<dependency>
  <groupId>org.eclipse.jdt</groupId>
  <artifactId>ecj</artifactId>
  <version>3.21.0</version>
</dependency>

implementation 'org.eclipse.jdt:ecj:3.21.0'

implementation("org.eclipse.jdt:ecj:3.21.0")

libraryDependencies += "org.eclipse.jdt" % "ecj" % "3.21.0"

@Grapes(
  @Grab(group='org.eclipse.jdt', module='ecj', version='3.21.0')
)

<dependency org="org.eclipse.jdt" name="ecj" rev="3.21.0" />

[org.eclipse.jdt/ecj "3.21.0"]

'org.eclipse.jdt:ecj:jar:3.21.0'