Has a trial version of server 12 ever been previously installed on this computer?
I installed FileMaker Server 12.04 and tried launch admin console. It displayed a java error. I searched for a solution for that error in FileMaker website and found the solution as upgrading it to 12.05. I upgraded it to 12.05 and tried to lanch the admin console, I didn't get any java error but it asking for license key. The java version on my PC at that time is Java 7 Updte 51. I uninstalled both FileMaker Server 12.05 and Java 7 Update 51completely and searched for a java version that is compatible with FileMaker Server 12.04. Now I reinstalled FileMaker server 12.04 and compatible java version which is Java 6 Update 45 and tried launch the adminconsole. Now I didn't get any java error but it is still asking for license key.