Need to get a heap dump from a running app (tomcat) on JDK 1.702. Kill -3 does trigger some info to catalina.out but does not produce heap dump. Added -XX:+HeapDumpOnCtrlBreak and got
The -XX options are developer options and are subject to change between versions without any notice. It could have been dropped.
Application servers like JBOSS and Weblogic provide options to obtain thread dumps. You can try those servers if that is an option. Else you should be able to use JMX beans and JConsole to get the thread dumps. Someone has spent time writing a java class that pokes these beans -