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a Java classpath question

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  a Java classpath question www <xsli2@yahoo.com> - 2014-03-17 14:47 -0700
    Re: a Java classpath question Knute Johnson <eternal@knutejohnson.com> - 2014-03-17 15:35 -0700
      Re: a Java classpath question Joerg Meier <joergmmeier@arcor.de> - 2014-03-18 00:50 +0100
        Re: a Java classpath question Arne Vajhøj <arne@vajhoej.dk> - 2014-03-17 22:39 -0400
          Re: a Java classpath question Joerg Meier <joergmmeier@arcor.de> - 2014-03-18 11:15 +0100
    Re: a Java classpath question Martin Gregorie <martin@address-in-sig.invalid> - 2014-03-17 22:55 +0000
      Re: a Java classpath question Joerg Meier <joergmmeier@arcor.de> - 2014-03-18 00:52 +0100
        Re: a Java classpath question Martin Gregorie <martin@address-in-sig.invalid> - 2014-03-18 23:29 +0000

#27775 — a Java classpath question

Hi:

I have created my executable JAR file(abc.jar), within it a 3rd party JAR file(def.jar) is included. So my JAR file abc.jar includes def.jar from other people.

My code uses the code in def.jar like this:

find("nonsrc/dog.png");

On the command line, say in the directory /home/test/, there are two items:
abc.jar 
nonsrc/   //containing dog.png file

So, if I am at /home/test directory, this command works well:
java -jar abc.jar  // nonsrc/dog.png file was found by the Java 

But I wish I am not restricted to be running only inside /home/test. So if I am at /home/ directory, I tried this command, but it failed:

java -classpath /home/test/ -jar ./test/abc.jar

The error message says that it cannot find nonsrc/dog.png file. 

Please help.

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#27776

On 3/17/2014 14:47, www wrote:
> Hi:
>
> I have created my executable JAR file(abc.jar), within it a 3rd party
> JAR file(def.jar) is included. So my JAR file abc.jar includes
> def.jar from other people.
>
> My code uses the code in def.jar like this:
>
> find("nonsrc/dog.png");
>
> On the command line, say in the directory /home/test/, there are two
> items: abc.jar nonsrc/   //containing dog.png file
>
> So, if I am at /home/test directory, this command works well: java
> -jar abc.jar  // nonsrc/dog.png file was found by the Java
>
> But I wish I am not restricted to be running only inside /home/test.
> So if I am at /home/ directory, I tried this command, but it failed:
>
> java -classpath /home/test/ -jar ./test/abc.jar
>
> The error message says that it cannot find nonsrc/dog.png file.
>
> Please help.
>

I didn't think you could put a jar file in another jar file and get to
it.  Are you sure it isn't working because the file is in your directory
structure and that's where your program is reading it from?

-- 

Knute Johnson

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#27778

On Mon, 17 Mar 2014 15:35:16 -0700, Knute Johnson wrote:

> I didn't think you could put a jar file in another jar file and get to
> it.

It's definitely possible, as servlet 3.0 does that on library jars.

Liebe Gruesse,
		Joerg

-- 
Ich lese meine Emails nicht, replies to Email bleiben also leider
ungelesen.

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#27780

On 3/17/2014 7:50 PM, Joerg Meier wrote:
> On Mon, 17 Mar 2014 15:35:16 -0700, Knute Johnson wrote:
>
>> I didn't think you could put a jar file in another jar file and get to
>> it.
>
> It's definitely possible, as servlet 3.0 does that on library jars.

Java EE is a bit different from Java SE as the container may do some
unpacking as part of the deployment process.

Arne

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#27782

On Mon, 17 Mar 2014 22:39:40 -0400, Arne Vajhøj wrote:

> On 3/17/2014 7:50 PM, Joerg Meier wrote:
>> On Mon, 17 Mar 2014 15:35:16 -0700, Knute Johnson wrote:
>>> I didn't think you could put a jar file in another jar file and get to
>>> it.
>> It's definitely possible, as servlet 3.0 does that on library jars.
> Java EE is a bit different from Java SE as the container may do some
> unpacking as part of the deployment process.

I didn't consider that, but you have a point.

Liebe Gruesse,
		Joerg

-- 
Ich lese meine Emails nicht, replies to Email bleiben also leider
ungelesen.

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#27777

On Mon, 17 Mar 2014 14:47:54 -0700, www wrote:

> Hi:
> 
> I have created my executable JAR file(abc.jar), within it a 3rd party
> JAR file(def.jar) is included. So my JAR file abc.jar includes def.jar
> from other people.
> 
> My code uses the code in def.jar like this:
> 
> find("nonsrc/dog.png");
> 
> On the command line, say in the directory /home/test/, there are two
> items:
> abc.jar nonsrc/   //containing dog.png file
> 
> So, if I am at /home/test directory, this command works well:
> java -jar abc.jar  // nonsrc/dog.png file was found by the Java
> 
> But I wish I am not restricted to be running only inside /home/test. So
> if I am at /home/ directory, I tried this command, but it failed:
> 
> java -classpath /home/test/ -jar ./test/abc.jar
> 
> The error message says that it cannot find nonsrc/dog.png file.
> 
If you use a -jar option to name the jar file containing your main class, 
you should only need a -classpath if the jarfile content depends on 
another jarfile in addition to the standard Java runtime class library.

IOW, without the -classpath dependency I'd expect a command more like 
this to work: 

   java -jar /path/to/abc.jar classname

where 'classname' is the class which contains the main() method used to 
start the program. You must name this class on the command line unless 
the jarfile contains a manifest that names it. 

What is in your manifest file?



-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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#27779

On Mon, 17 Mar 2014 22:55:44 +0000 (UTC), Martin Gregorie wrote:

> If you use a -jar option to name the jar file containing your main class, 
> you should only need a -classpath

<BEEP>

If you use -jar, -classpath is ignored, so logically nothing could come
after that sentence part that makes sense ;)

Liebe Gruesse,
		Joerg

-- 
Ich lese meine Emails nicht, replies to Email bleiben also leider
ungelesen.

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#27786

On Tue, 18 Mar 2014 00:52:08 +0100, Joerg Meier wrote:

> On Mon, 17 Mar 2014 22:55:44 +0000 (UTC), Martin Gregorie wrote:
> 
>> If you use a -jar option to name the jar file containing your main
>> class,
>> you should only need a -classpath
> 
> <BEEP>
> 
> If you use -jar, -classpath is ignored, so logically nothing could come
> after that sentence part that makes sense ;)
>
OK: I so rarely use a -jar option that I'd forgotten that. 
So, he should be able to successfully run 

   java -jar /home/test/abc.jar 

from any directory he cares to try it in.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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