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From Christopher BROWN <br...@reflexe.fr>
Subject Re: Compiling "core" and "client" with target Java 1.6 classfile format
Date Tue, 01 Oct 2013 20:12:44 GMT
Hello,

Using the command:
mvn -Dmaven.compiler.target=1.6 package

...produced what I was looking for, classfiles with version 50.

Thanks,
Christopher



On 1 October 2013 18:42, sebb <sebbaz@gmail.com> wrote:

> On 1 October 2013 16:36, Christopher BROWN <brown@reflexe.fr> wrote:
> > Thanks for the link Oleg.  Having followed it, and not being an avid
> Maven
> > user, I assume that I need to add something like this:
> >
> > <properties>
> > <maven.compiler.source>1.5</maven.compiler.source>
> > <maven.compiler.target>1.6</maven.compiler.target>
> > </properties>
> >
> > => (changing "maven.compiler.target" to "1.6"), just before the closing
> > </project> tag in the "pom.xml" file at the top of the "src" package.
> >  Which should in turn cascade (effectively, not physically by copying)
> into
> > the POMs in the subfolders, such as "httpcore", "httpcore-nio", I expect.
> > Is this correct?
>
> That is the correct way to define properties.
> You can also define them on the command line:
>
> mvn -Dmaven.compiler.target=1.6 package
>
> Note that those properties only affect the -source and -target options
> that are passed to the compiler.
>
> > Sorry for the "theoretical" answer, I will try it when I can (I can't
> right
> > now), was just wondering if I was on the right track...
> >
> > --
> > Christopher
> >
> >
> >
> >
> > On 1 October 2013 16:41, Oleg Kalnichevski <olegk@apache.org> wrote:
> >
> >> On Tue, 2013-10-01 at 06:48 +0200, Christopher BROWN wrote:
> >> > Hi,
> >> >
> >> > More of an Ant user, I tried configuring the POM file after
> downloading
> >> > http "core" (haven't tried "client" yet) to compile to Java 1.6, for a
> >> more
> >> > recent classfile format (it's slightly more efficient).
> >> >
> >> > I tried to follow advice here:
> >> >
> >>
> http://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html
> >> >
> >> > ...but couldn't see any references to maven-compiler-plugin in any of
> the
> >> > pom.xml files (including those in subdirectories).
> >> >
> >> > There seems to be some magic going on, as I tried compiling anyway,
> and
> >> > after inspecting the generated classes in the generated jars ("mvn
> >> install"
> >> > was successful), it appears that the output classfile version is 49
> (as
> >> in
> >> > Java 5)... I checked as follows:
> >> > javap -v org.apache.http.util.VersionInfo
> >> >
> >> > I said "magic", because I'm using Mac OS X 10.8 from 2012 with only
> Java
> >> 6,
> >> > 7, and 8 installed...
> >> >
> >> > I'm curious to know how Java 5 is specified and used for compilation,
> and
> >> > would like to compile with the most recent "javac" version possible.
> >> >
> >> > Thanks,
> >> > Christopher
> >>
> >> The usual delights of dealing with complex build systems. I think the
> >> default compiler target and source levels are defined in the parent POM:
> >>
> >>
> >>
> http://search.maven.org/remotecontent?filepath=org/apache/httpcomponents/project/7/project-7.pom
> >>
> >> One should be able to override them at individual POM level, though.
> >>
> >> Oleg
> >>
> >>
> >>
> >> ---------------------------------------------------------------------
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> >>
> >>
>
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>

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