RXTX library failed on Ubuntu

Question

Trying to run java programm, on Ubuntu machine. Java programm is using RXTX library and crashes when program is trying to open com port:

java.lang.UnsatisfiedLinkError: /opt/pnt/lib/librxtxSerial.so: /opt/pnt/lib/librxtxSerial.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch) thrown while loading gnu.io.RXTXCommDriver
Exception in thread "main" java.lang.UnsatisfiedLinkError: /opt/pnt/lib/librxtxSerial.so: /opt/pnt/lib/librxtxSerial.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)
    at java.lang.ClassLoader$NativeLibrary.load(Native Method)
    at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1750)
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1675)
    at java.lang.Runtime.loadLibrary0(Runtime.java:840)
    at java.lang.System.loadLibrary(System.java:1047)
    at gnu.io.CommPortIdentifier.<clinit>(CommPortIdentifier.java:83)
    at Serial.tSerial.connect(tSerial.java:565)
    at protocol.Msg.open(Msg.java:196)
    at protocol.Msg.getMsg(Msg.java:66)
    at jeasi.MyHandler.<init>(MyHandler.java:56)
    at jeasi.MyHandler.main(MyHandler.java:665)

What might be wrong?

Start programm script:

cd /opt/pnt;
/usr/bin/java -Djava.library.path=/opt/pnt/lib -cp /opt/pnt/lib/commons-codec-1.5.jar:/opt/pnt/lib/log4j.jar:/opt/pnt/lib/RXTXcomm.jar:/opt/pnt/bin:. pr.MyHandler

Answer 1

You're running a 64bit JVM and only installed a 32bit version of rxtx. You should go to one of the forks of rxtx as listed on the page and download a 64bit compiled version of the library.

The mfizz.com Version seems to have the easiest to download copies of the library for x64.