we normally use java -Xdebug -Xrunjdwp:transport=dt_socket,address=port,server=y,suspend=y,but weather it is possible to hack server when it start up ,add -Xdebug -Xrunjdwp:transport=dt_socket,address=ipv4\ipv6:port,server=n,suspend=y
as the client mode to connected to server? like a reverse shell?