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Try to run generated JAR by Mobility plugin file instead of JAD file. As the result application is not started and the following error message is printed by ME SDK 8: "Application cannot be installed because MicroEdition-Profile attribute is missing from the application descriptor file (.jad)" The reason is in typo in manifest file. Manifest contains "Microedition-Profile" attribute instead of "MicroEdition-Profile" (one letter has wrong case).
fixed in jet-main: http://hg.netbeans.org/jet-main/rev/b86ce2e1c50c (root cause of this issue was probably in enhancement request bug #230689, where it was written with small "e" and I've copied that string from there)
Verified on 201401150002 build.