Hibernate version: 3.1beta1
Hibernate version: 3.1.0alpha5
Name and version of the database you are using: MySQL 5.0.11

The following Ant task yields a NoSuchMethodErrorException:

<taskdef name="hibernatetool"
classname="org.hibernate.tool.ant.HibernateToolTask"
classpathref="hibernateToolTask.classpath"/>

<hibernatetool destdir="${mysql.dir}">
<annotationconfiguration configurationfile="${hibernate.cfg.xml}"/>
<hbm2ddl drop="false" outputfilename="createTables.gen.sql"/>
</hibernatetool>

Full stack trace of any exception that occurs:
java.lang.NoSuchMethodError: org.hibernate.tool.hbm2ddl.SchemaExport.setFormat(Z)Lorg/hibernate/tool/hbm2ddl/SchemaExport;
at org.hibernate.tool.ant.Hbm2DDLGeneratorTask.execute(Hbm2DDLGeneratorTask.java:46)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:122)
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)

use the hibernate 3.1 .jar from the tools....

Now Ant produces this error message:

[hibernatetool] 1. task: hbm2ddl (Generates database schema)
BUILD FAILED
java.lang.NoSuchMethodError: org.hibernate.cfg.Mappings.<init>(Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/List;Ljava/util/List;Lorg/hibernate/cfg/NamingStrategy;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;)V

using annotations with the tools has a bug - you will need to build the cvs version of annotations (see other topics that has done this)