trouble using java lib

[meza]

Hi, I'm trying to us the java library. I've added the jar to my classpath, and set the LD_LIBRARY_PATH to point to the libBlink1.so's directory.

Now when I start using my device, I get this:

blink1/libraries/libBlink1.so: undefined symbol: hid_enumerate

[meza]

[blink1/libraries]$ export LD_LIBRARY_PATH=. && java -jar blink1.jar

even this produces the same

[todbot]

Hi Maza, Take a look at the shell script: https://github.com/todbot/blink1/blob/master/java/blink1-tool-java.sh for an example of how to set up the various paths.

Also, if you are on Linux, you will probably need to rebuild libBlink1.so by doing a "make compile" and "make jar" in blink1/java

[meza]

Hey,

Even the script does the same thing before and after rebuilding the so. :(

On 1 Feb 2013 19:51, "Tod E. Kurt" notifications@github.com wrote:

Hi Maza, Take a look at the shell script: https://github.com/todbot/blink1/blob/master/java/blink1-tool-java.sh for an example of how to set up the various paths.

Also, if you are on Linux, you will probably need to rebuild libBlink1.so by doing a "make compile" and "make jar" in blink1/java

— Reply to this email directly or view it on GitHubhttps://github.com/todbot/blink1/issues/40#issuecomment-13010925.

[todbot]

The Java wrapper under Linux hasn't been tested very extensively. We would appreciate any insight from people who have experience with Java on Linux.

[meza]

I'll happily help once we solve this :)

Marton Meszaros +447523539825 www.meza.hu skype: vsb-meza

(The email has been sent from my phone. I am on the go, so my reply time may vary.) On 1 Feb 2013 21:21, "Tod E. Kurt" notifications@github.com wrote:

The Java wrapper under Linux hasn't been tested very extensively. We would appreciate any insight from people who have experience with Java on Linux.

— Reply to this email directly or view it on GitHubhttps://github.com/todbot/blink1/issues/40#issuecomment-13012189.

[fredg02]

Hi, I've found a way to get this working:

1. cd blink1/commandline/hidapi/libusb
2. make -f Makefile.linux
3. copy the newly created libhidapi-libusb.so to your lib dir
4. export LD_LIBRARY_PATH=
5. export LD_PRELOAD=/libhidapi-libusb.so
6. run you java program

It's just a workaround and hopefully not needed once we figure how it's done the right way, but it works.

HTH,

Fred

[todbot]

Thanks, Fred, this is extremely useful. I haven't had to use LD_PRELOAD in like a decade, I forget how it's different from LD_LIBRARY_PATH

Which distro of Linux did you do this on?

[todbot]

I updated the Java/Processing library zip bundle at: http://thingm.com/blink1/downloads/blink1-java-processing-lib.zip that should now out-of-the box for Linux.

If you are using this directly from java, just point your LD_LIBRARY_PATH and to the unzipped directory and add the blink1.jar to your jar path. On the command line, this looks something like:

unzip blink1-java-processing-lib.zip
export BLINK1LIB=`pwd`/blink1-java-processing-lib/blink1/library
java -Djava.awt.headless=true -Djava.library.path=${BLINK1LIB} ${BLINK1LIB}/blink1.jar MyTestClass

[reiabreu]

Hi, Tod. The new Java/Processing library zip worked for me. Thank you.

[fredg02]

I'm still running Kubuntu 10.04.04 LTS.