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Editorial Team
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Asked: 2026-06-11T11:20:37+00:00

Using Ant to compile simple Hello World program in Java, and something isn’t working

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Using Ant to compile simple Hello World program in Java, and something isn’t working right. I know the Java code is correct, as it runs using javac. Something is wrong with my Any config file, and I can’t quite figure out what it is. http://pastebin.com/q50L5b0D

and the command line errors I’m getting:

 **Exception in thread "main" java.lang.NoClassDefFoundError: Proj0/class
Caused by: java.lang.ClassNotFoundException: Proj0.class
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: Proj0.class. Program will exit.
**
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1 Answer

  1. Editorial Team

    It just tell you the class Proj0 could not be found when trying to run your application using the ANT target you defined. Are you sure this line is correct ?

    <property name="Proj0.class" value="package.names.Proj0"/>

    The package.names.Proj0 is a strange name for a package, maybe you wanted something like using the actual value of a property called package.names?

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