I just installed the latest available Eclipse version (3.2 milestone 5) and couldn’t run my ANT builds anymore. The error I got in the alert box was “Could not find the main class. Program will exit”.
The problem was that the ANT_HOME variable was still pointing to the previous Eclipse folder and the solution was simply to change the path. This can be done through Window->Preferences->Ant->Runtime. Once there, click the “Ant home…” button in the “Classpath” tab and browse to the ANT plugin folder in your Eclipse installation. Now hit the OK button and try to run the build file again. Everything should work again.
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