I wanted to try the bleeding edge software that Adrian is working on. First I got the latest source
svn co http://reprap.svn.sourceforge.net/svnroot/reprap/trunk/reprap/host reprap
There is a setup-reprap-host-dev-environment.sh script that probably works but it downloads an installs versions of stuff, that i didn’t want cluttering up my system.
Also it seems that the intention is to distribute the files that get downloaded with the reprap source anyway, and indeed I already had them by now since they are in the svn repository.
In short I didn’t see the point of setup-reprap-host-dev-environment.sh and took it apon myself to “fix it” so that it uses the jar files included in reprap/lib
Firstly I modified the build-user.xml file so that the classpath was as specified in the manifest section as follows:
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
<attribute name="Class-Path" value="./lib/j3dcore.jar ./lib/vecmath.jar ./lib/j3dutils.jar ./lib/RXTXcomm.jar ./lib/swing-layout-1.0.3.jar ./lib/j3d-org-java3d-all.jar ./lib/"/>
</manifest>
The next step was to set the CLASSPATH enviroment variable so that I could compile the source
export CLASSPATH="./lib/j3dcore.jar;./lib/vecmath.jar;./lib/j3dutils.jar;./lib/RXTXcomm.jar;./lib/swing-layout-1.0.3.jar;./lib/j3d-org-java3d-all.jar"
Then I compiled it and moved the resulting reprap.jar file into the current dir …
cd reprap ant jar mv jar/reprap.jar .
… so that it could be run by using
./reprap-host.sh
Giles Bathgate 
Just catching up on your posts its looking good.. I need to decide on which OS to use next Windas or Ubuntu.. Just download Ubuntu 9.1 Oh and I got 4 of those Thermistors you found at Farnell thank they look good.. nice long leads too
Just remembered that the reason I wanted to post this was because I kept getting runtime errors, it turns out that when you run java with the -jar commandline option it ignores CLASSPATH environment variable aswell as ignoring the -classpath command line argument, so the only way to get it to work was to include the class path in the manifest of reprap.jarThe error I kept getting was:Exception in thread "RepRap" java.lang.NoClassDefFoundError: javax/vecmath/Color3f at org.reprap.Preferences.(Unknown Source) at org.reprap.machines.MachineFactory.create(Unknown Source) at org.reprap.Main.(Unknown Source) at org.reprap.Main$10.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226) at java.awt.EventQueue.dispatchEvent(EventQueue.java:602) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177) at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)Caused by: java.lang.ClassNotFoundException: javax.vecmath.Color3f at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:319) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:264) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) … 12 moreHopefully google will pick this up, and if anyone has the same problem then this post will be of use.
You normally use http://en.wikipedia.org/wiki/Manifest_file to declare classpath in jars.Your ide should do that automatically if you use it.I don't remember how to do it from the command line. IF you need to do it manually the look here http://en.wikipedia.org/wiki/Classpath_%28Java%29#Setting_the_path_in_a_Manifest_file
I understand that most people probably use Eclipse IDE to compile this source. I just wanted a neat way of doing it wihtout needing the IDE. As I understand, by adding the attributes to the build-user.xml file the said manifest file is automatically generated by ant. My solution works, but no doubt there are many ways to achieve the same thing.