How to use the task?

[Per Thomas Jahr <Pe...@nr.no>]

I want to check if the commapi.jar is available in the projects
classpath. I wrote something like this:

<target name="checkcommapi">
    <available file="commapi.jar" property="commapipresent"/>
    <echo> 
      ${commapipresent}
    </echo>
</target>

But it seems like the property commapipresent always equals false. The
commapi.jar is installed in the jre/lib/ext and should be in the
bootclasspath. When I run ant with -verbose I get this message:

checkcommapi:
[available] Unable to find file H:\projects\imst\IMST\commapi.jar to set
property commapipresent
     [echo]
      false

Has anyone else used the <available> task with sucess? 

Per Thomas

Re: How to use the task?

[Stefan Bodewig <bo...@apache.org>]

Per Thomas Jahr <Pe...@nr.no> wrote:

> I want to check if the commapi.jar is available in the projects
> classpath.

Then you shouldn't use the file attribute of <available> as this
searches for files in the filesystem, not for parts of your
classpath.

What you want to do is to use the classname attribute and search for a
class that can only be loaded from that specific jar file.

Take a look at Ant's own buildfile - the check_for_optional_packages
target.

Stefan