This failure indicates that the java.nio.file.Files class does not have a readString (Path, Charset) method. That method was added in Java 11. We can see that @GaneshKaparapu is using java-1.8.0, ...
Operating System: Windows 10 JDK version: 17.0.1 Visual Studio Code version: 1.62.3 Java extension version: 1.1.0 at C:\Users\Username\.vscode\extensions\redhat.java-1.1.0\dist\extension.js:2:801280 ...