Hibernate - id tag

Posted on 2007-10-09
Last Modified: 2013-11-24

I have the following error on my mapping file :
net.sf.hibernate.util.XMLHelper - Error parsing XML: XML InputStream(12) Le contenu du type d'élément "id" est incomplet et doit correspondre à "(meta*,column*,generator)".
(translated => content of element id is not complete : it must match "(meta*,column*,generator)".)
[09/10/07 16:17:07:224 CEST] 66ea4102 SystemErr     R Exception : Error reading resource: mapping-files/Bank.hbm.xml
[09/10/07 16:17:07:224 CEST] 66ea4102 SystemErr     R java.lang.NullPointerException

The problem is that this file, the tag "id" doesn't have a "generator" element (which i read in the doc, is optional) :
            <id name="keyBic" type="string" column="KEY_BIC">
                  <!--<generator class="increment"></generator>-->
If I uncomment I have everything working.

The dtd is the following :

What should I do ?

Question by:matthew016
    LVL 35

    Expert Comment

    I don't believe it is optional...  Where did you read that it was?
    LVL 9

    Author Comment

    by:matthew016 Generator
    The optional <generator> child element names a Java class used to generate unique identifiers for instances of the persistent class. If any parameters are required to configure or initialize the generator instance, they are passed using the <param> element.

    <id name="id" type="long" column="cat_id">
            <generator class="">
                    <param name="table">uid_table</param>
                    <param name="column">next_hi_value_column</param>
    All generators implement the interface This is a very simple interface; some applications may choose to provide their own specialized implementations. However, Hibernate provides a range of built-in implementations. There are shortcut names for the built-in generators:

    generates identifiers of type long, short or int that are unique only when no other process is inserting data into the same table. Do not use in a cluster.

    supports identity columns in DB2, MySQL, MS SQL Server, Sybase and HypersonicSQL. The returned identifier is of type long, short or int.

    uses a sequence in DB2, PostgreSQL, Oracle, SAP DB, McKoi or a generator in Interbase. The returned identifier is of type long, short or int

    uses a hi/lo algorithm to efficiently generate identifiers of type long, short or int, given a table and column (by default hibernate_unique_key and next_hi respectively) as a source of hi values. The hi/lo algorithm generates identifiers that are unique only for a particular database.

    uses a hi/lo algorithm to efficiently generate identifiers of type long, short or int, given a named database sequence.

    uses a 128-bit UUID algorithm to generate identifiers of type string, unique within a network (the IP address is used). The UUID is encoded as a string of hexadecimal digits of length 32.

    uses a database-generated GUID string on MS SQL Server and MySQL.

    picks identity, sequence or hilo depending upon the capabilities of the underlying database.

    lets the application to assign an identifier to the object before save() is called. This is the default strategy if no <generator> element is specified.

    retrieves a primary key assigned by a database trigger by selecting the row by some unique key and retrieving the primary key value.

    uses the identifier of another associated object. Usually used in conjunction with a <one-to-one> primary key association.

    a specialized sequence generation strategy which utilizes a database sequence for the actual value generation, but combines this with JDBC3 getGeneratedKeys to actually return the generated identifier value as part of the insert statement execution. This strategy is only known to be supported on Oracle 10g drivers targetted for JDK 1.4. Note comments on these insert statements are disabled due to a bug in the Oracle drivers.

    LVL 35

    Accepted Solution

    That's Hibernate 3 isn't it?  But the DTD was for Hibernate 2

    I may be getting my wires crossed though...
    LVL 35

    Expert Comment

    LVL 9

    Author Comment

    Unfortunately I have the version 2
    LVL 9

    Author Comment

    I have set the generator as "assigned". this is what I need. Thank you.
    LVL 35

    Expert Comment

    Cool :-)  Good luck with it :-)


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