KIELER Project


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The setup.exe of the current LEGO Fantom driver for Windows (1.2.0) has an awkward issue. If you get an error message (Developer Error) because an .msi file could not be found, don't panic. The file is part of the downladed archive (in the Products folder) but you have to start it manually.Installing

If you get a runtime error when starting the ssetup.exe also don't panic. The file is part of the downladed archive (in the Products folder) but you have to start it manually.

If installing the fantom driver fails or does not work , but a connection try to connect via bluetooth works.

Mac OS X

The leJOS NXJ tools require a 32 Bit version of Java. However, newer 32 Bit versions of Java are not longer available for Mac. Thus to use leJOS the installation of Java 1.6 is required, which is the last one that supports a 32 Bit mode. You can download the installer for Java 1.6 from https://support.apple.com/kb/dl1572?locale=en_US. It will install Java 1.6 to /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home so that the environment variable LEJOS_NXT_JAVA_HOME, which is set in the installation instructions, points to the correct path.

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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

TODO not the only reason


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brick is recognized correctly and the attempt to upload a compiled file fails then the firmware on the brick might be outdated. If connecting via bluetooth works add -b to the uxjupload/nxj command.
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.
Brick does nothing after program finished and prints "Program exit"
A program was uploaded and finished without errors. Afterwards the brick prints "Program exit" but does not open the main menu.

This is normal behaviour if uploading a program in debug mode instead run mode (Debug As instead Run As in Eclipse). To get back to the main menu, press the ENTER and ESCAPE button of the brick at the same time.

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