"Ill-advised or mistaken usage of a core class" error when adding xml-apis-1.4.01.jar as a dependency

Question

I am trying to use HtmlUnit which lists xml-apis-1.4.01.jar as a dependency. Though whenever I include this file in the libs/ directory I get the following error:

Error: trouble processing "javax/xml/XMLConstants.class":
Error: Ill-advised or mistaken usage of a core class (java.* or javax.*)
...

Could anyone help me resolve this.

Thanks!

Answer 1

First of all, don't put .jars into libs folder, as you will quickly run into dependency hell. Use gradle build system for that. In your app module build.gradle file declare such dependency:

compile ('net.sourceforge.htmlunit:htmlunit:2.23') {
    exclude module: 'commons-logging'
    exclude module: 'httpclient'
}

And everything will build correctly.