Can you please tell what has to be coded in alternateLanguageLinks method. I have imported the locale utility.

Should i use the com.adobe.aem.wcm.seo package for java implementation or java.util.Locale itself is enough

Can you help me to implement hreflang. this is the exact functionality i'm looking for. OOTB code given in adobe github is not returning any value.Should i use sitemap or the code itself is enough.is com.adobe.aem.wcm.seo package needed to implement it? 

Was the problem sorted out?

Did anyone figure out the problem?