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This instruction launches the VM with the
-agentlib:jdwp=transport=dt_socket,server=y,address=<address>,suspend=y
command line argument.
The socket transport address can include a host name (or IP address) and a port. For example:
-runjdb: localhost:10001
The socket transport address can be just a port number. For example:
-runjdb: 10001
Note: Starting with Java 9, using just a port number means that the launched VM will only listen on localhost for the connection. If you want to remote debug, you will need to specify a host name (or IP address), or an asterisk (*) to accept from any host. For example:
-runjdb: *:10001
If the socket transport address starts with a minus sign (-), then the launched VM is not suspended: suspend=n. The minus sign is removed from the socket transport address before it is used for the address option.
If the specified socket transport address is not a port number or a host:port value, then the address 1044 is used.