If the indexUrlString that is used in JandexIndexBeanArchiveHandler.loadJandexIndex(String s) contains a '%' sign, an IllegalArgumentException is thrown.

Having a '%' in an URL that is not meant to escape some character (like %20 for space) is totally fine both on Windows and Unix machines.
Because executing the openStream method of a java.net.URL leads to execution of sun.net.www.ParseUtil.decode(String s) which expects an encoded URL string.

Therefore, the URL should be encoded (possibly by using the java.net.URLEncoder) before trying to call the openStream method.

I found another Issue with a similar title but missing description: https://issues.jboss.org/browse/WELD-1987