sessionFactory setDataSource dataSourceConfig             sessionFactory setPackagesToScan                  new String      com springhibernate model               sessionFactory setHibernateProperties hibernatePropertiesConfig              return sessionFactory

User · Answer

In case if you get this exception in SpringBoot application even though the entities are annotated with Entity annotation  it might be due to the spring not aware of where to scan for entities  To explicitly specify the package  add below   SpringBootApplication  EntityScan   model package name    public class SpringBootApp         note  If you model classes resides in the same or sub packages of SpringBootApplication annotated class  no need to explicitly declare the EntityScan  by default it will scan

User · Answer

you should add all the entity files in the  addAnnotatedClass Class  method  if the class needs to be auto discovered   use this link  it might help    http   docs jboss org hibernate stable core api org hibernate cfg AnnotationConfiguration html

User · Answer

You entity is not correctly annotated  you must use the  javax persistence Entity annotation  You can use the Hibernate extension  org hibernate annotations Entity to go beyond what JPA has to offer but the Hibernate annotation is not a replacement  it s a complement   So change your code into   import javax persistence Entity  import javax persistence GeneratedValue  import javax persistence Id  import javax persistence Table    Entity public class Message                 References   Hibernate Annotations Reference Guide   2 4  Hibernate Annotation Extensions

User · Answer

You should call  addAnnotatedClass Message class  on your AnnotationConfiguration   If you want your entities to be auto-discovered  use EntityManager  JPA    Reference   Update  it appears you have listed the class in hibernate cfg xml  So auto-discovery is not necessary  Btw  try javax persistence Entity

User · Answer

In hibernate cfg xml   please put following code    lt mapping class  class bo name   gt

[java] org.hibernate.MappingException: Unknown entity

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