【发布时间】：2013-08-03 03:12:12
【问题描述】：
我正在尝试使用SSHEXEC ANT task，它需要JSCH library。
当我尝试使用 SSHEXEC 任务时，我得到以下信息：
BUILD FAILED
/home/www/test/build/build.xml:140: Problem: failed to create task or type sshexec
Cause: the class org.apache.tools.ant.taskdefs.optional.ssh.SSHExec was not found.
This looks like one of Ant's optional components.
Action: Check that the appropriate optional JAR exists in
-/usr/share/ant/lib
-/root/.ant/lib
-a directory added on the command line with the -lib argument
Do not panic, this is a common problem.
The commonest cause is a missing JAR.
This is not a bug; it is a configuration problem
我已经将jsch-0.1.50.jar（最新的）放在/usr/share/ant/lib、/root/.ant/lib中，甚至尝试了以下方法：
ant my-sshexec-target-name -lib /path/to/jsch-0.1.50.jar
而且我不断收到同样的错误。我还尝试在所有相同的位置将文件重命名为 jsch.jar。结果相同。我在这里做错了什么？
更新
我还跑了ant -diagnostics，看到了这个：
...
-------------------------------------------
Tasks availability
-------------------------------------------
p4reopen : Not Available (the implementation class is not present)
image : Not Available (the implementation class is not present)
sshexec : Not Available (the implementation class is not present)
wlrun : Not Available (the implementation class is not present)
p4label : Not Available (the implementation class is not present)
p4revert : Not Available (the implementation class is not present)
p4submit : Not Available (the implementation class is not present)
scp : Not Available (the implementation class is not present)
p4change : Not Available (the implementation class is not present)
p4delete : Not Available (the implementation class is not present)
p4integrate : Not Available (the implementation class is not present)
rexec : Not Available (the implementation class is not present)
stlist : Not Available (the implementation class is not present)
telnet : Not Available (the implementation class is not present)
etc...
注意：sshexec : Not Available（实现类不存在）
这是什么意思？
【问题讨论】：
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嘿，杰克，答案是什么？此线程中没有任何帮助。