Ошибка при загрузке gnu.io.RXTXCommDriver

Я пытаюсь запустить программу Java, которая перечисляет все доступные порты, используя Eclipse IDE в Ubuntu 14.04. Моя программа выглядит следующим образом:

import gnu.io.CommPortIdentifier;

import java.util.Enumeration;


public class ListAvailablePorts {

public void list() {  
    Enumeration ports = CommPortIdentifier.getPortIdentifiers();  

    while(ports.hasMoreElements())  
        System.out.println(((CommPortIdentifier)ports.nextElement()).getName());
}
public static void main(String[] args) {
    new ListAvailablePorts().list(); 

}

}

Но он показывает следующее предупреждение с ошибкой:

Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library     /usr/lib/jvm/java-8-oracle/jre/lib/amd64/librxtxSerial.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
java.lang.UnsatisfiedLinkError: /usr/lib/jvm/java-8-oracle/jre/lib/amd64/librxtxSerial.so: /usr/lib/jvm/java-8-oracle/jre/lib/amd64/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: /usr/lib/jvm/java-8-oracle/jre/lib/amd64/librxtxSerial.so: /usr/lib/jvm/java-8-oracle/jre/lib/amd64/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:1937)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1843)
at java.lang.Runtime.loadLibrary0(Runtime.java:870)
at java.lang.System.loadLibrary(System.java:1119)
at gnu.io.CommPortIdentifier.<clinit>(CommPortIdentifier.java:83)
at ListAvailablePorts.list(ListAvailablePorts.java:11)
at ListAvailablePorts.main(ListAvailablePorts.java:17)