ant:由于NoClassDefFoundError导致ftp任务失败

Question

我一直在关注一些示例源代码,但是在执行ftp任务时遇到错误.这是我的build.xml文件:

?xml version="1.0"?>
<project name="HelloWorld" default="deploy">
  <target name="init">
    <mkdir dir="build/classes" />
    <mkdir dir="dist" />
  </target>
  <target name="compile" depends="init">
    <javac includeantruntime="false"
      srcdir="src"
      destdir="build/classes"/>
  </target>
  <target name="doc" depends="init">
    <javadoc destdir="build/classes"
      sourcepath="src"
      packagenames="org.*" />
  </target>
  <target name="package" depends="compile,doc">
    <jar destfile="dist/project.jar"
      basedir="build/classes" />
  </target>
  <taskdef name="ftp" classname="org.apache.tools.ant.taskdefs.optional.net.FTP">
    <classpath>
      <pathelement location="/usr/local/ant/lib/ant-commons-net.jar"/>
    </classpath>
  </taskdef>
  <target name="deploy" depends="package">
    <ftp classname="org.apache.tools.ant.taskdefs.optional.net.FTP"
      server="${server.name}"
      userid="${ftp.username}"
      password="${ftp.password}">
      <fileset dir="dist" />
    </ftp>
  </target>
</project>

以下是一些设置:

$ ant -version
Apache Ant(TM) version 1.9.0 compiled on March 5 2013
$ echo $ANT_HOME
/usr/local/ant
$ ls -l $ANT_HOME
lrwxrwxrwx 1 root root 17 May 20 11:54 /usr/local/ant -> apache-ant-1.9.0/

这是输出与我得到的错误.我认为ant build文件应该是可移植的.这里有什么问题？不知何故,"Ant"FTP任务会查找一个类名,该类来自一个不与ant一起分发的类.我尝试将任务指向使用ant分发的类,但是ant似乎仍然没有找到与它正在寻找的ftp任务相对应的类.

Buildfile: /home/johndoe/ex/build.xml

init:

compile:

doc:
  [javadoc] Generating Javadoc
  [javadoc] Javadoc execution
  [javadoc] Loading source files for package org.example.helloworld...
  [javadoc] Constructing Javadoc information...
  [javadoc] Standard Doclet version 1.7.0_21
  [javadoc] Building tree for all the packages and classes...
  [javadoc] Building index for all the packages and classes...
  [javadoc] Building index for all classes...

package:
      [jar] Building jar: /home/johndoe/ex/dist/project.jar

deploy:

BUILD FAILED
/home/johndoe/ex/build.xml:30: Could not create type ftp due to java.lang.NoClassDefFoundError: org/apache/commons/net/ftp/FTPClientConfig
    at org.apache.tools.ant.taskdefs.optional.net.FTP$LanguageCode.getValidLanguageCodes(FTP.java:2698)
    at org.apache.tools.ant.taskdefs.optional.net.FTP$LanguageCode.<clinit>(FTP.java:2694)
    at org.apache.tools.ant.taskdefs.optional.net.FTP.<init>(FTP.java:137)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.apache.tools.ant.AntTypeDefinition.innerCreateAndSet(AntTypeDefinition.java:328)
    at org.apache.tools.ant.AntTypeDefinition.createAndSet(AntTypeDefinition.java:274)
    at org.apache.tools.ant.AntTypeDefinition.icreate(AntTypeDefinition.java:219)
    at org.apache.tools.ant.AntTypeDefinition.create(AntTypeDefinition.java:206)
    at org.apache.tools.ant.ComponentHelper.createComponent(ComponentHelper.java:285)
    at org.apache.tools.ant.ComponentHelper.createComponent(ComponentHelper.java:263)
    at org.apache.tools.ant.UnknownElement.makeObject(UnknownElement.java:417)
    at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:163)
    at org.apache.tools.ant.Task.perform(Task.java:347)
    at org.apache.tools.ant.Target.execute(Target.java:435)
    at org.apache.tools.ant.Target.performTasks(Target.java:456)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
    at org.apache.tools.ant.Main.runBuild(Main.java:851)
    at org.apache.tools.ant.Main.startAnt(Main.java:235)
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.net.ftp.FTPClientConfig
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 26 more

Total time: 2 seconds

理想情况下,我不应该下载其他类来让ant工作.它应该开箱即用,否则它不便携.另外,如果有人可以帮我下载缺少的课程,那将会有很大的帮助.

谢谢.

Answer 1

我可以通过从http://commons.apache.org/proper/commons-net/download_net.cgi下载commons-net-3.2-bin.tar.gz 并安装commons-net-3.2.jar 来解决这个问题.我的/ usr/local/ant/lib文件夹.

问候.