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From sebb <seb...@gmail.com>
Subject Re: Compiling "core" and "client" with target Java 1.6 classfile format
Date Tue, 01 Oct 2013 16:42:40 GMT
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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