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The further installation is explained in detail at http://www.lejos.org/nxt/nxj/tutorial/Preliminaries/GettingStarted.htm.

Do not forget to flash the download leJOS firmware to the Mindstorms brick as explained in the tutorial!

Known issues

Linux

On Linux there is an issue when uploading the firmware because of a kernel module (http://ubuntuforums.org/showthread.php?t=1123633). If you can't upload the firmware with your Linux OS, add blacklist cdc_acm at the very end of the file /etc/modprobe.d/blacklist.conf. Afterwards execute sudo rmmod cdc_acm. This will remove the cdc_acm module from the kernel and prevent its restart. Now try to flash the firmware again.

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IssueTypical Error MessagesDescriptionSolution
leJOS EV3 does not support Java 8

"java.lang.UnsupportedClassVersionError"

"unsupported major.minor version"

You compile the sources in your project with Java 8 and upload them to the brick. However the lejos EV3 does not support Java 8Go to the project properties and switch to Java 7 (Right Click on project > Properties > Java Compiler > Compiler compliance level)
Uploading to the brick does not respond You compile a file successfully and when uploading the result, the connected brick is found. Anyway the upload does not terminate and does not react.Flash the brick with the current leJOS firmware. If the brick is recognized correctly and the attempt to upload a compiled file fails then the firmware on the brick might be outdated.
Compilation and uploading works from command line but not when using KIELER

This Java instance does not support a 32-bit JVM. Please install the desired version.

You can compile and upload code to the brick using the command line tools but when using KIELER an error message apprears because Java does not support 32-bit JVM.Set the LEJOS_NXT_JAVA_HOME environment variable, such that it points to an 32-bit JDK and is visible for GUI applications (or at least KIELER). The process to do so differs on every OS. As alternative, execute KIELER from terminal.