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add nested jar to build path [message #729415]

Mon, 26 September 2011 06:54

labernit

Messages: 1
Registered: September 2011

Junior Member

Hello all,

i really searched a lot but i couldn't find an answer, so i hope you can help me Smile

I have a standard java eclipse project (no maven / ant ,...) and i want to use an external software. This is provided as a jar file, and the respective dependencies are also bundled in that jar file. So the jar file looks like this:
/src
dep1.jar
dep2.jar
...

But if i simply add the overall jar to my buildpath, it seems like all the nested or inner jars (dep1.jar,...) are not correctly loaded.

So my question is, does eclipse load these inner / nested jars at all?
If not, what can i do Smile

Thanks in advance

Greetings,
Martin

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Re: add nested jar to build path [message #730345 is a reply to message #729415]

Wed, 28 September 2011 08:11

Daniel Missing name

Messages: 101
Registered: July 2011

Senior Member

Hi.

I just encountered the same problem. I created a Jar of my Project using the "Runnable JAR file" export wizard. I used the "Package required libraries into generated JAR" as library handling. Therefore all dependency jars are placed into the root of the exported JAR. If I add this "all in one"-JAR to the build path of another project the nested jars are not recognized and added to the build-path.

I also couldn't find any option like "include nested jars" or to change the class-loader.

Greetings Daniel

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Re: add nested jar to build path [message #730372 is a reply to message #730345]

Wed, 28 September 2011 08:50

Dani Megert

Messages: 3802
Registered: July 2009

Senior Member

On 28.09.2011 10:11, Daniel wrote:
> Hi.
> I just encountered the same problem. I created a Jar of my Project
> using the "Runnable JAR file" export wizard. I used the "Package
> required libraries into generated JAR" as library handling. Therefore
> all dependency jars are placed into the root of the exported JAR. If I
> add this "all in one"-JAR to the build path of another project the
> nested jars are not recognized and added to the build-path.
> I also couldn't find any option like "include nested jars" or to
> change the class-loader.
This is expected. Java does not handle nested JARs. The 'Runnable JAR
file' export wizard not only adds the stuff to the exported JAR but also
adds a custom class loader so that the runnable JAR can be launched
outside Eclipse. Using such a JAR in another context, e.g. by adding it
to another build path, won't work.

Dani
>
> Greetings Daniel

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Re: add nested jar to build path [message #730373 is a reply to message #729415]

Wed, 28 September 2011 08:52

Dani Megert

Messages: 3802
Registered: July 2009

Senior Member

On 26.09.2011 08:54, labernit wrote:
> Hello all,
>
> i really searched a lot but i couldn't find an answer, so i hope you
> can help me :)
>
> I have a standard java eclipse project (no maven / ant ,...) and i
> want to use an external software. This is provided as a jar file, and
> the respective dependencies are also bundled in that jar file. So the
> jar file looks like this:
> /src
> dep1.jar
> dep2.jar
> ..
>
> But if i simply add the overall jar to my buildpath, it seems like all
> the nested or inner jars (dep1.jar,...) are not correctly loaded.
>
> So my question is, does eclipse load these inner / nested jars at all?
> If not, what can i do :)
This is expected. Java does not handle nested JARs. You would have to
write your own class loader to do this or export your code using the
'Runnable JAR file' wizard, which adds such a class loader.

Dani
>
> Thanks in advance
>
> Greetings,
> Martin

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