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From Gilles Sadowski <gil...@harfang.homelinux.org>
Subject Re: [Math] How to select a specific JDK ?
Date Wed, 13 Jun 2012 12:43:58 GMT
Hello.

> 
> With maven, you can configure the compiler to compile in the version you
> want.
> 
> Add this to the pom.xml and set the arguments as you which.
> 
> <build>
>         <pluginManagement>
>                 <plugin>
>                     <groupId>org.apache.maven.plugins</groupId>
>                     <artifactId>maven-compiler-plugin</artifactId>
>                     <version>2.4</version>
>                     <configuration>
>                         <encoding>UTF-8</encoding>
>                         <source>1.6</source>
>                         <target>1.6</target>
>                         <compilerArguments>
>                             <Xlint:-unchecked />
>                         </compilerArguments>
>                     </configuration>
>                 </plugin>
> 
> See http://maven.apache.org/plugins/maven-compiler-plugin/ for more
> informations.

I had seen that, but that cannot be the whole story (unless there is some
maven magic involved); indeed, how can maven differentiate
  java-6-openjdk-amd64
from
  java-6-sun
(since both are Java 1.6)?

I was thinking that there should be some environment variable(s) whose
setting would somehow activate the above configuration.


Regards,
Gilles

> 
> 
> 2012/6/13 Gilles Sadowski <gilles@harfang.homelinux.org>
> 
> > On Wed, Jun 13, 2012 at 12:48:31PM +0200, Jochen Wiedmann wrote:
> > > Yes, that switch is called PATH (environment variable).
> >
> > Do you mean that I should change the PATH variable just to build Commons
> > Math?
> > I surely hope that there is a more flexible way.
> >
> > With "ant", all that's needed is to define JAVA_HOME (another environment
> > variable, but specific to the task at hand).
> >
> > > On Wed, Jun 13, 2012 at 12:19 PM, Gilles Sadowski
> > > <gilles@harfang.homelinux.org> wrote:
> > > > Hello.
> > > >
> > > > Are there command-line switches that will select a specific JDK?
> > > > I.e. I have several of them installed:
> > > >
> > > > $ ls -l /usr/lib/jvm
> > > > total 36
> > > > lrwxrwxrwx  1 root root   24 Dec 17 11:04 default-java ->
> > java-1.6.0-openjdk-amd64
> > > > lrwxrwxrwx  1 root root   18 Jan  5 18:27 java-1.5.0-gcj ->
> > java-1.5.0-gcj-4.6
> > > > drwxr-xr-x  6 root root 4096 Jan 18 15:04 java-1.5.0-gcj-4.4
> > > > drwxr-xr-x  6 root root 4096 Mar  7 17:33 java-1.5.0-gcj-4.6
> > > > lrwxrwxrwx  1 root root   23 Aug 11  2010 java-1.5.0-sun ->
> > java-1.5.0-sun-1.5.0.22
> > > > drwxr-xr-x 10 root root 4096 Aug 11  2010 java-1.5.0-sun-1.5.0.22
> > > > lrwxrwxrwx  1 root root   20 Dec 16 18:51 java-1.6.0-openjdk-amd64 ->
> > java-6-openjdk-amd64
> > > > lrwxrwxrwx  1 root root   20 May  3 14:00 java-1.7.0-openjdk-amd64 ->
> > java-7-openjdk-amd64
> > > > drwxr-xr-x  3 root root 4096 Jan 18 15:38 java-6-openjdk
> > > > drwxr-xr-x  7 root root 4096 Mar  7 17:29 java-6-openjdk-amd64
> > > > drwxr-xr-x  3 root root 4096 Jan 18 15:38 java-6-openjdk-common
> > > > lrwxrwxrwx  1 root root   19 Jun  9  2011 java-6-sun ->
> > java-6-sun-1.6.0.26
> > > > drwxr-xr-x  8 root root 4096 Jan 18 15:47 java-6-sun-1.6.0.26
> > > > drwxr-xr-x  7 root root 4096 Jun  5 17:12 java-7-openjdk-amd64
> > > > drwxr-xr-x  3 root root 4096 Jun  5 17:12 java-7-openjdk-common
> > > > lrwxrwxrwx  1 root root   12 Jan  5 18:27 java-gcj -> java-gcj-4.6
> > > > lrwxrwxrwx  1 root root   18 Apr 29  2010 java-gcj-4.4 ->
> > java-1.5.0-gcj-4.4
> > > > lrwxrwxrwx  1 root root   18 Nov 14  2011 java-gcj-4.6 ->
> > java-1.5.0-gcj-4.6
> > > >
> > > > and I'd like to be able to say something like
> > > >  -D...=/usr/lib/jvm/java-7-openjdk-amd64
> > > > so that maven will use the corresponding compiler and JVM.
> > > >
> > > > Does the default configuration already cares for this? If so, which
> > are the
> > > > command-lins options?
> > > >
> > > > If not, I guess that this should be defined in a "profile" in
> > > > "settings.xml". If so, could someone post such a profile?
> > > >
> > > >
> > > > Thanks,
> > > > Gilles
> > > >
> >
> > ---------------------------------------------------------------------
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> >
> >
> 
> 
> -- 
> Xavier DETANT

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