API of JSR-356 Drafts (will switch to official version when available on maven central)
'org.eclipse.jetty.drafts:javax.websocket-api:0.0.006.draft'
<dependency>
<groupId>org.eclipse.jetty.drafts</groupId>
<artifactId>javax.websocket-api</artifactId>
<version>0.0.006.draft</version>
</dependency>
<dependency org="org.eclipse.jetty.drafts" name="javax.websocket-api" rev="0.0.006.draft"/>
"org.eclipse.jetty.drafts", "javax.websocket-api", "0.0.006.draft"