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Posted to user@ant.apache.org by "KARR, DAVID (ATTCINW)" <dk...@att.com> on 2009/12/21 00:44:42 UTC

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

Posted by "Moore, Kent" <Ke...@fnis.com>.
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:dk068x@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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AW: Best way to have script fail if not using new enough JDK?

Posted by Ja...@rzf.fin-nrw.de.
<fail message="Not a Java 1.6+">
  <not><available classname="java.util.ServiceLoader"/></not>
</fail> 

(see target "check_for_optional_packages" in Ants own buildfile)


Jan

>-----Ursprüngliche Nachricht-----
>Von: KARR, DAVID (ATTCINW) [mailto:dk068x@att.com] 
>Gesendet: Montag, 21. Dezember 2009 00:45
>An: Ant Users List
>Betreff: 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.
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
>For additional commands, e-mail: user-help@ant.apache.org
>
>

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