- To: mathgroup at smc.vnet.net
- Subject: [mg27381] Re: J/Link
- From: tgayley at wolfram.com (Todd Gayley)
- Date: Thu, 22 Feb 2001 02:25:28 -0500 (EST)
- Organization: Wolfram Research, Inc.
- References: <email@example.com>
- Sender: owner-wri-mathgroup at wolfram.com
On 21 Feb 2001 03:16:54 -0500, Rainer Gruber <rainer.gruber at students.uni-linz.ac.at> wrote: >Hi there, > >I have a little problem using J/Link. >I have two computers with Mathematica 18.104.22.168 running under Windows 98. On both devices there is the same Java version installed. On one computer J/Link works fine, on the the other one it does not run at all! > >Though its possible to start Java with InstallJava I can't create a Java object with JavaNew or LoadClass but I always get an error message like >LoadClass::"fail" : Java failed to load class ... > >I have tried all possibilities for PATH and CLASSPATH but I had no success! > >The only idea I have: On the computer where J/Link doesn't work I've another directory structure than the usual one (C:\Mathematica4\... instead of C:\Programme\Wolfram Research\Mathematica\4.0\... or so). > >Is this an obstacle problem for J/Link? Rainer, Having a non-standard directory structure is not a problem. What happens if you do this: LoadClass["java.lang.Object"] If it fails, do you get error messages other than LoadClass::fail? Do you see any output in the Java stdout window? If you do, then that will be the crucial piece of evidence to determine the problem. If this succeeds, then J/Link is working. If you cannot load some specific classes on one machine, it is most likely a CLASSPATH problem. You might want to reinstall J/Link. You will have problems if you have components from different versions of J/Link mixed together. Sometimes people don't realize that they still have an old copy of JLinkNativeLibrary.dll or JLink.jar kicking around. Todd Gayley Wolfram Research