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From Xavier Loiseau <>
Subject Checking the java version
Date Fri, 08 Nov 2002 13:41:19 GMT

What is the simplest way of checking the java version
before running an application ?

What is the simplest way of checking the java version
before compiling an application ?

This is an important issue since several java versions
are often installed in a same computer.

I have tried to solve both problems through the ant
file that you will find below.

But I am still wondering if it is the right way of
solving those problems.

Could anybody confirm that to me ?

Kind regards.


<project name="sample" default="build" basedir="../">

  <target name="run" depends="checkjavaversion">
    <java classname="MyClass"
          classpath="MyClassPath" />

  <target name="compile" depends="checkjavaversion">
    <javac classpath="MyClassPath"
           includes="**/*.java" />
  <target name="checkjavaversion" >

    <condition property="isJavaVersionCorrect">
        <equals arg1="${}"
                arg2="1.3" />

    <fail unless="isJavaVersionCorrect" 
          message="The java version should be 1.3 !"



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