SVGGeneratorContext exception when calling batik from another jar-file

[rob van nues]

Hello, I am trying to make a kind of drawing application that can save SVG files 
sothat users can work on their stuff in more sophisticated environments. Anyway, 
I followed the code-examples for how to do this and got it working nicely on my 
computer (running linux kernel 2.4.22, Slackware 9.1, IDE environment is One 
Studio). However, when I jar the application and the batik-sources I get a 
problem I cannot figure out. I have seperated the batik stuff and the 
application in two different jar-files, the one containing the application, that 
is the Main class, containing a Class-Path attribute in its manifest to get the 
required batik files. Still I never get my drawings exported properly. I hope 
that someone can help me out here:

In short:
when calling batik from another jar-file this exception happens:
java.lang.NullPointerException
        at 
org.apache.batik.svggen.SVGGeneratorContext.doubleString(SVGGeneratorContext.java:420)
        at org.apache.batik.svggen.SVGPath.appendPoint(SVGPath.java:131)
        at org.apache.batik.svggen.SVGPath.toSVGPathData(SVGPath.java:86)
        at org.apache.batik.svggen.SVGPath.toSVG(SVGPath.java:53)
        at org.apache.batik.svggen.SVGShape.toSVG(SVGShape.java:72)
        at org.apache.batik.svggen.SVGGraphics2D.fill(SVGGraphics2D.java:1232)
        at 
uk.co.nose2nose.vislan.Drawing.ShapeObject.paintImage(ShapeObject.java:136)
        at 
uk.co.nose2nose.vislan.Drawing.DrawingCanvas.repaintOnlyShapes(DrawingCanvas.java:271)
        at 
uk.co.nose2nose.vislan.Drawing.DrawingCanvas.paintSVG(DrawingCanvas.java:106)
        at 
uk.co.nose2nose.vislan.Drawing.Vis2SVGwriter.createSVG(Vis2SVGwriter.java:54)
        at 
uk.co.nose2nose.vislan.Drawing.DrawingCanvas.saveSVG(DrawingCanvas.java:427)
        at 
uk.co.nose2nose.vislan.Drawing.DrawingCanvas.saveCanvas(DrawingCanvas.java:375)

This does not seem to be a classpath issue as far as I can tell, because if I 
change the Class-Path attribute so that the application cannot find the jar 
containing batik, I get:

java.lang.NoClassDefFoundError: org/apache/batik/svggen/SVGGraphics2D
        at 
uk.co.nose2nose.vislan.Drawing.DrawingCanvas.saveSVG(DrawingCanvas.java:421)
        at 
uk.co.nose2nose.vislan.Drawing.DrawingCanvas.saveCanvas(DrawingCanvas.java:375)



The same problem occurs when I create an installer with InstallAnywhere-5.5 and 
run the application as installed (again the batik-sources are included in this 
and put in the class-path). I am run out of ideas how to solve these, to my 
inexperienced eye related problems. I hope someone can help me out in this.

Thanks

Rob van Nues



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