Apply javadoc fix tool to your Gradle build

build.gradle

// Copy JavadocFixTool.java into buildSrc/src/main/java

// this will apply the javadoc fix tool to all generated javadocs
// we use it to make sure that the javadocs are not vulnerable independently of the JDK used to build
allprojects {
    tasks.withType(Javadoc).all {
        doLast {
            def javadocFix = new JavadocFixTool()
            javadocFix.recursive = true
            javadocFix.doPatch = true
            javadocFix.searchAndPatch(destinationDir)
        }
    }
}

Note that groovydoc has the same problem so if you use it, you should do:

allprojects {
    [Javadoc, Groovydoc].each {
        tasks.withType(it).all {
            doLast {
                def javadocFix = new JavadocFixTool()
                javadocFix.recursive = true
                javadocFix.doPatch = true
                javadocFix.searchAndPatch(destinationDir)
            }
        }
    }
}

JavaDocTool.java can be downloaded from http://www.oracle.com/technetwork/java/javase/downloads/java-doc-updater-tool-1955731.html

Now you can use the plugin: https://github.com/melix/gradle-javadoc-hotfix-plugin