Hibernate version:

Hibernate - 3.0.5
Hibernate tools- 3.0.0.alpha4a

Project file tree:

$ find htest/
htest/
htest/hibernate.properties
htest/build.xml
htest/lib
htest/lib/hibernate3.jar
htest/lib/hibernate-tools.jar
htest/lib/commons-logging-1.0.4.jar
htest/src
htest/src/datamodel
htest/src/datamodel/People.hbm.xml

htest/hibernate.properties:

hibernate.dialect net.sf.hibernate.dialect.FirebirdDialect
hibernate.connection.driver_class org.firebirdsql.jdbc.FBDriver
hibernate.connection.url jdbc:firebirdsql:localhost:test
hibernate.connection.username user
hibernate.connection.password password

htest/build.xml:

<project name="Hibernate Test Application" default="gen-classes" basedir=".">



<property name="application.name" value="htest"/>



<property name="src.home" value="${basedir}/src"/>

<property name="bin.home" value="${basedir}/bin"/>

<property name="lib.home" value="${basedir}/lib"/>



<path id="classpath">
<fileset dir="${lib.home}"><include name="*.jar"/></fileset>

</path>


<target name="gen-classes">

<taskdef

name="hibernatetool"

classname="org.hibernate.tool.ant.HibernateToolTask"

classpathref="classpath"/>

<hibernatetool destdir=".">

<classpath refid="classpath"/>

<configuration propertyFile="hibernate.properties">

<fileset id="hibernate.mapping.files" dir="${src.home}">

<include name="**/*.hbm.xml" />

</fileset>

</configuration>

<hbm2java/>

</hibernatetool>

</target>



</project>

htest/src/datamodel/People.hbm.xml:

<?xml version="1.0"?>

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

<hibernate-mapping>

<class name="datamodel.People" table="people">
<id name="id" column="id" type="integer" unsaved-value="null">
<generator class="native"/>
</id>
<property name="name" column="name" type="string" length="25" not-null="true"/>
</class>

</hibernate-mapping>

Build output:

$ ant
Buildfile: build.xml

gen-classes:
[hibernatetool] Executing Hibernate Tool with a Standard Configuration
[hibernatetool] 1. task: hbm2java (Generates a set of .java files)

BUILD FAILED
java.lang.ExceptionInInitializerError

Total time: 1 second

What is wrong?

first thing is that you should use version 3 DTD's not version 2 DTD's for hibernate 3 mappings.

furthermore to debug ant, run ant with -debug or -verbose to get the full exception stacktrace.

I have only this jars now in my classpath:

$ ls -l lib
total 1824
-rw-r--r-- 1 john john 38015 May 25 01:03 commons-logging-1.0.4.jar
-rw-r--r-- 1 john john 137589 Aug 2 11:04 hibernate-tools.jar
-rw-r--r-- 1 john john 1674454 May 25 01:00 hibernate3.jar

But I get this error:

$ ant -v

Apache Ant version 1.6.2 compiled on August 26 2004
Buildfile: build.xml
Detected Java version: 1.4 in: /usr/lib/j2se1.4-sun/jre
Detected OS: Linux
parsing buildfile /home/john/workspace/htest/build.xml with URI = file:///home/john/workspace/htest/build.xml
Project base dir set to: /home/john/workspace/htest
Build sequence for target `gen-classes' is [gen-classes]
Complete build sequence is [gen-classes, ]

gen-classes:
[hibernatetool] Executing Hibernate Tool with a Standard Configuration
[hibernatetool] 1. task: hbm2java (Generates a set of .java files)

BUILD FAILED
java.lang.ExceptionInInitializerError
at org.apache.tools.ant.Project.executeTarget(Unknown Source)
at org.apache.tools.ant.Project.executeTargets(Unknown Source)
at org.apache.tools.ant.Main.runBuild(Unknown Source)
at org.apache.tools.ant.Main.startAnt(Unknown Source)
at org.apache.tools.ant.launch.Launcher.run(Unknown Source)
at org.apache.tools.ant.launch.Launcher.main(Unknown Source)
Caused by: java.lang.ExceptionInInitializerError
at org.hibernate.tool.ant.Hbm2JavaGeneratorTask.createExporter(Hbm2JavaGeneratorTask.java:44)
at org.hibernate.tool.ant.GeneratorTask.execute(GeneratorTask.java:32)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:115)
at org.apache.tools.ant.UnknownElement.execute(Unknown Source)
at org.apache.tools.ant.Task.perform(Unknown Source)
at org.apache.tools.ant.Target.execute(Unknown Source)
at org.apache.tools.ant.Target.performTasks(Unknown Source)
... 6 more
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed. (Caused by org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.) (Caused by org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed. (Caused by org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.))
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.hbm2x.POJOExporter.<clinit>(POJOExporter.java:26)
... 13 more
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed. (Caused by org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 17 more
Caused by: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:385)
... 18 more
--- Nested Exception ---
java.lang.ExceptionInInitializerError
at org.hibernate.tool.ant.Hbm2JavaGeneratorTask.createExporter(Hbm2JavaGeneratorTask.java:44)
at org.hibernate.tool.ant.GeneratorTask.execute(GeneratorTask.java:32)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:115)
at org.apache.tools.ant.UnknownElement.execute(Unknown Source)
at org.apache.tools.ant.Task.perform(Unknown Source)
at org.apache.tools.ant.Target.execute(Unknown Source)
at org.apache.tools.ant.Target.performTasks(Unknown Source)
at org.apache.tools.ant.Project.executeTarget(Unknown Source)
at org.apache.tools.ant.Project.executeTargets(Unknown Source)
at org.apache.tools.ant.Main.runBuild(Unknown Source)
at org.apache.tools.ant.Main.startAnt(Unknown Source)
at org.apache.tools.ant.launch.Launcher.run(Unknown Source)
at org.apache.tools.ant.launch.Launcher.main(Unknown Source)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed. (Caused by org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.) (Caused by org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed. (Caused by org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.))
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.hbm2x.POJOExporter.<clinit>(POJOExporter.java:26)
... 13 more
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed. (Caused by org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 17 more
Caused by: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy. You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:385)
... 18 more

Total time: 1 second

this logging stuff has been talked about before - search in the forum