Gant scripts, java task and nested classpath element

[Daniel Henrique Alves Lima]

    Hi.

    I've written a comment about this newbie mistake/gotcha (???):
http://techdm.com/grails/?p=585&lang=en (item 3)
    Now I'm trying to understand if this is a bug or a limitation and
who I should blame: Gant, Grails or myself (for my lack of knowledge) :-)

// TestJava.groovy
    println 'classpath ' + classpath
// (...)
    //ant.path(id: 'defClasspath', { pathelement(location:
"${dir}/def.jar" )})

    ant.java(classname: 'def.Def', fork: true, dir: dir/*,
classpathref:'defClasspath'*/) {
        classpath {
            pathelement(location: "${dir}/def.jar")
        }
    }

    classpath seems a closure (println is outputing "classpath
org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16@5baa8241")
    So I can write anything inside the nested classpath and ant.java
task just fails because def.jar was not added to the classpath.

    Of course, If i use classpathref instead, everything works as
expected. It also works using ant.classpath or ant.java(classpath: ).

http://ant.apache.org/manual/Tasks/java.html

    Thanks in advance.

          Best regards,

                Daniel.

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[Russel Winder]

Daniel,

I am not totally sure how to quickly construct a small example of a Gant
script that exhibits the problem behaviour you are finding.  I have not
seen an example of a nested classpath failing in a Gant script, so my
initial hypothesis is that the problem is not with Gant per se.

Basically, If I create

+build.gant
+Material
| + def.jar

and extract the build script to be:

        import org.codehaus.gant.GantState
        target(main: "The description of the script goes here!") {
            def dir = new File('Material')
            GantState.verbosity = GantState.VERBOSE
            ant.logger.setMessageOutputLevel(GantState.verbosity)
            ant.java(classname: 'def.Def', fork: true, dir: dir) {
                classpath {
                    pathelement(location: "${dir}/def.jar")
                }
            }
        }
        setDefaultTarget(main)

Then I get:

        > gant
        main:
             [java] Executing '/usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/java' with arguments:
             [java] '-classpath'
             [java] '/home/users/russel/Progs/OddsByLanguage/Gant/DanielHenriqueAlvesLima_2011-08-11/Material/def.jar'
             [java] 'def.Def'
             [java]
             [java] The ' characters around the executable and arguments are
             [java] not part of the command.
             [java] def
        ------ main
       
        BUILD SUCCESSFUL
        Total time: 1.80 seconds




On Wed, 2011-08-10 at 18:44 -0300, Daniel Henrique Alves Lima wrote:

> Hi.
>
>     I've written a comment about this newbie mistake/gotcha (???):
> http://techdm.com/grails/?p=585&lang=en (item 3)
>     Now I'm trying to understand if this is a bug or a limitation and
> who I should blame: Gant, Grails or myself (for my lack of knowledge) :-)
>
> // TestJava.groovy
>     println 'classpath ' + classpath
> // (...)
>     //ant.path(id: 'defClasspath', { pathelement(location:
> "${dir}/def.jar" )})
>
>     ant.java(classname: 'def.Def', fork: true, dir: dir/*,
> classpathref:'defClasspath'*/) {
>         classpath {
>             pathelement(location: "${dir}/def.jar")
>         }
>     }
>
>     classpath seems a closure (println is outputing "classpath
> org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16@5baa8241")
>     So I can write anything inside the nested classpath and ant.java
> task just fails because def.jar was not added to the classpath.
>
>     Of course, If i use classpathref instead, everything works as
> expected. It also works using ant.classpath or ant.java(classpath: ).
>
> http://ant.apache.org/manual/Tasks/java.html
>
>     Thanks in advance.
>
>           Best regards,
>
>                 Daniel.
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
>     http://xircles.codehaus.org/manage_email

--
Russel.
=============================================================================
Dr Russel Winder      t: [phone]   voip: sip:[hidden email]
41 Buckmaster Road    m: [phone]   xmpp: [hidden email]
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder

[Daniel Henrique Alves Lima]

    Hi Russel. Thanks for your answers.
    I think the problem is the "classpath" closure defined somewhere in
Grails. Try this in your pure Gant script:

        import org.codehaus.gant.GantState
        target(main: "The description of the script goes here!") {
            classpath = {}
            def dir = new File('Material')
            GantState.verbosity = GantState.VERBOSE
            ant.logger.setMessageOutputLevel(GantState.verbosity)
            ant.java(classname: 'def.Def', fork: true, dir: dir) {
                classpath {
                    pathelement(location: "${dir}/def.jar")
                }
            }
        }
        setDefaultTarget(main)

 
    You will probably get:

     [java] Executing '/usr/local/jdk1.6.0_23/jre/bin/java' with arguments:
     [java] 'def.Def'
     [java]
     [java] The ' characters around the executable and arguments are
     [java] not part of the command.
     [java] Exception in thread "main" java.lang.NoClassDefFoundError:
def/Def
     [java] Caused by: java.lang.ClassNotFoundException: def.Def
     [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     [java]     at java.security.AccessController.doPrivileged(Native
Method)
     [java]     at
java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     [java]     at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
     [java] Could not find the main class: def.Def.  Program will exit.
     [java] Java Result: 1


    If I set the classpath to null (in the Gant script inside my Grails
project), before calling ant.java, everything works fine.

    Thanks in advance.

          Best regards,

             Daniel.
   

Russel Winder wrote:

> Daniel,
>
> I am not totally sure how to quickly construct a small example of a Gant
> script that exhibits the problem behaviour you are finding.  I have not
> seen an example of a nested classpath failing in a Gant script, so my
> initial hypothesis is that the problem is not with Gant per se.
>
> Basically, If I create
>
> +build.gant
> +Material
> | + def.jar
>
> and extract the build script to be:
>
>         import org.codehaus.gant.GantState
>         target(main: "The description of the script goes here!") {
>             def dir = new File('Material')
>             GantState.verbosity = GantState.VERBOSE
>             ant.logger.setMessageOutputLevel(GantState.verbosity)
>             ant.java(classname: 'def.Def', fork: true, dir: dir) {
>                 classpath {
>                     pathelement(location: "${dir}/def.jar")
>                 }
>             }
>         }
>         setDefaultTarget(main)
>
> Then I get:
>
>         > gant
>         main:
>              [java] Executing '/usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/java' with arguments:
>              [java] '-classpath'
>              [java] '/home/users/russel/Progs/OddsByLanguage/Gant/DanielHenriqueAlvesLima_2011-08-11/Material/def.jar'
>              [java] 'def.Def'
>              [java]
>              [java] The ' characters around the executable and arguments are
>              [java] not part of the command.
>              [java] def
>         ------ main
>        
>         BUILD SUCCESSFUL
>         Total time: 1.80 seconds
>
>
>
>
> On Wed, 2011-08-10 at 18:44 -0300, Daniel Henrique Alves Lima wrote:
>  
>> Hi.
>>
>>     I've written a comment about this newbie mistake/gotcha (???):
>> http://techdm.com/grails/?p=585&lang=en (item 3)
>>     Now I'm trying to understand if this is a bug or a limitation and
>> who I should blame: Gant, Grails or myself (for my lack of knowledge) :-)
>>
>> // TestJava.groovy
>>     println 'classpath ' + classpath
>> // (...)
>>     //ant.path(id: 'defClasspath', { pathelement(location:
>> "${dir}/def.jar" )})
>>
>>     ant.java(classname: 'def.Def', fork: true, dir: dir/*,
>> classpathref:'defClasspath'*/) {
>>         classpath {
>>             pathelement(location: "${dir}/def.jar")
>>         }
>>     }
>>
>>     classpath seems a closure (println is outputing "classpath
>> org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16@5baa8241")
>>     So I can write anything inside the nested classpath and ant.java
>> task just fails because def.jar was not added to the classpath.
>>
>>     Of course, If i use classpathref instead, everything works as
>> expected. It also works using ant.classpath or ant.java(classpath: ).
>>
>> http://ant.apache.org/manual/Tasks/java.html
>>
>>     Thanks in advance.
>>
>>           Best regards,
>>
>>                 Daniel.
>>    
>

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[Russel Winder]

On Thu, 2011-08-11 at 00:14 -0300, Daniel Henrique Alves Lima wrote:

> Hi Russel. Thanks for your answers.
>     I think the problem is the "classpath" closure defined somewhere in
> Grails. Try this in your pure Gant script:
>
>         import org.codehaus.gant.GantState
>         target(main: "The description of the script goes here!") {
>             classpath = {}
>             def dir = new File('Material')
>             GantState.verbosity = GantState.VERBOSE
>             ant.logger.setMessageOutputLevel(GantState.verbosity)
>             ant.java(classname: 'def.Def', fork: true, dir: dir) {
>                 classpath {
>                     pathelement(location: "${dir}/def.jar")
>                 }
>             }
>         }
>         setDefaultTarget(main)
>
>  
>     You will probably get:

I did indeed :-)

But that is to be expected due to Groovy symbol look up and the way in
which builders are realized using the Groovy meta-object protocol.   The
meaning of classpath as a builder constructor only works so long as
there is no definition of the symbol classpath earlier in the lookup
than the meta-object protocol trigger that realizes the builder.

Looking at that last sentence I know what I mean, but I am not sure it
will transfer that meaning to you.  Rather than go into some long
ramble, I'll await a DoNotUnderstand exception.

The summary is that this may turn out to be a very deep (but not
necessarily meaningful :-) issue to put right, involving Grails, Gant,
and the Groovy AntBuilder.

>
>      [java] Executing '/usr/local/jdk1.6.0_23/jre/bin/java' with arguments:
>      [java] 'def.Def'
>      [java]
>      [java] The ' characters around the executable and arguments are
>      [java] not part of the command.
>      [java] Exception in thread "main" java.lang.NoClassDefFoundError:
> def/Def
>      [java] Caused by: java.lang.ClassNotFoundException: def.Def
>      [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>      [java]     at java.security.AccessController.doPrivileged(Native
> Method)
>      [java]     at
> java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>      [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>      [java]     at
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>      [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>      [java] Could not find the main class: def.Def.  Program will exit.
>      [java] Java Result: 1

--
Russel.
=============================================================================
Dr Russel Winder      t: [phone]   voip: sip:[hidden email]
41 Buckmaster Road    m: [phone]   xmpp: [hidden email]
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder

[Daniel Henrique Alves Lima]

    And another way of reproducing the issue:

       import org.codehaus.gant.GantState

       target(name: 'classpath') {
           println 'Executing this target'
      }

       target(main: "The description of the script goes here!") {
           def dir = new File('Material')
           GantState.verbosity = GantState.VERBOSE
           ant.logger.setMessageOutputLevel(GantState.verbosity)
           ant.java(classname: 'def.Def', fork: true, dir: dir) {
               classpath {
                   pathelement(location: "${dir}/def.jar")
               }
           }
       }
       setDefaultTarget(main)

===
Executing this target
     [java] Executing '/usr/local/jdk1.6.0_23/jre/bin/java' with arguments:
     [java] 'def.Def'
     [java]
     [java] The ' characters around the executable and arguments are
     [java] not part of the command.
     [java] Exception in thread "main" java.lang.NoClassDefFoundError:
def/Def
     [java] Caused by: java.lang.ClassNotFoundException: def.Def
     [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
     [java]     at java.security.AccessController.doPrivileged(Native
Method)
     [java]     at
java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     [java]     at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
     [java] Could not find the main class: def.Def.  Program will exit.
     [java] Java Result: 1
===

    BTW, _GrailsClasspath.groovy has a target named as classpath.

    So
                classpath {
                   pathelement(location: "${dir}/def.jar")
               }

    Is invoking the 'classpath' closure (or target) passing another
closure as argument.
    So basically any nested element can be shadowed, right? Is this a
Groovy Builder thing and/or a desired/intentional feature?


    Thanks in advance.

          Best regards,

                Daniel.

Daniel Henrique Alves Lima wrote:

>    Hi Russel. Thanks for your answers.
>    I think the problem is the "classpath" closure defined somewhere in
> Grails. Try this in your pure Gant script:
>
>        import org.codehaus.gant.GantState
>        target(main: "The description of the script goes here!") {
>            classpath = {}
>            def dir = new File('Material')
>            GantState.verbosity = GantState.VERBOSE
>            ant.logger.setMessageOutputLevel(GantState.verbosity)
>            ant.java(classname: 'def.Def', fork: true, dir: dir) {
>                classpath {
>                    pathelement(location: "${dir}/def.jar")
>                }
>            }
>        }
>        setDefaultTarget(main)
>
>  
>    You will probably get:
>
>     [java] Executing '/usr/local/jdk1.6.0_23/jre/bin/java' with
> arguments:
>     [java] 'def.Def'
>     [java]
>     [java] The ' characters around the executable and arguments are
>     [java] not part of the command.
>     [java] Exception in thread "main" java.lang.NoClassDefFoundError:
> def/Def
>     [java] Caused by: java.lang.ClassNotFoundException: def.Def
>     [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>     [java]     at java.security.AccessController.doPrivileged(Native
> Method)
>     [java]     at
> java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>     [java]     at
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>     [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>     [java] Could not find the main class: def.Def.  Program will exit.
>     [java] Java Result: 1
>
>
>    If I set the classpath to null (in the Gant script inside my Grails
> project), before calling ant.java, everything works fine.
>
>    Thanks in advance.
>
>          Best regards,
>
>             Daniel.
>  
> Russel Winder wrote:
>> Daniel,
>>
>> I am not totally sure how to quickly construct a small example of a Gant
>> script that exhibits the problem behaviour you are finding.  I have not
>> seen an example of a nested classpath failing in a Gant script, so my
>> initial hypothesis is that the problem is not with Gant per se.
>>
>> Basically, If I create
>>
>> +build.gant
>> +Material
>> |    + def.jar
>>
>> and extract the build script to be:
>>
>>         import org.codehaus.gant.GantState
>>         target(main: "The description of the script goes here!") {
>>             def dir = new File('Material')
>>             GantState.verbosity = GantState.VERBOSE
>>             ant.logger.setMessageOutputLevel(GantState.verbosity)
>>             ant.java(classname: 'def.Def', fork: true, dir: dir) {
>>                 classpath {
>>                     pathelement(location: "${dir}/def.jar")
>>                 }
>>             }
>>         }
>>         setDefaultTarget(main)
>>
>> Then I get:
>>
>>         > gant
>>         main:
>>              [java] Executing
>> '/usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/java' with arguments:
>>              [java] '-classpath'
>>              [java]
>> '/home/users/russel/Progs/OddsByLanguage/Gant/DanielHenriqueAlvesLima_2011-08-11/Material/def.jar'
>>
>>              [java] 'def.Def'
>>              [java]              [java] The ' characters around the
>> executable and arguments are
>>              [java] not part of the command.
>>              [java] def
>>         ------ main
>>                 BUILD SUCCESSFUL
>>         Total time: 1.80 seconds
>>

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[Daniel Henrique Alves Lima]

    Ignore my last message. I've sent it before reading your message :-)

    Thanks.

Russel Winder wrote:

> On Thu, 2011-08-11 at 00:14 -0300, Daniel Henrique Alves Lima wrote:
>  
>> Hi Russel. Thanks for your answers.
>>     I think the problem is the "classpath" closure defined somewhere in
>> Grails. Try this in your pure Gant script:
>>
>>         import org.codehaus.gant.GantState
>>         target(main: "The description of the script goes here!") {
>>             classpath = {}
>>             def dir = new File('Material')
>>             GantState.verbosity = GantState.VERBOSE
>>             ant.logger.setMessageOutputLevel(GantState.verbosity)
>>             ant.java(classname: 'def.Def', fork: true, dir: dir) {
>>                 classpath {
>>                     pathelement(location: "${dir}/def.jar")
>>                 }
>>             }
>>         }
>>         setDefaultTarget(main)
>>
>>  
>>     You will probably get:
>>    
>
> I did indeed :-)
>
> But that is to be expected due to Groovy symbol look up and the way in
> which builders are realized using the Groovy meta-object protocol.   The
> meaning of classpath as a builder constructor only works so long as
> there is no definition of the symbol classpath earlier in the lookup
> than the meta-object protocol trigger that realizes the builder.
>
> Looking at that last sentence I know what I mean, but I am not sure it
> will transfer that meaning to you.  Rather than go into some long
> ramble, I'll await a DoNotUnderstand exception.
>
> The summary is that this may turn out to be a very deep (but not
> necessarily meaningful :-) issue to put right, involving Grails, Gant,
> and the Groovy AntBuilder.
>
>  
>>      [java] Executing '/usr/local/jdk1.6.0_23/jre/bin/java' with arguments:
>>      [java] 'def.Def'
>>      [java]
>>      [java] The ' characters around the executable and arguments are
>>      [java] not part of the command.
>>      [java] Exception in thread "main" java.lang.NoClassDefFoundError:
>> def/Def
>>      [java] Caused by: java.lang.ClassNotFoundException: def.Def
>>      [java]     at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>>      [java]     at java.security.AccessController.doPrivileged(Native
>> Method)
>>      [java]     at
>> java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>>      [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>>      [java]     at
>> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>>      [java]     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>>      [java] Could not find the main class: def.Def.  Program will exit.
>>      [java] Java Result: 1
>>    
>
>  

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[Jochen Theodorou]

Am 11.08.2011 05:57, schrieb Daniel Henrique Alves Lima:

> And another way of reproducing the issue:
>
> import org.codehaus.gant.GantState
>
> target(name: 'classpath') {
> println 'Executing this target'
> }
>
> target(main: "The description of the script goes here!") {
> def dir = new File('Material')
> GantState.verbosity = GantState.VERBOSE
> ant.logger.setMessageOutputLevel(GantState.verbosity)
> ant.java(classname: 'def.Def', fork: true, dir: dir) {
> classpath {
> pathelement(location: "${dir}/def.jar")
> }
> }
> }
> setDefaultTarget(main)

[...]

how about replacing "classapth{" with "ant.classpath{" ?

bye blackdrag


--
Jochen "blackdrag" Theodorou
The Groovy Project Tech Lead
http://blackdragsview.blogspot.com/
For Groovy programming sources visit http://groovy.codehaus.org


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[Daniel Henrique Alves Lima]

    Hi Jochen.

    I think you have missed this part of my explanation:

>     classpath seems a closure (println is outputing "classpath
> org.codehaus.gant.GantBinding$_initializeGantBinding_closure5_closure16@5baa8241")
>     So I can write anything inside the nested classpath and ant.java
> task just fails because def.jar was not added to the classpath.
>
>     Of course, If i use classpathref instead, everything works as
> expected. It also works using ant.classpath or ant.java(classpath: ).
>

    So it does work using classpathref, ant.classpath or
ant.java(classpath:). I'm now aware this behavior isn't bug, but we must
agree it may be very trick (for newcomers?) :-)

    Thanks.

    Best regards,

          Daniel.

Jochen Theodorou wrote:

> Am 11.08.2011 05:57, schrieb Daniel Henrique Alves Lima:
>> And another way of reproducing the issue:
>>
>> import org.codehaus.gant.GantState
>>
>> target(name: 'classpath') {
>> println 'Executing this target'
>> }
>>
>> target(main: "The description of the script goes here!") {
>> def dir = new File('Material')
>> GantState.verbosity = GantState.VERBOSE
>> ant.logger.setMessageOutputLevel(GantState.verbosity)
>> ant.java(classname: 'def.Def', fork: true, dir: dir) {
>> classpath {
>> pathelement(location: "${dir}/def.jar")
>> }
>> }
>> }
>> setDefaultTarget(main)
> [...]
>
> how about replacing "classapth{" with "ant.classpath{" ?
>
> bye blackdrag
>
>

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[Daniel Henrique Alves Lima]

http://jira.grails.org/browse/GRAILS-7879

Thanks.


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