[news.eclipse.platform.swt] Re: Deploying SWT Application and swt-pi-gtk

[Mark Dexter <dextercowley@xxxxxxxxx>]

Reginald Johnson wrote:
> Hello,
>   I have an SWT app that works great when run using the run command in 
> Eclipse on Ubuntu Gusty Gibbon with the java -version command returning 
> the following:
> java version "1.6.0_03"
> Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
> Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)
>
> Unfortunately, I can't create a working jar out of it to save my life.  
> Basically, I have a working program that is trapped in Eclipse.  After 
> creating my jar (using the Eclipse "Export" to jar technique as well as 
> the Java javac method with the command  jar cmf manifest1.txt 
> SunMouseDatabase1.jar MouseDatabaseApp.class ./lib/* ) and attempting to 
> run it with the following command:
>
> java -jar SunMouseDatabase1.jar
> I get this error:
> Exception in thread "main" java.lang.UnsatisfiedLinkError: no 
> swt-pi-gtk-3236 in java.library.path
>  at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)
>        at java.lang.Runtime.loadLibrary0(Runtime.java:823)
>        at java.lang.System.loadLibrary(System.java:1030)
>        at org.eclipse.swt.internal.Library.loadLibrary(Library.java:123)
>        at org.eclipse.swt.internal.gtk.OS.<clinit>(OS.java:22)
>        at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63)
>        at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54)
>        at org.eclipse.swt.widgets.Display.<clinit>(Display.java:126)
>        at MouseDatabaseApp.main(MouseDatabaseApp.java:346)
>
> After poking around my system I was able to find a file called 
> libswt-pi-gtk-3236.so, but I'm not familiar with the ".so" file type.  
> I've put that file in my lib directory and pointed to it in the 
> Class-Path of my Manifest file, but I get the same error whether that is 
> in there or not.
>
> the Manifest.mf file in the jar is as follows:
>
> Manifest-Version: 1.0
>
> Class-Path: lib/derby.jar lib/iText-2.0.8.jar lib/jcommon-1.0.12.jar 
> lib/jfreechart-1.0.9-experimental.jar lib/jfreechart-1.0.9-swt.jar 
> lib/opencsv-1.9.jar lib/swtgraphics2d.jar 
> lib/org.eclipse.swt.gtk.linux.x86_3.2.2.v3236.jar 
> lib/org.eclipse.swt_3.2.2.v3236b lib/libswt-pi-gtk-3236.so
> Created-By: 1.6.0_03 (Sun Microsystems Inc.)
> Main-Class: MouseDatabaseApp
>
> The Class-Path line is all on one line with no line breaks.  I've been 
> working and googling this problem over the past two days with no luck, 
> and would appreciate any help.  Thanks.
Hi Reginald. I think the .so is a Linux executable (equivalent to a .DLL 
file in Windows). I believe that the Class-Path line in the manifest 
file only applies to the .JAR files, not to the .so files. I think the 
.so file needs to be in the Linux execution path. In Windows, you can 
put the SWT .DLL files in the same directory as the .JAR file you are 
executing (or in the execution path, like Windows\system32), but I don't 
know if having it in the same directory works in Linux. But if the .so 
file is on your execution path, I think it should work.

On the SWT FAQ, there is a question "What do I need to run SWT on 
Linux/GTK? (http://www.eclipse.org/swt/faq.php#gtkstartup)

It would seem to imply that the platform-specific binaries for SWT 
(i.e., the .so files) are included in the Linux packages. I looked for 
step-by-step instructions for deploying SWT on Linux and couldn't find 
any, but I think you are very close.

Hope this helps. Mark