<dependency>
  <groupId>org.webjars.bowergithub.twbs</groupId>
  <artifactId>bootstrap</artifactId>
  <version>4.2.1</version>
</dependency>

implementation 'org.webjars.bowergithub.twbs:bootstrap:4.2.1'

implementation("org.webjars.bowergithub.twbs:bootstrap:4.2.1")

libraryDependencies += "org.webjars.bowergithub.twbs" % "bootstrap" % "4.2.1"

@Grapes(
  @Grab(group='org.webjars.bowergithub.twbs', module='bootstrap', version='4.2.1')
)

<dependency org="org.webjars.bowergithub.twbs" name="bootstrap" rev="4.2.1" />

[org.webjars.bowergithub.twbs/bootstrap "4.2.1"]

'org.webjars.bowergithub.twbs:bootstrap:jar:4.2.1'