<dependency>
  <groupId>com.vaadin.external.slf4j</groupId>
  <artifactId>vaadin-slf4j-jdk14</artifactId>
  <version>1.6.1</version>
</dependency>

implementation 'com.vaadin.external.slf4j:vaadin-slf4j-jdk14:1.6.1'

implementation("com.vaadin.external.slf4j:vaadin-slf4j-jdk14:1.6.1")

libraryDependencies += "com.vaadin.external.slf4j" % "vaadin-slf4j-jdk14" % "1.6.1"

@Grapes(
  @Grab(group='com.vaadin.external.slf4j', module='vaadin-slf4j-jdk14', version='1.6.1')
)

<dependency org="com.vaadin.external.slf4j" name="vaadin-slf4j-jdk14" rev="1.6.1" />

[com.vaadin.external.slf4j/vaadin-slf4j-jdk14 "1.6.1"]

'com.vaadin.external.slf4j:vaadin-slf4j-jdk14:jar:1.6.1'