ERROR: transport error 202: gethostbyname: unknown host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [debugInit.c:750]

This error can be mostly seen in mac environment when you try to run server in eclipse debug mode.

solution:
you need map 127.0.0.1 to localhost in /etc/hosts

vi /etc/hosts

comment:
::1 localhost

add
127.0.0.1 localhost

Thanks for referring techiehints.