This is jdb version 1.8 (Java SE version 1.8.0_131)

invalid option: --help Usage: jdb <options> <class> <arguments> where options include: -help print out this message and exit -sourcepath <directories separated by ":"> directories in which to look for source files -attach <address> attach to a running VM at the specified address using standard connector -listen <address> wait for a running VM to connect at the specified address using standard connector -listenany wait for a running VM to connect at any available address using standard connector -launch launch VM immediately instead of waiting for 'run' command -listconnectors list the connectors available in this VM -connect <connector-name>:<name1>=<value1>,... connect to target VM using named connector with listed argument values -dbgtrace [flags] print info for debugging jdb -tclient run the application in the HotSpot(TM) Client Compiler -tserver run the application in the HotSpot(TM) Server Compiler options forwarded to debuggee process: -v -verbose[:class|gc|jni] turn on verbose mode -D<name>=<value> set a system property -classpath <directories separated by ":"> list directories in which to look for classes -X<option> non-standard target VM option <class> is the name of the class to begin debugging <arguments> are the arguments passed to the main() method of <class> For command help type 'help' at jdb prompt