matlab2015a only can be used as nodesktop environment

hi: the computer I used is dell T630, and the system is fedora 21 x64. when I start matlab 2015a on my computer, I can only start it using command './matlab -nodesktop'.But when I used './matlab' directly, it stays in a initial blue window..why? Thanks a lot!

[Lion]

I have checked the java version in matlab without desktop, it shows the same version as the linux system. when start with desktop, it shows a warnning, 'OpenJDK 64-bit server VM warning', ignoring option MaxPermSize=128m, support was removed in 8.0