This works for me:
<project>
<property environment="env"/>
<condition property="isset">
<isset property="env.JAVA_HOME"/>
</condition>
<echo>
isset: ${isset}
JAVA_HOME: ${env.JAVA_HOME}
</echo>
</project>
But beware of case sensitivy of the env variable: JAVA_HOME != java_home
Jan
>-----Ursprüngliche Nachricht-----
>Von: gengyun [mailto:[email protected]]
>Gesendet: Montag, 19. Juli 2010 04:03
>An: user
>Betreff: problem while using enviroment attributes
>
>hi
>
>thx for answering my question
>
>I was wondering how to judge whether a enviroment attribute is
>set or not, I tried the <condition> task, but I can't find a
>proper nested element to do the right work. for example I 've tried:
>
><property enviroment="env"/>
><property name="java.enviroment" value="${env.JAVA_HOME}"/>
><condition property="java.enviroment.isset">
> <and>
> <isset property="java.enviroment"/>
> </and>
></condition>
>
>but the property "java.enviroment" will be set no matter the
>JAVA_HOME is set or not. If set ,it will be the correct path
>to java-home-dir. but if not ,then it will be string
>"${env.JAVA_HOME}" and the condition property
>"java.enviroment.isset" will also be "true".
>
>I also tried <istrue> <available> but none of them seem to
>work, plz help thx a lot!
>
>
>2010-07-19
>
>
>
>gengyun
>
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