Ant scp and sshexec task issues in Mac

Last week when I tried to run my ant target using scp and sshexec task in my macbook pro, I got the following issues:

1) scp task issue
Problem: failed to create task or type scp
Cause: the class org.apache.tools.ant.taskdefs.optional.ssh.Scp 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
        -/Users/steve/.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.

2) sshexec task issue
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
        -/Users/steve/.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.

I already download the jsch-0.1.44.jar from Jcraft,  and copied the jar file into folder /usr/share/ant/lib, and I also tried to put the jar file into different folder as the error suggested, but no help.
Finally I found this article:, it mentioned that in Mac, the ant-jsch.jar is missing! 
and when I look at the /usr/share/ant/lib folder, yes there is no ant-jsch.jar file!  So I downloaded the ant 1.8.2 from ant website, unpack it, and copy it into the /usr/share/ant/lib folder, it just works!

In summary, to make the ant scp and sshexec task work in Mac, you need to do 2 things:

1. Install ant-jsch.jar file: download the ant package from ant website, then copy the ant-jsch.jar into /usr/shar/ant/lib folder
2. Go to Jcraft website, download the latest version of jsch jar file, copy it into /usr/share/ant/lib