Eclipse Community Forums: Java Development Tools (JDT) » java.library.path issues with external library

Help

Home

Home » Language IDEs » Java Development Tools (JDT) » java.library.path issues with external library

Show: Today's Messages :: Show Polls :: Message Navigator

java.library.path issues with external library [message #223730]

Tue, 07 February 2006 03:56

Eclipse User

Originally posted by: me2.nowhere.com

I am building my first swt app that uses an external library. I am trying
to use rxtx (http://www.rxtx.org/) to facilitate serial communications
from my Java application.

My app worked fine until I added the rxtx stuff. I added the necessary
imports and it builds fine. In Properties->JavaBuildPath->Order and
Export, I added RXTXcomm.jar.

When I run the application, I get:
java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown
while loading gnu.io.RXTXCommDriver

So, I add -Djava.library.path=/usr/java/jre1.5.0_05/lib/i386 to
Run...<RunID>->WM Arguments.

Then when I run the application I get:
Exception in thread "main" java.lang.UnsatisfiedLinkError: no
swt-pi-gtk-3139 in java.library.path

How do I get both libraries to load at run time ?

Thanks.

Report message to a moderator

Re: java.library.path issues with external library [message #223738 is a reply to message #223730]

Tue, 07 February 2006 04:30

Eclipse User

Originally posted by: me2.nowhere.com

I found the file libswt-pi-gtk-3139.so in /usr/lib.

I tried -Djava.library.path=/usr/java/jre1.5.0_05/lib/i386;/usr/lib with
no joy.

-Djava.library.path=/usr/java/jre1.5.0_05/lib/i386:/usr/lib and it seems
to have worked.

Report message to a moderator

Re: java.library.path issues with external library [message #223779 is a reply to message #223730]

Tue, 07 February 2006 13:18

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

When you get to your jar in the build path, you can also expand the jar
and add a native library entry that points to the correct native library
dir for that jar ... then eclipse will automatically compute the
java.library.path for you.

Later,
PW

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

Report message to a moderator

Re: java.library.path issues with external library [message #223793 is a reply to message #223730]

Tue, 07 February 2006 14:40

Michael

Messages: 40
Registered: July 2009

Member

Hello,

I think this problem is not because of the jar files. Both of the
libraries try to load a dll. Please check that the dlls can be found in
the search path. The easiest way to check this is to copy them to the
windows system32 folder. If this source of the problem you can try further
to adjust your paths.

HTH,
Michael

On Mon, 06 Feb 2006 20:56:00 -0700, me2 wrote:

>
> I am building my first swt app that uses an external library. I am trying
> to use rxtx (http://www.rxtx.org/) to facilitate serial communications
> from my Java application.
>
> My app worked fine until I added the rxtx stuff. I added the necessary
> imports and it builds fine. In Properties->JavaBuildPath->Order and
> Export, I added RXTXcomm.jar.
>
> When I run the application, I get:
> java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown
> while loading gnu.io.RXTXCommDriver
>
> So, I add -Djava.library.path=/usr/java/jre1.5.0_05/lib/i386 to
> Run...<RunID>->WM Arguments.
>
> Then when I run the application I get:
> Exception in thread "main" java.lang.UnsatisfiedLinkError: no
> swt-pi-gtk-3139 in java.library.path
>
> How do I get both libraries to load at run time ?
>
> Thanks.

Report message to a moderator

Re: java.library.path issues with external library [message #223844 is a reply to message #223779]

Wed, 08 February 2006 00:11

Eclipse User

Originally posted by: me2.nowhere.com

On Tue, 07 Feb 2006 08:18:06 -0500, Paul Webster wrote:

> When you get to your jar in the build path, you can also expand the jar
> and add a native library entry that points to the correct native library
> dir for that jar ... then eclipse will automatically compute the
> java.library.path for you.
>
> Later,
> PW

Thanks. I'll give that a try too.

Report message to a moderator

Re: java.library.path issues with external library [message #223850 is a reply to message #223793]

Wed, 08 February 2006 00:20

Eclipse User

Originally posted by: me2.nowhere.com

On Tue, 07 Feb 2006 15:40:03 +0100, michael wrote:

> Hello,
>
> I think this problem is not because of the jar files. Both of the
> libraries try to load a dll. Please check that the dlls can be found in
> the search path. The easiest way to check this is to copy them to the
> windows system32 folder. If this source of the problem you can try further
> to adjust your paths.
>
> HTH,
> Michael

Err... I'm running Linux...

Report message to a moderator

Re: java.library.path issues with external library [message #223878 is a reply to message #223850]

Wed, 08 February 2006 14:12

Michael

Messages: 40
Registered: July 2009

Member

Then it'll be a shared lib and your $PATH... ;)

> Err... I'm running Linux...

Report message to a moderator

Re: java.library.path issues with external library [message #223885 is a reply to message #223850]

Wed, 08 February 2006 14:49

Michael

Messages: 40
Registered: July 2009

Member

Now I just tried it...
rxtx stuff is relative to source code

Sample code:
----------------------------------------
import gnu.io.*;
import java.util.*;

class ShowPorts {
public static void main(String[] args) {
CommPortIdentifier portId;
Enumeration en = CommPortIdentifier.getPortIdentifiers();
while (en.hasMoreElements()) {
portId = (CommPortIdentifier) en.nextElement();
System.out.println(portId.getName());
}
}
}
----------------------------------------

Compiled with: javac -classpath rxtx-2.1-7-bins/RXTXcomm.jar
ShowPorts.java

Executed with: java -classpath .:rxtx-2.1-7-bins/RXTXcomm.jar
-Djava.library.path=rxtx-2.1-7-bins/Linux/i686-unknown-linux -gnu ShowPorts

Or executed with: LD_LIBRARY_PATH=rxtx-2.1-7-bins/Linux/i686-unknown-linux-gnu java
-classpath .:rxtx-2.1-7-bins/RXTXcomm.jar ShowPorts

Result:
Experimental: JNI_OnLoad called.
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
/dev/ttyS0

It's the same for swt but with a different shlib.

HTH,
Michael

Report message to a moderator

Re: java.library.path issues with external library [message #223892 is a reply to message #223878]

Wed, 08 February 2006 14:50

Michael

Messages: 40
Registered: July 2009

Member

LD_LIBRARY_PATH i mean

> Then it'll be a shared lib and your $PATH... ;)
>
>> Err... I'm running Linux...

Report message to a moderator

Previous Topic:	Can I use multiple JDT model to represent the same file loaded at different time
Next Topic:	difference between javac and eclipse compile when inheriting abstract Charset

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Tue Apr 16 20:56:13 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter