JOSM does not give a message to the user when running out of memory
In the past when JOSM ran out of memory, you got a popup message. That does not happen anymore, JOSM just starts behaving weird (as it runs out of memory) and only displays a message "java.lang.OutOfMemoryError: unable to create new native thread" etc. in the console.
JOSM should give a message to the user too.
JOSM v11427, java 1.8.0_111 on Windows 7