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From Kevin LaVergne <>
Subject Ant 1.6 and Namespaces
Date Tue, 23 Sep 2003 17:08:55 GMT
I am attempting to test Ant 1.6 on my company's buildfiles. We have been 
using namespaces (without declaring them) but it now seems that they won't 
work at all. I have found that when I have the namespace in front of a task 
name, I get an error saying that the namespace is not declared. If I then 
declare the namespace I get an error saying that the task class can't be 
found. Is the namespace URI supposed to be pointing to something specific?


Kevin LaVergne

Here is the error that I get (I have done everything that it says in the 
error before sending this email):

Could not create task or type of type:

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 
    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 optional.jar is absent
    Fix: look for optional.jar in ANT_HOME/lib, download if needed
  - The task was not built into optional.jar as dependent
    libraries were not found at build time.
    Fix: look in the JAR to verify, then rebuild with the needed
    libraries, or download a release version from
  - 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>.

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.

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