How to verify the changes made in ant build file without running the whole build again?

If you happen to use any IDE(like Eclipse for JEE Developers edition), they include support for editing of ant build files, including code completion, syntactical error detection etc.

Syntactic parsing of build. Xml happens during start of ant. You can just add "empty" ant task that does nothing and run it to validate your build.xml.

Candidate for such empty task is task which just prints out targets declared inside build. Xml, i.e. , "usage help page".

Besides this kind of validation, you can't be 100% sure your build. Xml is correct without actually running build process.

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