Unable to use RXTX Java library [solved]

[mikek]

I've got an application that requires the use of the RXTX library. I've got it installed against the sun jdk (version 1.6) and it appears like the compiler can't find it.

I've written a small test app that shows the errors:

[alistair]

javac -classpath <path to dependencies separated by :> Test.java


or my favourite

javac -cp $(java-config -p rxtx-2) Test.java

[Edit]

Just because you have rxtx-2 installed does not mean that java can find it automatically.
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[mikek]

[rscott13]

I'm having difficulties with RXTX:

java -cp $(java-config -p rxtx-2) -jar analyzer.jar
Exception in thread "main" java.lang.NoClassDefFoundError: gnu/io/CommPortIdentifier
at org.sump.analyzer.Device.getPorts(Device.java:366)
at org.sump.analyzer.DeviceController.<init>(DeviceController.java:123)
at org.sump.analyzer.MainWindow.<init>(MainWindow.java:252)
at org.sump.analyzer.Loader.main(Loader.java:49)

This is after setting the CLASS_PATH and LD_LIBRARY_PATH variables:
export LD_ export CLASSPATH=.:/usr/share/rxtx-2/lib/RXTXcomm.jar
LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/rxtx-2

And I've emerged rxtx:

emerge -s rxtx
Searching...
[ Results for search key : rxtx ]
[ Applications found : 1 ]

* dev-java/rxtx
Latest version available: 2.1.7.2-r1
Latest version installed: 2.1.7.2-r1
Size of files: 1,314 kB
Homepage: http://rxtx.org/
Description: Native lib providing serial and parallel communication for Java
License: LGPL-2


Any hints? I'm trying to get an FPGA based logic analyzer to work again. (It did work on this system at one point...)

Thanks in advance!

[rscott13]

In case anyone else runs in to this, I hacked around the problem by physically coping the files into the right location.

First, make sure you know which version of java is in use:
java -version

java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) Server VM (build 1.6.0_02-b05, mixed mode)

Go to the java ext lib:
cd /opt/sun-jre-bin-1.6.0.02/lib/ext

Copy the RXTXcomm.jar:
cp -av $(java-config -p rxtx-2) .
`/usr/share/rxtx-2/lib/RXTXcomm.jar' -> `./RXTXcomm.jar'

Now go to binary lib:
cd ../i386
cp -av $(java-config -i rxtx-2)/* .
`/usr/lib/rxtx-2/librxtxI2C-2.1-7.so' -> `./librxtxI2C-2.1-7.so'
`/usr/lib/rxtx-2/librxtxI2C.so' -> `./librxtxI2C.so'
`/usr/lib/rxtx-2/librxtxParallel-2.1-7.so' -> `./librxtxParallel-2.1-7.so'
`/usr/lib/rxtx-2/librxtxParallel.so' -> `./librxtxParallel.so'
`/usr/lib/rxtx-2/librxtxRaw-2.1-7.so' -> `./librxtxRaw-2.1-7.so'
`/usr/lib/rxtx-2/librxtxRaw.so' -> `./librxtxRaw.so'
`/usr/lib/rxtx-2/librxtxRS485-2.1-7.so' -> `./librxtxRS485-2.1-7.so'
`/usr/lib/rxtx-2/librxtxRS485.so' -> `./librxtxRS485.so'
`/usr/lib/rxtx-2/librxtxSerial-2.1-7.so' -> `./librxtxSerial-2.1-7.so'
`/usr/lib/rxtx-2/librxtxSerial.so' -> `./librxtxSerial.so'

I wasn't able to get any combination of CLASSPATH, LD_LIBRARY_PATH to work, which would have been the more elegant way...

[alistair]

you can't combine the -jar and -classpath options

so either java -cp $(java-config .....):launcher.jar org.Path.To.Main.Class

or add a Manifest classpath entry to the launcher.jar
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Help the gentoo-java project. Visit Gentoo Java Project

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[rscott13]

Thanks for the tips - unfortunately, I'm not a java programmer, so I'll have to figure out how to use them.

Assuming I'm successful, will they be portable enough to warrent sending them to the original author of the code?
Or is this stuff gentoo specific?

[alistair]

[alistair]