i installed this feature in a fresh instance of eclipse me galileo, 
windows vist 32 bit. 
first of all, the entry "generate unicase url" is available, even when 
nothing is selected. 
upon clicking it, an entry "unhandled event loop exception" appears in 
the error log: 
java.lang.nullpointerexception 
        at 
org.unicase.openurl.handlers.unicaseopenurlhandler.execute(unicaseopenurlhandler.java: 
53) 
        at 
org.eclipse.ui.internal.handlers.handlerproxy.execute(handlerproxy.java: 
294) 
        at org.eclipse.core.commands.command.executewithchecks(command.java: 
476) 
        at 
org.eclipse.core.commands.parameterizedcommand.executewithchecks(parameterizedcommand.java: 
508) 
        at 
org.eclipse.ui.internal.handlers.handlerservice.executecommand(handlerservice.java: 
169) 
        at 
org.eclipse.ui.internal.handlers.slavehandlerservice.executecommand(slavehandlerservice.java: 
241) 
        at 
org.eclipse.ui.internal.handlers.slavehandlerservice.executecommand(slavehandlerservice.java: 
241) 
        (...) 
the same error-message appears when trying to "generate unicase url" 
on (any) project or on model elements of local created projects. 
this feature only worked for me, when using it on a checked out 
project's model elements (in my case supermarketexampleproject). 
the url is correctly copied to the clipboard and appears in a little 
window. 
however, i also wasn't able to use this link due to missing protocol 
registration.