The only way to supress echo is to use "C" libary of AEC and call it from Java. AEC is a very computationally extensive algorithm and only "C" code allows optimization under your platform. Commercial optimized AEC can be found for example here IntegrIT. Btw, AEC will work properly provided you have done proper integration with audio drivers...
Without forming any opinion on the technical content of the answer, I viewed it as a valid answer (albeit perhaps lacking thorough detail) and clicked "Looks Good". In response, I saw the following banner:
This post has severe quality issues.
It is abusive nonsense, noise, spam, blatantly off-topic or otherwise irredeemable - readers will find it offensive or repulsive rather than helpful. You should delete or recommend deletion when reviewing such posts.
Don't worry, we've already handled this post appropriately - but please take a minute to look it over closely, keeping in mind the guidance shown above.
In what way is the post "abusive nonsense", "noise", "spam", "blatantly off-topic" or "otherwise irredeemable"? In what way will readers find it "offensive" or "repulsive"?
Should one really "recommend deletion when viewing such posts"? I'm not entirely sure how to differentiate between "such posts" and 99% of the posts on SO. Grateful for some guidance!