iReport not working

Hi, after changing my computer I could not run iReport on my ubuntu in versions 4.5.1, 4.6.0 and 5.6.0 . There was no errors even in console. The problem was with java version. My default was 8.0. The most important was to change javac version to lower(I choose 6.0)

sudo update-alternatives --config javac

but I changed also java version

sudo update-alternatives --config java

Hope it saves you few minutes. Leave me a comment if it helps