I just took the Java Development with Ant Quiz. The result revealed a couple issues in my Ant tutorial pages that are now corrected. First, the location attribute should be used instead of the value attribute when defining a property location This binds the property to a fixed filesystem location rather than a string in case it is passed to another process. And second, the java task should use fork="true" to provide full access to the Java runtime classes and to prevent a call to System.exit() from terminating Ant's runtime.