java.lang.ClassCastException from hbm2java

jhillacre · **Posted:** Thu Nov 11, 2004 4:02 pm

I am getting a class cast exception running hbm2java on a simple mapping generated using middlegen. I am not sure what this exception indicates has happened. Thank you for your time.
Joel Hillacre
Hibernate version:
hibernate-2.1.6
Mapping documents:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >
    
<hibernate-mapping>
<!-- 
    Created by the Middlegen Hibernate plugin 2.1

    http://boss.bekk.no/boss/middlegen/
    http://www.hibernate.org/
-->

<class 
    name="com.tsiware.beans.Testtable" 
    table="TESTTABLE"
>
    <meta attribute="class-description" inherit="false">
       @hibernate.class
        table="TESTTABLE"
    </meta>

    <id
        name="testcolumn1"
        type="java.lang.Long"
        column="TESTCOLUMN1"
    >
        <meta attribute="field-description">
           @hibernate.id
            generator-class="assigned"
            type="java.lang.Long"
            column="TESTCOLUMN1"

        </meta>
        <generator class="assigned" />
    </id>

    <property
        name="testcolumn2"
        type="java.lang.Byte"
        column="TESTCOLUMN2"
        length="4"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="TESTCOLUMN2"
            length="4"
        </meta>    
    </property>
    <property
        name="testcolumn3"
        type="java.lang.Short"
        column="TESTCOLUMN3"
        length="6"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="TESTCOLUMN3"
            length="6"
        </meta>    
    </property>
    <property
        name="testcolumn4"
        type="java.lang.String"
        column="TESTCOLUMN4"
        length="255"
    >
        <meta attribute="field-description">
           @hibernate.property
            column="TESTCOLUMN4"
            length="255"
        </meta>    
    </property>

    <!-- Associations -->
  

</class>
</hibernate-mapping>

Full stack trace of any exception that occurs:
runhbm2java:
[hbm2java] Processing 1 files.
[hbm2java] Building hibernate objects
[hbm2java] java.lang.ClassCastException
[hbm2java] at net.sf.hibernate.tool.hbm2java.MetaAttributeHelper.mergeMetaMaps(MetaAttributeHelper.java:89)
[hbm2java] at net.sf.hibernate.tool.hbm2java.MetaAttributeHelper.loadAndMergeMetaMap(MetaAttributeHelper.java:110)
[hbm2java] at net.sf.hibernate.tool.hbm2java.ClassMapping.initWith(ClassMapping.java:160)
[hbm2java] at net.sf.hibernate.tool.hbm2java.ClassMapping.<init>(ClassMapping.java:72)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.handleClass(CodeGenerator.java:128)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.main(CodeGenerator.java:103)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.java:145)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java:95)
[hbm2java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
[hbm2java] at org.apache.tools.ant.Task.perform(Task.java:364)
[hbm2java] at org.apache.tools.ant.Target.execute(Target.java:341)
[hbm2java] at org.apache.tools.ant.Target.performTasks(Target.java:369)
[hbm2java] at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
[hbm2java] at org.apache.tools.ant.Project.executeTargets(Project.java:1062)
[hbm2java] at org.apache.tools.ant.Main.runBuild(Main.java:673)
[hbm2java] at org.apache.tools.ant.Main.startAnt(Main.java:188)
[hbm2java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
[hbm2java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)
Build.xml:

Code:

      <mkdir dir="${gensrc.dir}/${package.dir}/beans"/>
      <taskdef
         name="hbm2java"
         classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask"
         classpathref="lib.class.path"
      />
      <hbm2java output="${gensrc.dir}">
         <fileset dir="${gensrc.dir}">
            <include name="**/*.hbm.xml"/>
         </fileset>
      </hbm2java>

Name and version of the database you are using:
MySQL 4.1.7-max

max · **Posted:** Thu Nov 11, 2004 4:11 pm

if i remember correctly there was an issue with classcast when upgrading commons-collections. This should be fixed now.

Which version of hibernateext are you using ?
If its the latest release then please try the cvs version.