This is certainly strange, it may be that avast doesn't like the redirect. Or something to do with JAVA, I have long since abandoned JAVA as it is such a huge target for malware attack.
Do you actually have JAVA installed and more importantly do you actually use it ?
Websites have pretty much stopped using it, but some programs are JAVA based or require it. I don't know if it is a legitimate call to update the JAVA Runtime Environment (JRE), or if this is what avast is concerned with.