java - Eclipse javax.websocket import not resolved -

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i'm new java development (using speeding real-time game server, coming python).

i'm trying add basic java server-side websockets, , added simplest example code found (from websockets production ready server in java?).

i'm importing following:

enter image description here

my problem is, eclipse telling me import "javax.websocket" cannot resolved. can add "javax" module? don't understand complicated interface yet, lot help! (i've got latest eclipse, java 8 installed on mac os x 10.11 latest)

do use jdk or java ee? javax.websocket in java ee.


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