Mahout, mail # user - Maven build unpacks jars- would jar of jars work?

Re: Maven build unpacks jars- would jar of jars work?

Ted Dunning 2012-08-04, 23:10

I didn't think that Java supports jars inside jars.

On Sat, Aug 4, 2012 at 5:04 PM, Lance Norskog <[EMAIL PROTECTED]> wrote:

> The Maven build does a grand project unpacking multiple jars into one
> big one. Java apparently supports packing jars inside other jars- the
> outer jar needs a classpath property for the inside jars. When someone
> rearranged the Maven build, did they try this out? Is there a Maven
> task for jar-of-jars?
>
> --
> Lance Norskog
> [EMAIL PROTECTED]
>

Re: Maven build unpacks jars- would jar of jars work?

Lance Norskog 2012-08-04, 23:35

There's an ant task, a discussion of its use, and a discussion of jars-in-jars.

http://ant.apache.org/manual/Tasks/manifestclasspath.html
http://stackoverflow.com/questions/858766/generate-manifest-class-path-from-classpath-in-ant
http://grokbase.com/t/ant/user/0213wdmn51/building-a-fileset-dynamically#20020103j47ufvwooklrovrjfdvirgohe4

On Sat, Aug 4, 2012 at 4:10 PM, Ted Dunning <[EMAIL PROTECTED]> wrote:
> I didn't think that Java supports jars inside jars.
>
> On Sat, Aug 4, 2012 at 5:04 PM, Lance Norskog <[EMAIL PROTECTED]> wrote:
>
>> The Maven build does a grand project unpacking multiple jars into one
>> big one. Java apparently supports packing jars inside other jars- the
>> outer jar needs a classpath property for the inside jars. When someone
>> rearranged the Maven build, did they try this out? Is there a Maven
>> task for jar-of-jars?
>>
>> --
>> Lance Norskog
>> [EMAIL PROTECTED]
>>

--
Lance Norskog
[EMAIL PROTECTED]

Re: Maven build unpacks jars- would jar of jars work?

Alex Ott 2012-08-05, 08:25

At least Hadoop is able to find jars inside jar, if they're placed
inside lib directory in the jar - I use this for packing my code (via
assembly plugin), with following assembly description:

<assembly
  xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0
   http://maven.apache.org/xsd/assembly-1.1.0.xsd">
  <id>job</id>
  <formats>
   <format>jar</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <dependencySets>
   <dependencySet>
   <unpack>false</unpack>
   <scope>runtime</scope>
   <outputDirectory>lib</outputDirectory>
   <excludes>
   <exclude>${artifact.groupId}:${artifact.artifactId}</exclude>
   <exclude>org.apache.hadoop:hadoop-core</exclude>
   </excludes>
   </dependencySet>
   <dependencySet>
   <unpack>true</unpack>
   <includes>
   <include>${artifact.groupId}:${artifact.artifactId}</include>
   </includes>
   </dependencySet>
  </dependencySets>
</assembly>
On Sun, Aug 5, 2012 at 1:10 AM, Ted Dunning <[EMAIL PROTECTED]> wrote:
> I didn't think that Java supports jars inside jars.
>
> On Sat, Aug 4, 2012 at 5:04 PM, Lance Norskog <[EMAIL PROTECTED]> wrote:
>
>> The Maven build does a grand project unpacking multiple jars into one
>> big one. Java apparently supports packing jars inside other jars- the
>> outer jar needs a classpath property for the inside jars. When someone
>> rearranged the Maven build, did they try this out? Is there a Maven
>> task for jar-of-jars?
>>
>> --
>> Lance Norskog
>> [EMAIL PROTECTED]
>>

--
With best wishes, Alex Ott
http://alexott.net/
Twitter: alexott_en (English), alexott (Russian)
Skype: alex.ott

Re: Maven build unpacks jars- would jar of jars work?

Ted Dunning 2012-08-05, 08:56

Yes.

Hadoop does do some strange and surprising things with jars when executing
them.

On Sun, Aug 5, 2012 at 2:25 AM, Alex Ott <[EMAIL PROTECTED]> wrote:

> At least Hadoop is able to find jars inside jar, if they're placed
> inside lib directory in the jar - I use this for packing my code (via
> assembly plugin), with following assembly description:
>
> <assembly
> xmlns="
> http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xsi:schemaLocation="
> http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0
> http://maven.apache.org/xsd/assembly-1.1.0.xsd">
> <id>job</id>
> <formats>
> <format>jar</format>
> </formats>
> <includeBaseDirectory>false</includeBaseDirectory>
> <dependencySets>
> <dependencySet>
> <unpack>false</unpack>
> <scope>runtime</scope>
> <outputDirectory>lib</outputDirectory>
> <excludes>
> <exclude>${artifact.groupId}:${artifact.artifactId}</exclude>
> <exclude>org.apache.hadoop:hadoop-core</exclude>
> </excludes>
> </dependencySet>
> <dependencySet>
> <unpack>true</unpack>
> <includes>
> <include>${artifact.groupId}:${artifact.artifactId}</include>
> </includes>
> </dependencySet>
> </dependencySets>
> </assembly>
>
>
> On Sun, Aug 5, 2012 at 1:10 AM, Ted Dunning <[EMAIL PROTECTED]> wrote:
> > I didn't think that Java supports jars inside jars.
> >
> > On Sat, Aug 4, 2012 at 5:04 PM, Lance Norskog <[EMAIL PROTECTED]> wrote:
> >
> >> The Maven build does a grand project unpacking multiple jars into one
> >> big one. Java apparently supports packing jars inside other jars- the
> >> outer jar needs a classpath property for the inside jars. When someone
> >> rearranged the Maven build, did they try this out? Is there a Maven
> >> task for jar-of-jars?
> >>
> >> --
> >> Lance Norskog
> >> [EMAIL PROTECTED]
> >>
>
>
>
> --
> With best wishes, Alex Ott
> http://alexott.net/
> Twitter: alexott_en (English), alexott (Russian)
> Skype: alex.ott
>

Re: Maven build unpacks jars- would jar of jars work?

Lance Norskog 2012-08-07, 01:16

Ah. Half the items I see about this include "you need a special classloader".

On Sun, Aug 5, 2012 at 1:56 AM, Ted Dunning <[EMAIL PROTECTED]> wrote:
> Yes.
>
> Hadoop does do some strange and surprising things with jars when executing
> them.
>
> On Sun, Aug 5, 2012 at 2:25 AM, Alex Ott <[EMAIL PROTECTED]> wrote:
>
>> At least Hadoop is able to find jars inside jar, if they're placed
>> inside lib directory in the jar - I use this for packing my code (via
>> assembly plugin), with following assembly description:
>>
>> <assembly
>> xmlns="
>> http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>> xsi:schemaLocation="
>> http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0
>> http://maven.apache.org/xsd/assembly-1.1.0.xsd">
>> <id>job</id>
>> <formats>
>> <format>jar</format>
>> </formats>
>> <includeBaseDirectory>false</includeBaseDirectory>
>> <dependencySets>
>> <dependencySet>
>> <unpack>false</unpack>
>> <scope>runtime</scope>
>> <outputDirectory>lib</outputDirectory>
>> <excludes>
>> <exclude>${artifact.groupId}:${artifact.artifactId}</exclude>
>> <exclude>org.apache.hadoop:hadoop-core</exclude>
>> </excludes>
>> </dependencySet>
>> <dependencySet>
>> <unpack>true</unpack>
>> <includes>
>> <include>${artifact.groupId}:${artifact.artifactId}</include>
>> </includes>
>> </dependencySet>
>> </dependencySets>
>> </assembly>
>>
>>
>> On Sun, Aug 5, 2012 at 1:10 AM, Ted Dunning <[EMAIL PROTECTED]> wrote:
>> > I didn't think that Java supports jars inside jars.
>> >
>> > On Sat, Aug 4, 2012 at 5:04 PM, Lance Norskog <[EMAIL PROTECTED]> wrote:
>> >
>> >> The Maven build does a grand project unpacking multiple jars into one
>> >> big one. Java apparently supports packing jars inside other jars- the
>> >> outer jar needs a classpath property for the inside jars. When someone
>> >> rearranged the Maven build, did they try this out? Is there a Maven
>> >> task for jar-of-jars?
>> >>
>> >> --
>> >> Lance Norskog
>> >> [EMAIL PROTECTED]
>> >>
>>
>>
>>
>> --
>> With best wishes, Alex Ott
>> http://alexott.net/
>> Twitter: alexott_en (English), alexott (Russian)
>> Skype: alex.ott
>>

--
Lance Norskog
[EMAIL PROTECTED]