RE: Best way to have script fail if not using new enough JDK?

[Moore, Kent]

We enforce the java version using one of these two routines in our init target:

        <!-- check for java version and fail build immediately if not using the 
correct version -->
        <echo message="Java Version: ${java.version}"/>
        <echo message="Java home: ${java.home}"/>
        <fail message="Unsupported Java version: ${java.version}. Make sure 
that the version of the Java compiler is 1.6.">
            <condition>
                <not>
                    <contains string="${java.version}" substring="1.6" 
casesensitive="false" />
                </not>
            </condition>
        </fail>


or, to allow a minimum java version - 

        <!-- check for java version and fail build immediately if not using the 
correct version -->
        <echo message="Java Version: ${java.version}"/>
        <echo message="Java home: ${java.home}"/>
        <fail message="Unsupported Java version: ${java.version}. Please make 
sure the version of the Java compiler is 1.5 (5.0) or greater.">
            <condition>
                <not>
                    <or>
                        <contains string="${java.version}" substring="1.5" 
casesensitive="false" />
                        <contains string="${java.version}" substring="1.6" 
casesensitive="false" />
                    </or>
                </not>
            </condition>
        </fail>




-----Original Message-----
From: KARR, DAVID (ATTCINW) [mailto:dk0...@att.com]
Sent: Sun 12/20/2009 6:44 PM
To: Ant Users List
Subject: Best way to have script fail if not using new enough JDK?
 
I need to have my Ant script abort if the current JDK version is older
than the project needs (1.6).

I noticed a "JavaVersionTask" sample at <http://onjava.com/lpt/a/6264>
which would probably help, but I wonder if there's an easier way since
that article was written (4 years ago).

I can see the possibility of doing this with a Groovy scriptcondition to
set the property to check, but I can't figure out how I can get Groovy
to set Ant properties, or to return a value that would set the property.

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