Oracle JDeveloper 11.1.2.1
When JDeveloper closes unexpected without shutting down IntegratedWebLogicServer, trying to start IntegratedWLS next time, gives “Unable to reserve the .lok file for Integrated WebLogic Server (IntegratedWebLogicServer).”
First Solution is to kill the process in Task Manager. Open Task Manager & check for java.exe process for higher memory consumption. End the process.
IF above does not help then go to C:\Users\RRA\AppData\Roaming\JDeveloper\system11.1.2.1.38.60.81\DefaultDomain . Delete the edit.lok file.
http://adfblogspot.blogspot.com/2012/11/unable-to-reserve-lok-file-for.html