Failed to transfer file: http://repo1.maven.org/maven2. Return code is: 501 , ReasonPhrase:HTTPS Required

If you are getting the following error when you are building your Java project using maven or gradle:

Failed to transfer file: http://repo1.maven.org/maven2. 

Return code is: 501 , ReasonPhrase:HTTPS Required

And you are thinking what happened, I haven’t changed anything in my project, no new dependencies, or repositories. The answer is that you haven’t changed anything. 

Do not panic! Effective January 15, 2020, the Central Repository is not longer supporting communication over HTTP and it requires requests to the repository must be over HTTPS.

Latency for sharing data while using Hazelcast on Virtual Machine

A few days back we found out one old app which was running on multiple nodes while having in-memory cache usage. So, as a result, there was a case when the request came to the first node and the second node didn't get that data, and the app wasn't functioning properly. 

So, as always first thing which we considered to use Redis. However, we don't have ready to use the Redis cluster and we started looking for other solutions in a market. Finally, I saw there is a Hazelcast which allows sharing data between nodes even without having the Hazelcast cluster. Of course, it is working when you are running in the same network. So, nodes should be able to multicast and make a proper cluster.