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hamids
 Post subject: Cannot Instantiate Id Generator?
PostPosted: Mon Feb 07, 2005 1:25 pm 
Regular
Regular

Joined: Tue Jan 11, 2005 8:55 pm
Posts: 53
Hi -

I am using Hibernate 2.1.7 and Oracle 9 DB, and I have been stuck on this issue for a quite a while - *any* help would be appreciated! I've tried multiple ways to fix this problem, but so far no luck.

I am trying to use the sequence generator class, however, I continue to get the following error when I use the SchemaExport tool:


Code:
     [java] Feb 7, 2005 8:58:26 AM net.sf.hibernate.tool.hbm2ddl.SchemaExport main
     [java] SEVERE: Error creating schema
     [java] net.sf.hibernate.MappingException: could not instantiate id generator
     [java] at net.sf.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:82)
     [java] at net.sf.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:82)
     [java] at net.sf.hibernate.cfg.Configuration.iterateGenerators(Configuration.java:434)
     [java] at net.sf.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:493)
     [java] at net.sf.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:58)
     [java] at net.sf.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:48)
     [java] at net.sf.hibernate.tool.hbm2ddl.SchemaExport.main(SchemaExport.java:303)
     [java] Caused by: java.lang.ClassNotFoundException:
     [java] at java.lang.Class.forName0(Native Method)
     [java] at java.lang.Class.forName(Unknown Source)
     [java] at net.sf.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:102)
     [java] at net.sf.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:76)
     [java] ... 6 more


Here are my set of xDoclet tags for my java class:

Code:
   /**
    * @hibernate.id name="id" column="ADDRESS_ID"
    *                type="long"
    *                generator-class="native"
    * @hibernate.generator-param name="sequence" value="my_seq"
    * @return Returns the addressId.
    */
   public long getAddressId() {
      return addressId;
   }


And here is my Hibernate Properties file:

Code:
hibernate.dialect net.sf.hibernate.dialect.Oracle9Dialect
hibernate.connection.driver_class oracle.jdbc.driver.OracleDriver
hibernate.connection.username user
hibernate.connection.password pwd
hibernate.connection.url jdbc:oracle:thin:@xxxxx

Code:

It was working fine when I was using generator-class="uuid.string", and now when I switched to "sequence", I run into these errors... (I also get these errors when I use generator-class='native')

please help!
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michael
 Post subject:
PostPosted: Mon Feb 07, 2005 1:35 pm 
Hibernate Team
Hibernate Team

Joined: Tue Sep 09, 2003 2:10 pm
Posts: 3246
Location: Passau, Germany
check the generated hbm
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hamids
 Post subject:
PostPosted: Mon Feb 07, 2005 1:44 pm 
Regular
Regular

Joined: Tue Jan 11, 2005 8:55 pm
Posts: 53
michael wrote:
check the generated hbm


I have checked the generated hbm and nothing odd stands out..?

Here it is:
Code:
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping
>
    <class
        name="Address"
        table="ADDRESS"
        dynamic-update="false"
        dynamic-insert="false"
        select-before-update="false"
        optimistic-lock="version"
    >

        <id
            name="addressId"
            column="ADDRESS_ID"
            type="long"
        >
            <generator class="sequence">
                <param name="sequence">my_seq</param>
              <!-- 
                  To add non XDoclet generator parameters, create a file named
                  hibernate-generator-params-Address.xml
                  containing the additional parameters and place it in your merge dir.
              -->
            </generator>
        </id>

        <property
            name="streetAddressLine1"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="ADDRESS_LINE_1"
            length="500"
            not-null="true"
        />

        <property
            name="streetAddressLine2"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="ADDRESS_LINE_2"
            length="500"
        />

        <property
            name="city"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="CITY"
            length="250"
            not-null="true"
        />

        <property
            name="countryCode"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="COUNTRY"
            length="50"
            not-null="true"
        />

        <property
            name="stateCode"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="STATE"
            length="50"
            not-null="true"
        />

        <property
            name="status"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="STATUS"
            length="500"
            not-null="true"
        />

   
        <property
            name="postalCode"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="ZIP_CODE"
            length="50"
            not-null="true"
        />

        <!--
            To add non XDoclet property mappings, create a file named
                hibernate-properties-Address.xml
            containing the additional properties and place it in your merge dir.
        -->

    </class>

</hibernate-mapping>
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hamids
 Post subject:
PostPosted: Mon Feb 07, 2005 3:46 pm 
Regular
Regular

Joined: Tue Jan 11, 2005 8:55 pm
Posts: 53
To further add on, I get the error I mentioned above after the following statements "processing foreign key constraints" ( I forgot to paste that part too). See below:

Code:
     [java] 11:27:52,090  INFO Configuration: processing one-to-one association property references
     [java] 11:27:52,090  INFO Configuration: processing foreign key constraints
     [java] net.sf.hibernate.MappingException: could not instantiate id generator
     [java] at net.sf.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:82)
     [java] at net.sf.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:82)
     [java] at net.sf.hibernate.cfg.Configuration.iterateGenerators(Configuration.java:434)
     [java] at net.sf.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:493)
     [java] at net.sf.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:58)
     [java] at net.sf.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:48)
     [java] at net.sf.hibernate.tool.hbm2ddl.SchemaExport.main(SchemaExport.java:303)
     [java] Caused by: java.lang.ClassNotFoundException:
     [java] at java.lang.Class.forName0(Native Method)
     [java] at java.lang.Class.forName(Unknown Source)
     [java] at net.sf.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:102)
     [java] at net.sf.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:76)


Can anyone give more info so I can troubleshoot the problem?
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hamids
 Post subject: Re: Cannot Instantiate Id Generator?
PostPosted: Tue Feb 08, 2005 3:23 pm 
Regular
Regular

Joined: Tue Jan 11, 2005 8:55 pm
Posts: 53
FYI, I resolved this issue. I was using xDoclet tags for my java classes. Here were my original tags:

Code:
   /**
    * @hibernate.id name="id" column="ADDRESS_ID"
    *                type="long"
    *                generator-class="sequence"
    * @hibernate.generator-param name="sequence" value="my_seq"
    * @return Returns the addressId.
    */
   public long getAddressId() {
      return addressId;
   }


And when I removed the type='long' attribute and let SchemaExport specify the type, it worked perfectly fine:

Code:
   /**
    * @hibernate.id name="id" column="ADDRESS_ID"
    *                generator-class="sequence"
    * @hibernate.generator-param name="sequence" value="my_seq"
    * @return Returns the addressId.
    */
   public long getAddressId() {
      return addressId;
   }


I'm not sure why it won't work when I explicity state the type. At least it's resolved though! :)
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