<dependency>
  <groupId>com.google.protobuf</groupId>
  <artifactId>protobuf-java</artifactId>
  <version>2.1.0</version>
</dependency>

implementation 'com.google.protobuf:protobuf-java:2.1.0'

implementation("com.google.protobuf:protobuf-java:2.1.0")

libraryDependencies += "com.google.protobuf" % "protobuf-java" % "2.1.0"

@Grapes(
  @Grab(group='com.google.protobuf', module='protobuf-java', version='2.1.0')
)

<dependency org="com.google.protobuf" name="protobuf-java" rev="2.1.0" />

[com.google.protobuf/protobuf-java "2.1.0"]

'com.google.protobuf:protobuf-java:jar:2.1.0'