java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path

Question

I am trying to use the 64 bit rxtx serial communication library (downloaded from cloudhopper) with 64bit windows 7 and eclipse. I get the message: java.lang.UnsatisfiedLinkError: no rxtxSerial in java.library.path. The dlls are in the /jre/lib dir as well as the Windows/System32. The RXTXcomm.jar is in the build path for eclipse as well as in the jre/lib/ext dir. I ran process monitor in the background and and see that RXTXcomm.jar, rxtxSerial.dll, and rxtxParallel.dll are all found and have been opened, So I am unclear as to why this problem is occurring.

Any suggestions.

Answer 1

Go to 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).

Answer 2

You can install librxtx-java package from repo for Ubuntu.

Answer 3

You can also add a virtual machine argument:

-Djava.library.path=c:\path\to\dll\

or

-Djava.library.path=/path/to/lib/

That worked for me. Also refer to this question.

Answer 4

Windows user : my problem was actually that I was placing the rxtxSerial.dll and the rxtxParallel.dll files in the wrong directory.

In my case, they were in [...]/jdk1.7.0_09/bin/ instead of [...]/jre7/bin/, although paths may differ for different versions of Java.

After all it's logic, if we want our JAR to run outside our IDE, we must have the dlls in our java running environment, not in our development environment :)

Answer 5

I resolve this problem by adding rxtxSerial.dll[jre 1.8.0_45/bin] and RxTxcomm.jar[jre 1.8.0_45/lib/ext]

Answer 6

Hy, I had the same problem when integrating the RXTXcomm into Netbeans under Ubuntu 11.10. I am guessing that you are not copying the files in the right place, at least that was my problem.

Under Ubuntu java is installed under usr/lib/jvm. BUT here I had a lot of forders (ex java-7-openjdk-i386, java-7-common, java-6-openjdk ...). In Netbeans I check what is the path of the JDK included into the project, it was java-7-openjdk-i386 . so I took the rxtxSerial.so (under windows it is rxtxSerial.dll) and copied it to java-7-openjdk-i386/jre/bin and it worked like a charm .

I hope this helps.

Answer 7

I was having the same problem even after installing the RXTXcomm.jar in the Java\jdk\lib directory. Based on the instructions at http://www.jcontrol.org/download/readme_rxtx_en.html I located the rxtxSerial.dll and the rxtxParallel.dll files. Placing them in the bin directory did not help, but placing them in the lib directory along with the RXTXcomm.jar solved the problem.

Answer 8

I had the same problem. So I installed JDK 32-bit and added those RxTx files(x86) to Program files(x86)/java/... folder instead of Program files/java... folder. Also I added those RxTx .dll files(x86) to /System32 folder. After that the problem was resolved in my application.