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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 16:04:04 GMT
On Wed, Jun 13, 2012 at 10:53:08AM -0400, James Carman wrote:
> You'd be better off using something like Jenkins for this.  You could
> set up different jobs to run your builds under different conditions
> (windoze vs. linux, jdk7 vs. jdk6, etc.)

I don't deny that such a tool is useful, but my purpose is not continuous
integration; just, at some point in time, be able to compile and run the
tests with different JDK versions/vendors (and expecting the same output).

Best regards,
Gilles

> 
> On Wed, Jun 13, 2012 at 10:47 AM, Gilles Sadowski
> <gilles@harfang.homelinux.org> wrote:
> > On Wed, Jun 13, 2012 at 03:05:13PM +0200, Xavier Detant wrote:
> >> The byte code generated by the compiler is totally independent from the JVM
> >> that will be used to run it.
> >
> > Totally independent? Compiling with 1.7 and running with 1.6 will raise this
> > error:
> >  Unsupported major.minor version 51.0
> >
> >> So I think the point is not «How to compile
> >> using the right JDK?» but «How to run with using the right JVM?» Am I
> >> wrong?
> >
> > It is both: compiling _and_ running the tests.
> >
> > I should be able to do all combinations, i.e.:
> >  1. Compile with javac 1.6 and run with java 1.6
> >  2. Compile with javac 1.7 and run with java 1.7
> >  3. Compile with javac 1.6 and run with java 1.7
> > (and similarly with s/6/5/)
> >
> >> If so, this can't be done at compile time, so it can't be done via
> >> maven, unless you use antrun maven's plugin to create a ant task to launch
> >> your program.
> >
> > The point is to compile and then _run_ the unit tests, assuming that the
> > code conforms to the syntax of Java 5, Java 6, and Java 7, respectively.
> >
> > In particular, if some source code is Java 5, it should be compatible with
> > more recent versions of the Java language, thus be compilable with more
> > recent implementations of javac.
> > The ultimate goal is to check that the unit tests pass independently of the
> > javac and java versions.
> >
> >
> > Best regards,
> > Gilles
> >
> >>
> >> 2012/6/13 Gilles Sadowski <gilles@harfang.homelinux.org>
> >>
> >> > 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
> >> > > > > >
> >> > > >
> >> > > > ---------------------------------------------------------------------
> >> > > > To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
> >> > > > For additional commands, e-mail: dev-help@commons.apache.org
> >> > > >
> >> > > >
> >> > >
> >> > >
> >> > > --
> >> > > Xavier DETANT
> >> >
> >> > ---------------------------------------------------------------------
> >> > To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
> >> > For additional commands, e-mail: dev-help@commons.apache.org
> >> >
> >> >
> >>
> >>
> >> --
> >> Xavier DETANT
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org
> > For additional commands, e-mail: dev-help@commons.apache.org
> >
> 
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