开始休眠3.5-Ant任务出现问题

我正在努力通过“开始冬眠3.5”,我遇到了一个最初的障碍。

当我跑步时 ant exportDDL ,我得到以下错误:

exportDDL:
   [htools] Executing Hibernate Tool with a Hibernate Annotation/EJB3 Configuration
   [htools] 1. task: hbm2ddl (Generates database schema)
   [htools] SLF4J: The requested version 1.6 by your slf4j binding is not compatible with [1.5.5, 1.5.6, 1.5.7, 1.5.8]
   [htools] SLF4J: See http://www.slf4j.org/codes.html#version_mismatch for further details.
   [htools] An exception occurred while running exporter #2:hbm2ddl (Generates database schema)
   [htools] To get the full stack trace run ant with -verbose
   [htools] Problems in creating a AnnotationConfiguration. Have you remembered to add it to the classpath ?
   [htools] java.lang.NoSuchMethodError: org.slf4j.helpers.MessageFormatter.format(Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)Lorg/slf4j/helpers/FormattingTuple;

BUILD FAILED
C:\hibernate\project\build.xml:30: Problems in creating a AnnotationConfiguration. Have you
remembered to add it to the classpath ?

使用以下Ant任务:

<target name="exportDDL" depends="compile">
    <mkdir dir="${sql}"/>
    <htools destdir="${sql}">
        <classpath refid="classpath.tools"/>
        <annotationconfiguration
                configurationfile="${src}/hibernate.cfg.xml"/>
        <hbm2ddl drop="true" outputfilename="sample.sql"/>
    </htools>
</target>
<target name="compile">
    <javac srcdir="${src}" destdir="${bin}" classpathref="classpath.base"/>
</target>

这是怎么回事? ant compile 很好,但是 exportDDL 任务没有。sl4j jar在类路径上,我下载了 slf4j-simple-1.6.1.jar . 思想?