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ANT failed Optional XMLValidate task

David Jung

Joined: Mar 05, 2010
Posts: 2
I exprienced a strange issue in ANT built tool when using optioanl task XMLValidate.
The XMLValidate task Succeed when one call the ANT from commandline. However, I call ANT file with JAva program using APIS provided by Apache foundation with class "org.apache.tools.ant.Project".

I wonder why it succeeds when called through commanbdline and fails when called through java program.

Any help is appreciated.


Here are further details:

ANT Version: 1.6.5
Java VErsion: 1.5.0_16

Error Reported:

Could not create task or type of type: xmlvalidate.

Ant could not find the task or a class this task relies upon.

This is common and has a number of causes; the usual
solutions are to read the manual pages then download and
install needed JAR files, or fix the build file:
- You have misspelt 'xmlvalidate'.
Fix: check your spelling.
- The task needs an external JAR file to execute
and this is not found at the right place in the classpath.
Fix: check the documentation for dependencies.
Fix: declare the task.
- The task is an Ant optional task and the JAR file and/or libraries
implementing the functionality were not found at the time you
yourself built your installation of Ant from the Ant sources.
Fix: Look in the ANT_HOME/lib for the 'ant-' JAR corresponding to the
task and make sure it contains more than merely a META-INF/MANIFEST.MF.
If all it contains is the manifest, then rebuild Ant with the needed
libraries present in ${ant.home}/lib/optional/ , or alternatively,
download a pre-built release version from apache.org
- The build file was written for a later version of Ant
Fix: upgrade to at least the latest release version of Ant
- The task is not an Ant core or optional task
and needs to be declared using <taskdef>.
- You are attempting to use a task defined using
<presetdef> or <macrodef> but have spelt wrong or not
defined it at the point of use

Remember that for JAR files to be visible to Ant tasks implemented
in ANT_HOME/lib, the files must be in the same directory or on the

Please neither file bug reports on this problem, nor email the
Ant mailing lists, until all of these causes have been explored,
as this is not an Ant bug.
Peter Johnson

Joined: May 14, 2008
Posts: 5812

Did you include all of the necessary JAR files in your app's classpath? I think that when ant is run from the command line that it automatically includes all of the JARs in the lib directory, but when invoked from an app you must include the JARs in your classpath. (This is just a guess. If I am wrong I'm sure someone will let me know. )

JBoss In Action
David Jung

Joined: Mar 05, 2010
Posts: 2
Thanks for your reply. I am a newbee in ANT and wonder if you know the jar file containing xmlvalidate task.

Peter Johnson

Joined: May 14, 2008
Posts: 5812

It is in ant_home/lib/ant-nodeps.jar
Don't get me started about those stupid light bulbs.
subject: ANT failed Optional XMLValidate task
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