<dependency>
  <groupId>org.apache.tomcat</groupId>
  <artifactId>tomcat-websocket-api</artifactId>
  <version>9.0.12</version>
</dependency>

implementation 'org.apache.tomcat:tomcat-websocket-api:9.0.12'

implementation("org.apache.tomcat:tomcat-websocket-api:9.0.12")

libraryDependencies += "org.apache.tomcat" % "tomcat-websocket-api" % "9.0.12"

@Grapes(
  @Grab(group='org.apache.tomcat', module='tomcat-websocket-api', version='9.0.12')
)

<dependency org="org.apache.tomcat" name="tomcat-websocket-api" rev="9.0.12" />

[org.apache.tomcat/tomcat-websocket-api "9.0.12"]

'org.apache.tomcat:tomcat-websocket-api:jar:9.0.12'