用映射文件生成类文件时出错

[cmengzhongren]

小弟刚开始学习hibernate不知道出什么错了，请大家指教，Thank you！
ant的build.xml文件片断如下：
30 <!-- Teach Ant how to use Hibernate's code generation tool -->

31 <taskdef name="hbm2java"

32 classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask"

33 classpathref="project.class.path"/>

34

35 <!-- Generate the java code for all mapping files in our source tree -->

36 <target name="codegen"

37 description="Generate Java source from the O/R mapping files">

38 <hbm2java output="${source.root}">

39 <fileset dir="${source.root}">

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

41 </fileset>

42 </hbm2java>

43 </target>

错误信息如下：
codegen:
[hbm2java] Processing 1 mapping files.

BUILD FAILED
E:\HibernateProject\build.xml:38: Caused by:
Caused by:
java.lang.NoClassDefFoundError: net/sf/hibernate/MappingException
at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.
java:145)
at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java
:93)
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(DefaultExe
cutor.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)

at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.processFile(Hbm2JavaTask.
java:149)
at net.sf.hibernate.tool.hbm2java.Hbm2JavaTask.execute(Hbm2JavaTask.java
:93)
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(DefaultExe
cutor.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)

[SuperKnight]

Caused by:
java.lang.NoClassDefFoundError: net/sf/hibernate/MappingException


没有找到类，好好看看路径和你的配置是否一致

[cmengzhongren]

配置好像没错呀，hibernate-tools.jar已经放到了lib中了