<dependency>
  <groupId>org.eclipse.jdt.core.compiler</groupId>
  <artifactId>ecj</artifactId>
  <version>4.2.1</version>
</dependency>

implementation 'org.eclipse.jdt.core.compiler:ecj:4.2.1'

implementation("org.eclipse.jdt.core.compiler:ecj:4.2.1")

libraryDependencies += "org.eclipse.jdt.core.compiler" % "ecj" % "4.2.1"

@Grapes(
  @Grab(group='org.eclipse.jdt.core.compiler', module='ecj', version='4.2.1')
)

<dependency org="org.eclipse.jdt.core.compiler" name="ecj" rev="4.2.1" />

[org.eclipse.jdt.core.compiler/ecj "4.2.1"]

'org.eclipse.jdt.core.compiler:ecj:jar:4.2.1'