MRAA with Java

[LLuca7]

Hi all,

I'm starting to program through the Linux and discovered the MRAA lib. I managed to install on the Debian Wheezy i'm using, and seems to work fine with C/C++, the examples I compiled and executed worked. But my goal in using MRAA is Java. But everything I try to compile/execute involving of mraa and java, doesnt work. Running pre-exported JARs I get this error: java.lang.UnsatisfiedLinkError: no mraajava in java.library.path. And compiling a .JAVA through javac it doesn't find the main class ( there IS a main class - code attached). Can someone help set up the lib to use with java projects?

PS: I used this guide http://iotdk.intel.com/docs/master/mraa/building.html mraa: Building libmraa to help me build the MRAA repository

EDIT: Updated the Test.java code

Message was edited by: Lucas Henrique

[idata · Accepted solution]

Hello lucas_hms,

Using the eglibc image (which can be found in https://software.intel.com/en-us/iot/hardware/galileo/downloads https://software.intel.com/en-us/iot/hardware/galileo/downloads) I was able to install Java on my Galileo and succesfully run the hello world example found in http://introcs.cs.princeton.edu/java/11hello/HelloWorld.java.html http://introcs.cs.princeton.edu/java/11hello/HelloWorld.java.html. I you are interested in the method I used to install Java, follow these steps:1. Go to the address /etc/opkg.2. Modify the files iotdk.conf and mraa-upm.conf so they have the following content:iotdk.conf :src iotdk-i586 http://iotdk.intel.com/repos/3.0/iotdk/i586/ http://iotdk.intel.com/repos/3.0/iotdk/i586/src iotdk-intel-core-2-32 http://iotdk.intel.com/repos/3.0/iotdk/intel_core2_32/ http://iotdk.intel.com/repos/3.0/iotdk/intel_core2_32/src iotdk-quark http://iotdk.intel.com/repos/3.0/iotdk/quark/ http://iotdk.intel.com/repos/3.0/iotdk/quark/src iotdk-x86 http://iotdk.intel.com/repos/3.0/iotdk/x86/ http://iotdk.intel.com/repos/3.0/iotdk/x86/src iotdk-core-2-32 http://iotdk.intel.com/repos/3.0/iotdk/core2-32/ http://iotdk.intel.com/repos/3.0/iotdk/core2-32/mraa-upm.conf:src mraa-upm http://iotdk.intel.com/repos/3.0/intelgalactic/opkg/i586/ http://iotdk.intel.com/repos/3.0/intelgalactic/opkg/i586/3. Type the command opkg update and let it update the repos on board.4. Install the latest version available of mraa, upm and Java with the follwing command:opkg install mraa upm openjdk-8-common openjdk-8-demo openjdk-8-doc openjdk-8-java openjdk-8-jdk openjdk-8-jre openjdk-8-sourceNow you should be able to use Java on your Galileo, let me know if this helps you.Peter.