Java Mapscript - problems loading .map file on windows - same code fine in linux

[James Dracup]

Hi,

I'm have a fairly annoying issue when trying to load a map file into a java 
mapObj object when running in windows XP.  I'm using mapserver 4.8.3 as 
distributed with ms4w 1.5.1 - i'm also using the mapscript.dll and 
mapscript.jar as distributed with that ms4w.  My app is a servlet that runs 
under tomcat 5.5, with a sun 1.5 jvm.  I'm fairly confident my paths etc. 
are fine.

The java code really just boils down to one line:

mapObj mapobj = new mapObj(sMapFilename);

The exception is thrown by that statement.  And is..

java.lang.UnknownError: No such file or directory
	edu.umn.gis.mapscript.mapscriptJNI.new_mapObj(Native Method)
	edu.umn.gis.mapscript.mapObj.<init>(mapObj.java:312)
	myapp.ModifiedMapObj.<init>(ModifiedMapObj.java:48)
	myapp.Test.doGet(Test.java:37)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

I'm sure it finds my map file fine, as if you pass a messed up string it 
gives a different error (java.io.IOException).

I'm also confident there's nothing wrong with my .map file as the test one 
is simple (map file attached below anyway), everything is in the same 
directory and it works fine with a cgi wms request on the same windows 
machine.  And...
(here's the annoying bit)
..it also works fine when I deploy exactly the same compiled code with 
exactly the same .map file and shp files on my linux (fedora) box.  On that 
box it's a slightly different version of mapserver/mapscript (compiled them 
myself), tomcat 5 not 5.5 and a sun 1.4 jvm - but still, why does the code 
work on that box and not on windows?

If anyone has any ideas at all it would be much appreciated?

Thanks, James

---.map file contents---

#
# Start of WMS Server map file
MAP
NAME WMS_server
IMAGECOLOR 250	250 250
SIZE 800 600
STATUS ON
PROJECTION
  "init=epsg:27700"
END
EXTENT 275000 180000 285000 190000

SYMBOLSET OSMMsymbolsTest.sym
FONTSET fonts.txt
UNITS METERS

WEB
  IMAGEPATH "/ms4w/tmp/ms_tmp/"
  IMAGEURL "/ms_tmp/"
END

LAYER
  NAME TopographicArea
  METADATA
    "wms_title"    "TopographicArea"
  END
  TYPE POLYGON
  STATUS ON
  DATA TopographicArea
  PROJECTION
    "init=epsg:27700"
  END
  CLASS
    NAME "default"
    STYLE
      COLOR 255 204 153
      OUTLINECOLOR 0 0 0
    END
  END
END
END # Map File