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Hibernate Hello World Program With Annotations

Hibernate » On Aug 30, 2011 { 10 Comments } By Sivateja

Folks we will see one simple program with hibernate annotations, let us take inserting a record [ saving one object ] into the database application.  And remember in the annotations no need to write mapping xml, hope you remember the previous sessions :-)

Files required..

  • Product.java [ our pojo class ]
  • ClientForSave.java
  • hibernate.cfg.xml

Product.java

ClientForSave.java

hibernate.cfg.xml

And friends,  no need to explain there i think.  Please refer previous introduction sessions on annotations in case  you have any doubt.

Output

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Comments

10 Responses to “Hibernate Hello World Program With Annotations”
  1. Mohammed Vaseem says:

    Hello Java4s,
    Am getting exception in this program.
    Showing exception as
    Exception in thread “main” org.hibernate.MappingException: Unknown entity: str.Product

    Please help!

  2. Mohammed Vaseem says:

    I got solution for the exception which i was facing.

    Exception in thread “main” org.hibernate.MappingException: Unknown entity: str.Product

    If we add the two lines in the hibernate.cfg file then i did not got that exception again and the program got executed successfully..

  3. Java4s says:

    @Vaseem

    Hmm… str.Product !
    Vaseem what are those 2 lines you added into hibernate.cfg ?

  4. Mohammed Vaseem says:

    The program can get executed even with one line..
    that line is..

    When we are not using hbm.xml file(mapping file), then we have to give fully qualified name of the annotated class to the mapping element.

  5. Ambresh Sharna says:

    i need some more emphasis on NamedQuery theory and Example like as development mode i can use that..if you can do… would b better for me…Thanks Java4s

  6. Aalam says:

    In the hibernate.cfg.xml file there is no mapping for pojo class…we need to map the pojo class as we are not using hbm.xml

  7. Java4s says:

    @Aalam

    Yeah in the 18th line, we must specify the mapping class name you are correct, that should be class=”str.Product”. Corrected..!!

    Thanks Aalam :-)

  8. stephen says:

    Db table name : student_table
    Table name mentioned as @Table(name = “student_talbe”)

    table name mentioned in are differnt. How will this program work ? :(

  9. To stephen: Hi Stephen,Hibernate will create table automatically as per given query in “update” in hibernate.cfg.xml file.Here you can also use “create” instead of update.

  10. Govardhan MK says:

    Sir as you said we use annaotations to avoid using mapping xml i.e instead of using mapping xml we r using annotations.

    My question is in your herbernate.cfg.xml file Why you are again using
    ?????

    please answer me!!!!!!

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