https://github.com/aim42/htmlSanityCheck/issues/282

build.gradle

@@ -16,10 +16,6 @@ plugins {
     id 'groovy'
     id 'java'
     id "com.gradle.plugin-publish" version "0.9.10"
-
-    // to report build results back to gradle.org
-    id 'com.gradle.build-scan' version '2.2.1'
-
 }
 
 repositories {
@@ -29,21 +25,21 @@ repositories {
 
 dependencies {
 
-    testCompile(
+    testImplementation(
             'junit:junit:4.12',
             'org.spockframework:spock-core:1.2-groovy-2.5')
-
-    compile gradleApi()
 
-    compile group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.3'
+    implementation gradleApi()
+
+    implementation group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.3'
 
     // since gradle 4.6, annotation processors shall be explicitly declared
     // (instead of just having them in the compile-group)
     annotationProcessor 'org.apache.logging.log4j:log4j-core:2.3'
 
 
     // jsoup is our awesome html parser, see jsoup.org
-    compile group: 'org.jsoup', name: 'jsoup', version: '1.11.3'
+    implementation group: 'org.jsoup', name: 'jsoup', version: '1.11.3'
 
 
 } // dependencies

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

settings.gradle

@@ -1,6 +1,8 @@
-rootProject.name = 'htmlSanityCheck'
+plugins {
+    // to report build results back to gradle.org
+    id "com.gradle.enterprise" version "3.5.1"
+}
 
-enableFeaturePreview('STABLE_PUBLISHING')
+rootProject.name = 'htmlSanityCheck'
 
 include 'docToolchain'
-

src/main/groovy/org/aim42/htmlsanitycheck/HtmlSanityCheckTask.groovy

@@ -44,17 +44,17 @@ class HtmlSanityCheckTask extends DefaultTask {
 
     // configurable timeout for http-requests (used by @BrokenHttpLinksChecker)
     // defaults to 5000 (msecs)
-    @Optional
+    // java primitives must not be marked as @Optional
     @Input
     int httpConnectionTimeout = 5000
 
     // shall localhost-URLs lead to warnings?
-    @Optional
+    // java primitives must not be marked as @Optional
     @Input
     boolean ignoreLocalHost = false
 
     // shall numerical IP addresses lead to warnings?
-    @Optional
+    // java primitives must not be marked as @Optional
     @Input
     boolean ignoreIPAddresses = false