Possible fix #2765: Add task to download package-list file from java as element-list

build.gradle

@@ -25,6 +25,7 @@ plugins {
     id 'com.github.ben-manes.versions' version '0.42.0'
     id 'biz.aQute.bnd.builder' version '6.3.1'
     id 'ru.vyarus.animalsniffer' version '1.5.2'
+    id 'de.undercouch.download' version '5.3.0'
 }
 
 description = 'Mockito mock objects library core API and implementation'

gradle/mockito-core/javadoc.gradle

@@ -38,8 +38,8 @@ javadoc {
     options.noIndex = false
     options.noNavBar = false
     options.noTree = false
-    options.links = ['https://docs.oracle.com/javase/6/docs/api/',
-                     'https://junit.org/junit4/javadoc/4.12/']
+    options.links('https://junit.org/junit4/javadoc/4.12/')
+    options.linksOffline('https://docs.oracle.com/javase/6/docs/api/', "$buildDir/javase-6-docs/")
     options.bottom("""
         <script type="text/javascript" src="{@docRoot}/js/jdk6-project-version-insert.min.js"></script>
         <script type="text/javascript" src="{@docRoot}/js/jquery-1.7.min.js"></script>
@@ -52,6 +52,23 @@ javadoc {
     options.addStringOption('Xwerror', '-quiet')
     options.addBooleanOption('-allow-script-in-comments', true)
 
+    // attempt to fix https://github.com/mockito/mockito/issues/2765
+    doFirst {
+        download.run {
+            src 'https://docs.oracle.com/javase/6/docs/api/package-list'
+            // somehow downloading src/javadoc or buildDir/javadoc didn't work, probably something related to the folder
+            // lifecycle
+            dest "$buildDir/javase-6-docs/element-list"
+            overwrite true
+        }
+        // dumbly downloading again just to see if we can make all jdks happy
+        download.run {
+            src 'https://docs.oracle.com/javase/6/docs/api/package-list'
+            dest "$buildDir/javase-6-docs/package-list"
+            overwrite true
+        }
+    }
+
     doLast {
         copy {
             from "src/javadoc"