I have a similar problem but on the run time level. I have been working on a task that should among other things upgrade the production (deployment)JDK/JRE. To be able to do this I have to identify exactly what version of Java that is installed.
With other words is there a more precise method for Java version identification? /Christian Holmqvist > -----Ursprungligt meddelande----- > Från: Stefan Bodewig [mailto:bodewig@;apache.org] > Skickat: den 8 november 2002 15:11 > Till: [EMAIL PROTECTED] > Ämne: Re: Checking the java version > > > On Fri, 8 Nov 2002, Ilja Preu <[EMAIL PROTECTED]> wrote: > > > I am using ${java.specification.version} instead of > > ${ant.java.version} - I don't know wether this makes a difference, > > though. > > Yes, it does. > > ${java.specification.version} is a system property JVM implementors > can (must?) implement, but I'm not sure whether the rules are well > defined here. I wouldn't bet that Kaffee will set it correctly for > example. > > ${ant.java.version} is what Ant has detected. Ant's detection code > tries to load a certain set of classes that have been added in certain > Java versions, the code is > > try { > javaVersion = JAVA_1_0; > javaVersionNumber=10; > Class.forName("java.lang.Void"); > javaVersion = JAVA_1_1; > javaVersionNumber++; > Class.forName("java.lang.ThreadLocal"); > javaVersion = JAVA_1_2; > javaVersionNumber++; > Class.forName("java.lang.StrictMath"); > javaVersion = JAVA_1_3; > javaVersionNumber++; > Class.forName("java.lang.CharSequence"); > javaVersion = JAVA_1_4; > javaVersionNumber++; > } catch (ClassNotFoundException ... > > In a certain sense, this is more reliable than > ${java.specification.version} as Ant detects what is there instead of > what the VM claims to be. > > On the other hand, it will say that Kaffee is Version 1.2, even though > it doesn't ship Swing. > > Stefan > > -- > To unsubscribe, e-mail: > <mailto:ant-user-unsubscribe@;jakarta.apache.org> > For additional commands, e-mail: > <mailto:ant-user-help@;jakarta.apache.org> > -- To unsubscribe, e-mail: <mailto:ant-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:ant-user-help@;jakarta.apache.org>
