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From Christopher Schultz <>
Subject Re: Ant Tasks Question
Date Tue, 03 Apr 2012 14:03:14 GMT
Hash: SHA1


On 4/2/12 5:43 PM, Nick Williams wrote:
> As for the ant-i-fication of the JspC compiler, I, too get the
> impression that it was rather an afterthought. However, it is not
> necessary or even that common for tasks to be called *Task, as
> Konstantin pointed out. Most of them /aren't/ named *Task.

I was mostly gathering corroborating evidence to suggest that JspC
being an Ant task was not its original intent: it's mostly geared
towards being a CLI tool and has some support for Ant slapped-onto it.
I'm not sure why Konstantin got so agitated about my comments about
the class name: it's obviously the least significant part of my argument.

> I'm aware that I can translate and compile as separate tasks, but
> that's not what I was looking for. I actually DO want to translate
> and compile with the same task, because I want the Eclipse compiler
> shipped with Tomcat to be used for compiling the JSPs.

Well, you can already do that from within JspC (though the CLI doesn't
actually use it) by setting "compiler" to either
"org.apache.jasper.compiler.JDTCompiler" or
"org.apache.jasper.compiler.AntCompiler" (or really anything that
implements org.apache.jasper.compiler.Compiler). The default is to use
the JDTCompiler when the translate and compile steps are performed
together. I have no idea how to invoke the JDT compiler from the
command-line given just the .jar file that contains it: I suspect
you'd be able to poke-around and figure out how to do that as a
separate Ant task, which might give you more flexibility.

> But your comment helps me out in expressing my desire: I feel like
> it should be able to fork and use whatever JVM I specify for
> executing the JspC task, whether I'm using JspC for translation
> and compilation or just translation.

Fair enough. Just because I'm curious: why do you care which JVM is
being used for the translation step?

> I agree that fork support should be expected of a nice player in
> the Ant ecosystem.

I'll have to read the code for some of the built-in Ant tasks to see
how that's traditionally done. It might make sense for the Jasper and
task to become a separate class from JspC, even if it heavily utilizes
JspC itself. Ideally, JspC would be "merely" the CLI wrapper around a
Compiler and a separate class would handle the Ant-related stuff. I
would even buy a common superclass for the two, but it's often tough
to tell what is there to support Ant and what isn't.

> Maybe what we really need, instead of attempting to retrofit JspC
> to be more Task-y, is add a new Task to o.a.catalina.ant
> (JasperTask? JspCompileTask?) and trying to follow some better
> practices with the new practice. What are the community thoughts on
> this? I can see both upsides and downsides to doing this.

Heh. I should have read this first. I obviously agree.

> I'll file enhancement requests in Bugzilla later today or tomorrow
> for the namespace and forking issues.

I'll look for those.

- -chris
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