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problem at using hibernate extension to build *java from *.hbm.xml

 
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i sui \
this is a n example fo Hibernate: A Developer's Notebook
I use hibernate 2.1,hibernate extension 2.1 to build *.hbm.xml

my Track.hbm.xml is as followed
<?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>

<class name="com.oreilly.hh.Track" table="TRACK">
<meta attribute="class-description">
Represents a single playable track in the music database.
@author Jim Elliott (with help from Hibernate)
</meta>

<id name="id" type="int" column="TRACK_ID">
<meta attribute="scope-set">protected</meta>
<generator class="native"/>
</id>

<property name="title" type="string" not-null="true"/>

<property name="filePath" type="string" not-null="true"/>

<property name="playTime" type="time">
<meta attribute="field-description">Playing time</meta>
</property>

<property name="added" type="date">
<meta attribute="field-description">When the track was created</meta>
</property>

<property name="volume" type="short" not-null="true">
<meta attribute="field-description">How loud to play the track</meta>
</property>

</class>
</hibernate-mapping>

my build.xml is as followed
<?xml version="1.0"?>
<project name="Harnessing Hibernate: The Developer's Notebook"
default="db" basedir=".">

<!-- Set up properties containing important project directories -->
<property name="source.root" value="src"/>
<property name="class.root" value="classes"/>
<property name="lib.dir" value="lib"/>
<property name="data.dir" value="data"/>

<!-- Set up the class path for compilation and execution -->
<path id="project.class.path">
<!-- Include our own classes, of course -->
<pathelement location="${class.root}" />
<!-- Include jars in the project library directory -->
<fileset dir="${lib.dir}">
<include name="*.jar"/>
</fileset>
</path>

<target name="db" description="Runs HSQLDB database management UI
against the database file--use when application is not running">
<java classname="org.hsqldb.util.DatabaseManager"
fork="yes">
<classpath refid="project.class.path"/>
<arg value="-driver"/>
<arg value="org.hsqldb.jdbcDriver"/>
<arg value="-url"/>
<arg value="jdbc:hsqldb:${data.dir}/music"/>
<arg value="-user"/>
<arg value="sa"/>
</java>
</target>

<!-- Teach Ant how to use Hibernate's code generation tool -->
<taskdef name="hbm2java"
classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask"
classpathref="project.class.path"/>

<!-- Generate the java code for all mapping files in our source tree -->
<target name="codegen"
description="Generate Java source from the O/R mapping files">
<hbm2java output="${source.root}">
<fileset dir="${source.root}">
<include name="**/*.hbm.xml"/>
</fileset>
</hbm2java>
</target>

<!-- Create our runtime subdirectories and copy resources into them -->
<target name="prepare" description="Sets up build structures">
<mkdir dir="${class.root}"/>

<!-- Copy our property files and O/R mappings for use at runtime -->
<copy todir="${class.root}" >
<fileset dir="${source.root}" >
<include name="**/*.properties"/>
<include name="**/*.hbm.xml"/>
</fileset>
</copy>
</target>

<!-- Compile the java source of the project -->
<target name="compile" depends="prepare"
description="Compiles all Java classes">
<javac srcdir="${source.root}"
destdir="${class.root}"
debug="on"
optimize="off"
deprecation="on">
<classpath refid="project.class.path"/>
</javac>
</target>

<!-- Generate the schemas for all mapping files in our class tree -->
<target name="schema" depends="compile"
description="Generate DB schema from the O/R mapping files">

<!-- Teach Ant how to use Hibernate's schema generation tool -->
<taskdef name="schemaexport"
classname="net.sf.hibernate.tool.hbm2ddl.SchemaExportTask"
classpathref="project.class.path"/>

<schemaexport properties="${class.root}/hibernate.properties"
quiet="no" text="no" drop="no">
<fileset dir="${class.root}">
<include name="**/*.hbm.xml"/>
</fileset>
</schemaexport>
</target>

</project>

D:\java\hproject>ant codegen
Buildfile: build.xml

codegen:
[hbm2java] Processing 1 files.
[hbm2java] Building hibernate objects
[hbm2java] log4j:WARN No appenders could be found for logger (net.sf.hibernate.util.DTDEntityResolv
er).
[hbm2java] log4j:WARN Please initialize the log4j system properly.
[hbm2java] java.lang.NullPointerException
[hbm2java] at net.sf.hibernate.tool.hbm2java.BasicRenderer.isPropertySet(BasicRenderer.java:611
)
[hbm2java] at net.sf.hibernate.tool.hbm2java.BasicRenderer.generateConcreteEmptyClasses(BasicRe
nderer.java:332)
[hbm2java] at net.sf.hibernate.tool.hbm2java.BasicRenderer.render(BasicRenderer.java:59)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Generator.write(Generator.java:138)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Generator.writeRecur(Generator.java:115)
[hbm2java] at net.sf.hibernate.tool.hbm2java.Generator.generate(Generator.java:104)
[hbm2java] at net.sf.hibernate.tool.hbm2java.CodeGenerator.main(CodeGenerator.java:125)
[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.executeSortedTargets(Project.java:1216)
[hbm2java] at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
[hbm2java] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:4
0)
[hbm2java] at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
[hbm2java] at org.apache.tools.ant.Main.runBuild(Main.java:668)
[hbm2java] at org.apache.tools.ant.Main.startAnt(Main.java:187)
[hbm2java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
[hbm2java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
 
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Did you check the Errata page of this book. (Search for "AUTHOR NOTE")

Try to download the latest source from O'Reilly's homepage.
 
Acetylsalicylic acid is aspirin. This could be handy too:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
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