cannot find ant org.apache.tools.ant.launch.Launcher class

[Steven Dahlin]

I have setup jenkins using the latest war 1.434 on tomcat 7. However
when I attempt to build a project I get the following error:

[workspace] $ ant -v build
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/
tools/ant/launch/Launcher
Caused by: java.lang.ClassNotFoundException:
org.apache.tools.ant.launch.Launcher
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.tools.ant.launch.Launcher.
Program will exit.
Build step 'Invoke Ant' marked build as failure
Archiving artifacts
Finished: FAILURE

The needed jars ant-launcher-1.8.0.jar and ant-1.8.0.jar are in the
jenkins WEB-INF/lib directory so I am unclear as to why it cannot find
them.

Thanks

[Steven Dahlin]

Neve mind. I found out that the ant executable did not match the
jars. That has been fixed.