How to dynamically compile Groovy class ?

[Vivien De Horta]

Hi.

I am J2EE developer, working on an Eclipse/Maven2 environment and I would like to use the functionnalities of Groovy to dynamically compile a Groovy class used in a Java project. My goal is to be able to modify my Groovy sources without having to relaunch the compilation each time.
Moreover, I would like to outsource my Groovy source file and load it dynamically using Java object like the groovy.lang.GroovyClassLoader (Groovy API) or similar.

I did not find any concrete solution on the web, neither on Groovy web site, that's why, I post this message.

Could anyone, experienced with the Groovy language, help me solving my problem ? Thank you in advance for your ideas.

[thomas fuller]

See the section entitled "Dynamically loading and running Groovy code inside Java":

http://docs.codehaus.org/display/GROOVY/Embedding+Groovy

Tom

On Tue, Feb 21, 2012 at 5:18 PM, Vivien De Horta <[hidden email]> wrote:

Hi.

I am J2EE developer, working on an Eclipse/Maven2 environment and I would like to use the functionnalities of Groovy to dynamically compile a Groovy class used in a Java project. My goal is to be able to modify my Groovy sources without having to relaunch the compilation each time.
Moreover, I would like to outsource my Groovy source file and load it dynamically using Java object like the groovy.lang.GroovyClassLoader (Groovy API) or similar.

I did not find any concrete solution on the web, neither on Groovy web site, that's why, I post this message.

Could anyone, experienced with the Groovy language, help me solving my problem ? Thank you in advance for your ideas.

[Andre Steingress]

Hi Viven,

another hint might be CompilerConfiguration.recompileGroovySource [0] and GroovyClassLoader.shouldRecompile [1], depending on the Groovy classes your implementation chooses to load scripts.

Cheers, André

[0] http://groovy.codehaus.org/api/org/codehaus/groovy/control/CompilerConfiguration.html
[1] http://groovy.codehaus.org/api/groovy/lang/GroovyClassLoader.html

[Vivien De Horta]

Thank you for your help.

I got no satisfying result with the GroovyClassLoader which seemed to be the most appropriate object for my problem but I am now looking for a mean to make the GroovyScriptEngine work with a Groovy class instead of a script (I have tested with a basic script and it works very well). The groovy.runtime.InvokerHelper may contains interesting methods to solve my problem.

Concerning the GroovyClassLoader, if anyone has a working source example, I would be glad to see it (I need to use the setShouldrecompile, loadClass and maybee clearCache methods).

2012/2/22 Andre Steingress <[hidden email]>

Hi Viven,

another hint might be CompilerConfiguration.recompileGroovySource [0] and
GroovyClassLoader.shouldRecompile [1], depending on the Groovy classes your
implementation chooses to load scripts.

Cheers, André

[0]
http://groovy.codehaus.org/api/org/codehaus/groovy/control/CompilerConfiguration.html
[1] http://groovy.codehaus.org/api/groovy/lang/GroovyClassLoader.html

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[Andre Steingress]

Hi Vivien,

Maybe you can come up with a code sample of what you're actually trying to achieve.

Btw, I once wrote an article on how Spring's Groovy support is implemented:
http://blog.andresteingress.com/2010/04/13/groovy-in-spring-applications/

Might be interesting to have a look at their sources (especially GroovyScriptFactory) and how Groovy class reloading is done in the Spring environment.

Cheers, André

On Wednesday, February 22, 2012 at 3:07 PM, Vivien De Horta wrote:

> Thank you for your help.
>  
> I got no satisfying result with the GroovyClassLoader which seemed to be the most appropriate object for my problem but I am now looking for a mean to make the GroovyScriptEngine work with a Groovy class instead of a script (I have tested with a basic script and it works very well). The groovy.runtime.InvokerHelper may contains interesting methods to solve my problem.
>  
> Concerning the GroovyClassLoader, if anyone has a working source example, I would be glad to see it (I need to use the setShouldrecompile, loadClass and maybee clearCache methods).
>  
>  
>  
> 2012/2/22 Andre Steingress <[e-mail] (mailto:[e-mail])>
> > Hi Viven,
> >  
> > another hint might be CompilerConfiguration.recompileGroovySource [0] and
> > GroovyClassLoader.shouldRecompile [1], depending on the Groovy classes your
> > implementation chooses to load scripts.
> >  
> > Cheers, André
> >  
> > [0]
> > http://groovy.codehaus.org/api/org/codehaus/groovy/control/CompilerConfiguration.html
> > [1] http://groovy.codehaus.org/api/groovy/lang/GroovyClassLoader.html
> >  
> > --
> > View this message in context: http://groovy.329449.n5.nabble.com/How-to-dynamically-compile-Groovy-class-tp5502842p5504393.html
> > Sent from the groovy - user mailing list archive at Nabble.com (http://Nabble.com).
> >  
> > ---------------------------------------------------------------------
> > To unsubscribe from this list, please visit:
> >  
> >    http://xircles.codehaus.org/manage_email
> >  
> >  
>  

[Vivien De Horta]

Thank yuo, I am going to read your article.

I finally succeeded in resolving my dynamic compilation challenge using the GroovyClassLoader.parseClass method.

Thank you for your help.

Vivien.

2012/2/23 Andre Steingress <[hidden email]>

Hi Vivien,

Maybe you can come up with a code sample of what you're actually trying to achieve.

Btw, I once wrote an article on how Spring's Groovy support is implemented:

http://blog.andresteingress.com/2010/04/13/groovy-in-spring-applications/

Might be interesting to have a look at their sources (especially GroovyScriptFactory) and how Groovy class reloading is done in the Spring environment.

Cheers, André

-- 

Andre Steingress

<a href="tel:%2B43%20676%209211%20322" value="[phone]" target="_blank">[phone]

http://about.me/asteingress

http://blog.andresteingress.com

http://github.com/andresteingress

On Wednesday, February 22, 2012 at 3:07 PM, Vivien De Horta wrote:

Thank you for your help.

I got no satisfying result with the GroovyClassLoader which seemed to be the most appropriate object for my problem but I am now looking for a mean to make the GroovyScriptEngine work with a Groovy class instead of a script (I have tested with a basic script and it works very well). The groovy.runtime.InvokerHelper may contains interesting methods to solve my problem.

Concerning the GroovyClassLoader, if anyone has a working source example, I would be glad to see it (I need to use the setShouldrecompile, loadClass and maybee clearCache methods).

2012/2/22 Andre Steingress <[hidden email]>

Hi Viven,

another hint might be CompilerConfiguration.recompileGroovySource [0] and
GroovyClassLoader.shouldRecompile [1], depending on the Groovy classes your
implementation chooses to load scripts.

Cheers, André

[0]
http://groovy.codehaus.org/api/org/codehaus/groovy/control/CompilerConfiguration.html
[1] http://groovy.codehaus.org/api/groovy/lang/GroovyClassLoader.html

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