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From Fintan Hynes <>
Subject RE: Compiler Attribute
Date Wed, 24 Nov 2004 18:02:41 GMT

Hi John,

We do something roughly similiar to this.  We sometimes compile our client
and server components using a different Java version

1.  No, you shouldn't need different classpaths.  We have no compiler jars
in the classpath when invoking the <javac> task.

2.  I could never get the compiler attribute to work correctly. so our
compile target uses a property to point to the compiler executable location.

So our compile targets look like this:

	<!-- Compile the java classes using javac 1.3 on Windows -->
	<target name="compileNTServer" 
		  description="* Compile the java classes using javac 1.3 on
Win" if="ENV.windir">
		<echo message="-> [project buildIncludes] - [target
		<javac srcdir="${srcpath}" destdir="${classes}"
executable="${nt.server.compiler.loc}/bin/javac" fork="yes"/>
	<!-- Compile the java classes using javac 1.4 on WinNT -->
	<target name="compileNTClient" 
		  description="* Compile the java classes using javac 1.4 on
Win" if="ENV.windir">
		<echo message="-> [project buildIncludes] - [target
		<javac srcdir="${srcpath}" destdir="${classes}"
executable="${nt.client.compiler.loc}/bin/javac" fork="yes"/>

you could have

	<target name="compile">
		<javac srcdir="${srcpath}" destdir="${classes}"
executable="${compiler.loc}/bin/javac" fork="yes"/>

With ${compiler.loc} set depending on the previous targets..

To get this working I needed to set fork to "true".  

Anyone know a better solution than this?
-----Original Message-----
From: Longie []
Sent: 24 November 2004 17:47
Subject: Compiler Attribute


I have different versions of java installed on a winxp machine. I need
to be able to run ant depending on the compiler which is chosen by the
user either via the program or at runtime via a command line argument.
If none is specified then use hte default java classpath.


1) Do i need to set different classpaths for each of the java versions
installed and then set the compiler attribute

2) Is the compiler attribute set in 

<javac srcdir="${src-dir}" destdir="${obj-dir}" debug="on"
deprecation="on" commpiler="something"/>

I have been testing with classloaders but i will be wrapping  GUI around
Ant and i want to be able to give the user an option to use different
java versions so Ant is the better option.

Any help is appreciated.



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