java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown while loading gnu.io.RXTXCommDriver

Question

Fedora using right now (package is installed Package rxtx-2.2-0.5.20100211.fc15.i686 already installed and latest version).

I have used/tried:

# locate librxtxSerial
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Linux/i686-unknown-linux-gnu/librxtxSerial.so
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Linux/ia64-unkown-linux-gnu/librxtxSerial.so
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Linux/x86_64-unknown-linux-gnu/librxtxSerial.so
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Mac_OS_X/librxtxSerial.jnilib
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Solaris/sparc-solaris/sparc32-sun-solaris2.8/librxtxSerial-2.1-7.so
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Solaris/sparc-solaris/sparc32-sun-solaris2.8/librxtxSerial.so
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Solaris/sparc-solaris/sparc64-sun-solaris2.8/librxtxSerial-2.1-7.so
/home/sun/Downloads/rxtx-2.1-7-bins-r2/Solaris/sparc-solaris/sparc64-sun-solaris2.8/librxtxSerial.so
/usr/lib/rxtx/librxtxSerial-2.2pre1.so
/usr/lib/rxtx/librxtxSerial.so

Then used:

-Djava.library.path=/usr/lib/rxtx/librxtxSerial.so -Djava.library.path=/usr/lib/jni

But still i get always this following:

java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown while loading gnu.io.RXTXCommDriver
Exception in thread "main" java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1681)
    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 main.Tty.sendCommand1(Tty.java:212)
    at main.Tty.main(Tty.java:236)

How to resolve this ?

Follow up:

WRONG:

-Djava.library.path=/usr/lib/rxtx -Djava.library.path=/usr/lib/jni

CORRECT

-Djava.library.path=/usr/lib/jni -Djava.library.path=/usr/lib/rxtx

seems you have some libraries are missing. – user1335794 May 25 '12 at 08:55 — user1335794, May 25 '12 at 08:55
Please post the java code you are using to load the lib. – Santosh May 25 '12 at 08:59 — Santosh, May 25 '12 at 08:59

score 6 · Accepted Answer · answered May 25 '12 at 09:23

I guess the problem is that you have multiple -Djava.library.path parameters and the second one is overwriting the value of the first. The value should also be the path to the folder containing the library, not including the library name.

On linux system you should be able to combine both path parameters using a colon as separator:

-Djava.library.path=/usr/lib/rxtx:/usr/lib/jni

score 4 · Answer 2 · answered May 14 '13 at 06:23

4

Had same problem with v4l4j library installed from repositories. In ununtu netbeans project failed to start from IDE, but worked fine as jar.

Solved by putting *.so files to /usr/lib not /usr/lib/jni folder.

answered May 14 '13 at 06:23

Zon

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Best of best answer! This method works for pidora os also :thumbsup – noelyahan Sep 19 '13 at 10:56
1

This worked for me in Raspbian as well! I first installed RXTX drivers using `sudo apt-get install librxtx-java` and then copied all the files /usr/lib and it worked! – Ranhiru Jude Cooray Apr 17 '14 at 13:16

score 2 · Answer 3 · answered Nov 28 '13 at 05:04

2

Project -> properties -> Java build path ->Find your .jar. Click on + to open the JAR's properties. Select Native library location and edit it to point to RXTX's shared library (.DLL, .so, .dylib).

answered Nov 28 '13 at 05:04

Paulo Gurgel

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score 0 · Answer 4 · edited Mar 12 '13 at 11:38

0

We had the same problem on linux. The key for us to fix it was

Use colon ":" to separate java.library.path elements
Use forward slash for directory separators

In our case we used a relative path like this

-Djava.library.path=jar/linux64:jars

The path is relative to the startup path. E.g. when running from netbeans the startup directory is the project directory.

edited Mar 12 '13 at 11:38

nsgulliver

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answered Mar 12 '13 at 11:22

tobi delbruck

301
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score -1 · Answer 5 · answered Mar 30 '17 at 21:39

-1

Copy RXTXcomm.jar ---> <JAVA_HOME>\jre\lib\ext

Copy rxtxSerial.dll ---> <JAVA_HOME>\jre\bin

Copy rxtxParallel.dll ---> <JAVA_HOME>\jre\bin

answered Mar 30 '17 at 21:39

Hans Pour

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java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path thrown while loading gnu.io.RXTXCommDriver

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