From Java 8 to Java 17, there have been several improvements in the Java coding. However, Java 17 has been released on September 21, 2021, but there are several projects in the industry which are yet to be upgraded. Undoubtedly, it's not that much easy task for the big applications where in there are billions of lines of code. In this article, we will discuss about 'How to migrate from Java 8 to Java 17' & higher versions, especially the upgradation in source code. We will also explore the new features till Java 17 in comparison to Java 8 or earlier versions. Each feature will be demonstrated with an example in Java 8, followed by its equivalent implementation in Java 17. Some