I have downloaded source code for Java Persistence with Hibernate book and trying to execute the helloworld program. I am getting the following error when I execute

ant schemaexport

Apache Ant version 1.6.5 compiled on June 2 2005
Buildfile: build.xml
Detected Java version: 1.5 in: C:\jdk1.5.0_12\jre
Detected OS: Windows XP
parsing buildfile D:\Projects\hibernate\helloWorld\build.xml with URI = file:///D:/Projects/hibernate/helloWorld/build.xml
Project base dir set to: D:\Projects\hibernate\helloWorld
Build sequence for target(s) `schemaexport' is [compile, copymetafiles, schemaexport]
Complete build sequence is [compile, copymetafiles, schemaexport, startdb, clean, dbmanager, run, ]

compile:
[javac] META-INF\MANIFEST.MF skipped - don't know how to handle it
[javac] hello\HelloWorld.java added as hello/HelloWorld.class doesn't exist.
[javac] hello\Message.java added as hello/Message.class doesn't exist.
[javac] hello\message.hbm.xml skipped - don't know how to handle it
[javac] hibernate.cfg.xml skipped - don't know how to handle it
[javac] persistence\HibernateUtil.java added as persistence/HibernateUtil.class doesn't exist.
[javac] Compiling 3 source files to D:\Projects\hibernate\helloWorld\build
[javac] Using modern compiler
[javac] Compilation arguments:
[javac] '-d'
[javac] 'D:\Projects\hibernate\helloWorld\build'
[javac] '-classpath'
[javac] 'D:\Projects\hibernate\helloWorld\build;D:\Projects\hibernate\helloWorld\lib\antlr-2.7.6.jar;D:\Projects\hibernate\helloWorld\lib\asm-attrs.jar;D:\Projects\hibernate\helloWorld\lib\asm.jar;D:\Projects\hibernate\helloWorld\lib\c3p0-0.9.0.jar;D:\Projects\hibernate\helloWorld\lib\cglib-2.1.
3.jar;D:\Projects\hibernate\helloWorld\lib\commons-collections-2.1.1.jar;D:\Projects\hibernate\helloWorld\lib\commons-logging-1.0.4.jar;D:\Projects\hibernate\helloWorld\lib\dom4j-1.6.1.jar;D:\Projects\hibernate\helloWorld\lib\hibernate-tools.jar;D:\Projects\hibernate\helloWorld\lib\hibernate3.jar;D:
\Projects\hibernate\helloWorld\lib\hsqldb.jar;D:\Projects\hibernate\helloWorld\lib\jta.jar;D:\Projects\hibernate\helloWorld\lib\log4j-1.2.13.jar;D:\Projects\hibernate\helloWorld\lib\mysql-connector-java-3.1.14-bin.jar;D:\apache-ant-1.6.5\lib\ant-launcher.jar;D:\Projects\hibernate\helloWorld;D:\Tomca
t 5.5\webapps\axis\WEB-INF\lib\axis.jar;C:\selenium-remote-control-0.9.2\selenium-server-0.9.2\selenium-server.jar;D:\apache-ant-1.6.5\lib\ant-antlr.jar;D:\apache-ant-1.6.5\lib\ant-apache-bcel.jar;D:\apache-ant-1.6.5\lib\ant-apache-bsf.jar;D:\apache-ant-1.6.5\lib\ant-apache-log4j.jar;D:\apache-ant-1
.6.5\lib\ant-apache-oro.jar;D:\apache-ant-1.6.5\lib\ant-apache-regexp.jar;D:\apache-ant-1.6.5\lib\ant-apache-resolver.jar;D:\apache-ant-1.6.5\lib\ant-commons-logging.jar;D:\apache-ant-1.6.5\lib\ant-commons-net.jar;D:\apache-ant-1.6.5\lib\ant-icontract.jar;D:\apache-ant-1.6.5\lib\ant-jai.jar;D:\apach
e-ant-1.6.5\lib\ant-javamail.jar;D:\apache-ant-1.6.5\lib\ant-jdepend.jar;D:\apache-ant-1.6.5\lib\ant-jmf.jar;D:\apache-ant-1.6.5\lib\ant-jsch.jar;D:\apache-ant-1.6.5\lib\ant-junit.jar;D:\apache-ant-1.6.5\lib\ant-netrexx.jar;D:\apache-ant-1.6.5\lib\ant-nodeps.jar;D:\apache-ant-1.6.5\lib\ant-starteam.
jar;D:\apache-ant-1.6.5\lib\ant-stylebook.jar;D:\apache-ant-1.6.5\lib\ant-swing.jar;D:\apache-ant-1.6.5\lib\ant-trax.jar;D:\apache-ant-1.6.5\lib\ant-vaj.jar;D:\apache-ant-1.6.5\lib\ant-weblogic.jar;D:\apache-ant-1.6.5\lib\ant-xalan1.jar;D:\apache-ant-1.6.5\lib\ant-xslp.jar;D:\apache-ant-1.6.5\lib\an
t.jar;D:\apache-ant-1.6.5\lib\xercesImpl.jar;D:\apache-ant-1.6.5\lib\xml-apis.jar;C:\jdk1.5.0_12\lib\tools.jar'
[javac] '-sourcepath'
[javac] 'D:\Projects\hibernate\helloWorld\src'
[javac] '-g:none'
[javac]
[javac] The ' characters around the executable and arguments are
[javac] not part of the command.
[javac] Files to be compiled:
[javac] D:\Projects\hibernate\helloWorld\src\hello\HelloWorld.java
[javac] D:\Projects\hibernate\helloWorld\src\hello\Message.java
[javac] D:\Projects\hibernate\helloWorld\src\persistence\HibernateUtil.java

copymetafiles:
[copy] hello\message.hbm.xml added as hello/message.hbm.xml doesn't exist.
[copy] hibernate.cfg.xml added as hibernate.cfg.xml doesn't exist.
[copy] Copying 2 files to D:\Projects\hibernate\helloWorld\build
[copy] Copying D:\Projects\hibernate\helloWorld\src\hibernate.cfg.xml to D:\Projects\hibernate\helloWorld\build\hibernate.cfg.xml
[copy] Copying D:\Projects\hibernate\helloWorld\src\hello\message.hbm.xml to D:\Projects\hibernate\helloWorld\build\hello\message.hbm.xml

schemaexport:
[hibernatetool] Executing Hibernate Tool with a Standard Configuration
[hibernatetool] 1. task: hbm2ddl (Generates database schema)

BUILD FAILED
java.lang.ExceptionInInitializerError
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1225)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: java.lang.ExceptionInInitializerError
at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:45)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:171)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
... 7 more
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@177b3cd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused
by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@177b3cd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.hibernate.tool.hbm2ddl.SchemaExport.<clinit>(SchemaExport.java:44)
... 14 more
Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@177b3cd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 18 more
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)
at java.lang.Class.getConstructor0(Class.java:2671)
at java.lang.Class.getConstructor(Class.java:1629)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)
... 19 more
--- Nested Exception ---
java.lang.ExceptionInInitializerError
at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:45)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:171)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@177b3cd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused
by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@177b3cd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.hibernate.tool.hbm2ddl.SchemaExport.<clinit>(SchemaExport.java:44)
... 14 more
Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@177b3cd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 18 more
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)
at java.lang.Class.getConstructor0(Class.java:2671)
at java.lang.Class.getConstructor(Class.java:1629)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)
... 19 more

Total time: 2 seconds
D:\Projects\hibernate\helloWorld>

I have not modified anything within the code, all the configuration files are as is. Please help.