What am I missing here?!?! [SOLVED]

[the.drizzle]

Hiya!

OK, so I'm trying to get LeJOS up and running with an RCX 1.0 and the USB tower. I got firmdl to put the OS on the RCX without too much hassle, but I cannot seem to get anything else to work... In particular, I can compile all of the sample files (at least the ones I have tried), but whenever I try to transfer anything to the brick, I get the same problem:

Code: Select all

$ lejos HelloWorld
linking...
downloading...
read binary
  100%
download binary
Loading native libs
Unable to load native libraries: no jirtrcx in java.library.path
Exception in thread "main" java.lang.UnsatisfiedLinkError: josx.rcxcomm.Tower.close()I
        at josx.rcxcomm.Tower.close(Native Method)
        at josx.rcxcomm.Tower.closeTower(Tower.java:53)
        at js.tools.Download.close(Download.java:88)
        at js.tools.LejosdlTool.start(LejosdlTool.java:120)
        at js.tools.Lejosdl.start(Lejosdl.java:82)
        at js.tools.LejosLinkAndDownload.run(LejosLinkAndDownload.java:89)
        at js.tools.LejosLinkAndDownload.main(LejosLinkAndDownload.java:43)


and nothing happens. I'm using gentoo linux with a 2.6.20 kernel, and legousbtower is built as a module that is autoloaded at startup. Clearly, communication with the brick is possible, as firmdl works without any problems.

Why won't lejos as well?

[the.drizzle]

Well, I still don't quite know what is wrong with the bin/lejos shell script, but I've worked around it.

Basically, I have disregarded the echo CLASSPATH=xxx bit from the instructions, as the gentoo docs strongly discourage this practice, and it slated for removal.

Instead, I have simply added the LEJOS_HOME/bin path to /etc/profile for everyone, and created a small script that does:

Code: Select all

export RCXTTY=/dev/usb/legousbtower0
lejosjc <filename>.java && \
lejoslink -o <filename>.bin <filename> && \
lejosdl --tty /dev/usb/legousbtower0 <filename>.bin


which works like a charm!

[mdsmitty]

I had the same problem but i took the shell script a little farther. Instead of entering the filename at each line i just use it as an argument.
Example: rcx HelloWorld

#!/bin/sh
lejosjc $1.java
lejoslink -o $1.bin $1
lejosdl $1.bin

[lherrera]

The script .../bin/lejos is missing the LD_LIBRARY_PATH. So just adding:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$LEJOS_HOME/bin

after check to $LEJOS_HOME fixes the link problem.