compiler option gets recognized as argument

[brettvormkopp]

after installing maven 2.2.1 and revisiting an old project of mine i
stubled upon some strange(?) behaviour which i "verified" using the
following example:

package de.thanith

object Test {
def main(args: Array[String]) {
args.foreach(println)
}
}

my pom.xml configures the plugin to enable continuations (which are
needed by other sources in my project):

<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<scalaVersion>${scala.version}</scalaVersion>
<args>
<arg>-P:continuations:enable</arg>
</args>
<compilerPlugins>
<compilerPlugin>
<groupId>org.scala-lang.plugins</groupId>
<artifactId>continuations</artifactId>
<version>${scala.version}</version>
</compilerPlugin>
</compilerPlugins>
</configuration>
</plugin>

now the execution of the run goal yields the following output:

C:\Users\wotan\IdeaProjects\Default\ScalaWorkspace>mvn -DaddArgs=17 -
DmainClass=de.thanith.Test -f C:\Users\wotan\IdeaProjects\Default
\ScalaWorkspace\pom.xml org.scala-to
ols:maven-scala-plugin:2.15.0:run
[INFO] Scanning for projects...
[INFO]
------------------------------------------------------------------------
[INFO] Building Unnamed - ScalaWorkspace:ScalaWorkspace:jar:1.0
[INFO] task-segment: [org.scala-tools:maven-scala-plugin:
2.15.0:run]
[INFO]
------------------------------------------------------------------------
[INFO] Preparing scala:run
[INFO] [resources:resources {execution: default-resources}]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered
resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\wotan\IdeaProjects
\Default\ScalaWorkspace\src\main\resources
[INFO] [compiler:compile {execution: default-compile}]
[INFO] Nothing to compile - all classes are up to date
[INFO] [scala:compile {execution: default}]
[INFO] Checking for multiple versions of scala
[INFO] includes = [**/*.scala,**/*.java,]
[INFO] excludes = []
[INFO] Nothing to compile - all classes are up to date
[INFO] [resources:testResources {execution: default-testResources}]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered
resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\wotan\IdeaProjects
\Default\ScalaWorkspace\src\test\resources
[INFO] [compiler:testCompile {execution: default-testCompile}]
[INFO] Nothing to compile - all classes are up to date
[INFO] [scala:testCompile {execution: default}]
[INFO] Checking for multiple versions of scala
[INFO] includes = [**/*.scala,**/*.java,]
[INFO] excludes = []
[INFO] Nothing to compile - all classes are up to date
[INFO] [scala:run {execution: default-cli}]
[INFO] Checking for multiple versions of scala
-P:continuations:enable
17
[INFO]
------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO]
------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Sat Dec 25 12:59:14 CET 2010
[INFO] Final Memory: 35M/344M
[INFO]
------------------------------------------------------------------------

so "-P:continuations:enable" gets recognized as an argument but it
should not, at least in my opinion.

what am i missing here?

rgds
toni

[David Bernard]

Hi,

Configuration defined at top level plugin (directly under <plugin>) are shared by every plugin's goals (so by scala:run, scala:cc, scala:compile, scala:testCompile... in your case).

2 solutions :

* try to move your configuration node under <execution>, then the configuration will be shared only by compile and testCompile.

* use launcher, then scala:run will use specific configuration defined by launcher section see http://scala-tools.org/mvnsites/maven-scala-plugin/example_run.html

/davidB

[brettvormkopp]

Hi,

i modified the plugin configuration to follow your first suggestion:

<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>

<configuration>
<scalaVersion>${scala.version}</scalaVersion>
<args>
<arg>-P:continuations:enable</arg>
</args>
<compilerPlugins>
<compilerPlugin>
<groupId>org.scala-lang.plugins</groupId>
<artifactId>continuations</artifactId>
<version>${scala.version}</version>
</compilerPlugin>
</compilerPlugins>
</configuration>

</execution>
</executions>
</plugin>

compilation of the project proved successful and the compiler option
is no longer recognized as an argument, but now the execution of
scala:run on a main class that needs continuations yields:

Exception in thread "main" java.lang.NoSuchMethodError:
scala.util.continuations.package$.shift(Lscala/Function1;)Ljava/lang/
Object;
at de.thanith.scala.Typesafe$.format(Typesafe.scala:18)
at de.thanith.scala.Typesafe$$anonfun$4.apply(Typesafe.scala:24)
at de.thanith.scala.Typesafe$$anonfun$4.apply(Typesafe.scala:24)
at scala.util.continuations.package$.reset(package.scala:20)
at de.thanith.scala.Typesafe$.sprintf(Typesafe.scala:22)
at de.thanith.scala.Typesafe$.<init>(Typesafe.scala:24)
at de.thanith.scala.Typesafe$.<clinit>(Typesafe.scala)
at de.thanith.scala.Typesafe.main(Typesafe.scala)

Btw. i am duing this in order to use Intelij IDEA's Run/Debug
configurations to specify addArgs parameters (thats the reason i did
not use launchers :).

Any hints, ideas how i can adjust pom.xml to use the continuations
plugin and be able to specify addArgs?

thx and rgds
toni

On 26 Dez., 14:53, David Bernard <david.bernard...@gmail.com> wrote:
> Hi,
>
> Configuration defined at top level plugin (directly under <plugin>) are
> shared by every plugin's goals (so by scala:run, scala:cc, scala:compile,
> scala:testCompile... in your case).
> 2 solutions :
> * try to move your configuration node under <execution>, then the
> configuration will be shared only by compile and testCompile.
> * use launcher, then scala:run will use specific configuration defined by

> launcher section seehttp://scala-tools.org/mvnsites/maven-scala-plugin/example_run.html
>
> /davidB

[brettvormkopp]

On 26 Dez., 14:53, David Bernard <david.bernard...@gmail.com> wrote:

> Hi,
>
> Configuration defined at top level plugin (directly under <plugin>) are
> shared by every plugin's goals (so by scala:run, scala:cc, scala:compile,
> scala:testCompile... in your case).
> 2 solutions :
> * try to move your configuration node under <execution>, then the
> configuration will be shared only by compile and testCompile.
> * use launcher, then scala:run will use specific configuration defined by

> launcher section seehttp://scala-tools.org/mvnsites/maven-scala-plugin/example_run.html
>
> /davidB

[Josh Suereth]

If it can't find the continuations library, than the scala-library is somehow not on your path.  All scala.util.continuations code is located in the scala-library.
  What does your POM look like for scala:run?

thanks

- josh

[brettvormkopp]

my POM looks as given below (it is pretty much was comes with the
artifact, i just enabled continuations and the maven-scalatest
plugin).

(Btw. all the classes which do not need continuations execute without
problems.)

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://
www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>ScalaWorkspace</groupId>
<artifactId>ScalaWorkspace</artifactId>
<version>1.0</version>
<inceptionYear>2008</inceptionYear>
<properties>
<scala.version>2.8.1</scala.version>
</properties>

<repositories>
<repository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>

<pluginRepositories>
<pluginRepository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>

<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest</artifactId>
<version>1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>

<pluginManagement>
<plugins>
<plugin>
<groupId>com.jteigen</groupId>
<artifactId>maven-scalatest-plugin</artifactId>
<version>1.1-SNAPSHOT</version>
</plugin>
</plugins>
</pluginManagement>

<plugins>

<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>

<args>
<arg>-P:continuations:enable</arg>
</args>
<compilerPlugins>
<compilerPlugin>
<groupId>org.scala-lang.plugins</groupId>
<artifactId>continuations</artifactId>
<version>${scala.version}</version>
</compilerPlugin>
</compilerPlugins>
</configuration>
</execution>
</executions>
<configuration>
<scalaVersion>${scala.version}</scalaVersion>

</configuration>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<configuration>
<downloadSources>true</downloadSources>
<buildcommands>
<buildcommand>ch.epfl.lamp.sdt.core.scalabuilder</
buildcommand>
</buildcommands>
<additionalProjectnatures>
<projectnature>ch.epfl.lamp.sdt.core.scalanature</
projectnature>
</additionalProjectnatures>
<classpathContainers>

<classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</
classpathContainer>

<classpathContainer>ch.epfl.lamp.sdt.launching.SCALA_CONTAINER</
classpathContainer>
</classpathContainers>
</configuration>
</plugin>

<plugin>
<groupId>com.jteigen</groupId>
<artifactId>maven-scalatest-plugin</artifactId>
<version>1.1-SNAPSHOT</version>
</plugin>
</plugins>
</build>

<reporting>
<plugins>

<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>

<configuration>
<scalaVersion>${scala.version}</scalaVersion>

</configuration>
</plugin>
</plugins>
</reporting>
</project>


rgds
toni

On 28 Dez., 16:20, Josh Suereth <joshua.suer...@gmail.com> wrote:
> If it can't find the continuations library, than the scala-library is
> somehow not on your path.  All scala.util.continuations code is located in
> the scala-library.
>   What does your POM look like for scala:run?
>
> thanks
>
> - josh
>

[Josh Suereth]

your code is *not* being compiled with the continuations plugin enabled.

See shift's implementation:  http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/continuations/library/scala/util/continuations/package.scala

Set the displayCmd option to true and let's see what your command line argument is.  My guess is that your configuration does not bind the goals to a phase and is therefore not being used in the default lifecycle.   Only a guess though.

- Josh

[David Bernard]

try to remove configuration under plugin, because :

* I'm not sur maven (every version) merge configuration for plugin with configuration from execution

* it's useless, maven-scala-plugin detecte the version from scala-library or the property scala.version (use of configuration is only for some case like packaging == pom)

good pratice : set the version of the maven-scala-plugin (eg : 2.15.0)

* to have a reproductible build (in time, in environment)

* to follow maven 3 advice

/davidB