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From peter reilly <>
Subject Re: Ant 1.6 and Namespaces
Date Tue, 23 Sep 2003 17:18:45 GMT
On Tuesday 23 September 2003 18:08, Kevin LaVergne wrote:
> 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

The problem is the "without declaring them", ant 1.5 and before did
not enable namespace support in the xml parser, so the prefix:taskname was
passed tru to and the name included the "prefix:" part.

Ant 1.6 supports xml's namespace, which means that you have to define
the namespace URI. The URI can be anything (except names beginning with ant),
but you need to specify the URI when you use typedef or taskdef.

<project xmlns:local="localnamespace">
   <taskdef name="task" uri="localnamespace" classname="org.local.Task"/>
   <taskdef file="" uri="localnamespace"/>
   or using an antlib
   <typedef file="localdefinitions.xml" uri="localnamespace"/>
   <local:task a="b"/>



> 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?
> Thanks,
> Kevin LaVergne
> Here is the error that I get (I have done everything that it says in the
> error before sending this email):
> C:\views\klavergn_synergy_1.0\Public\buildfiles\build-settings.ent:397:
> 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
> classpath
> 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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