Why Am I Seeing the Error Message "Javadoc generation failed"?

Symptoms

The Gradle performs the javadoc check during a build. Therefore, the error Javadoc generation failed may be reported.

Solution

To avoid javadoc check, add the following configuration to Gradle in the root directory of the project:

allprojects {
repositories {
jcenter()
}
tasks.withType(Javadoc) {
options.addStringOption('Xdoclint:none', '-quiet')
options.addStringOption('encoding', 'UTF-8')
}
}