JEP: https://openjdk.org/jeps/400

From the JEP text, the following APIs use the default charset which is changing from being platform dependent to defined as UTF-8:

```

• In the java.io package, InputStreamReader, FileReader, OutputStreamWriter, FileWriter, and PrintStream define constructors to create readers, writers, and print streams that encode or decode using the default charset.

• In the java.util package, Formatter and Scanner define constructors whose results use the default charset.

• In the java.net package, URLEncoder and URLDecoder define deprecated methods that use the default charset.

```
When
A Java class references one of these apis:
java.io.InputStreamReader.InputStreamReader(InputStream)
java.io.FileReader.FilerReader(File)
java.io.FileReader.FilerReader(FileDescripter)
java.io.FileReader.FilerReader(String)
java.io.OutputStreamWriter(OutputStream)
java.io.FileWriter.FileWriter(File)
java.io.FileWriter.FileWriter(File, boolean)
java.io.FileWriter.FileWriter(FileDescripter)
java.io.FileWriter.FileWriter(String)
java.io.FileWriter.FileWriter(String, boolean)
java.io.PrintStream.PrintStream(File)
java.io.PrintStream.PrintStream(OutputStream)
java.io.PrintStream.PrintStream(OutputStream, boolean)
java.io.PrintStream.PrintStream(String)
java.util.Formatter.Formatter()
java.util.Formatter.Formatter(File)
java.util.Formatter.Formatter(OutputStream) 
java.util.Formatter.Formatter(PrintStream)
java.util.Formatter.Formatter(Appendable)
java.util.Formatter.Formatter(FileName)
java.util.Scanner.Scanner(File)
java.util.Scanner.Scanner(InputStream)
java.util.Scanner.Scanner(Readable)
java.util.Scanner.Scanner(String)
java.util.Scanner.Scanner(ReadableByteChannel)
java.util.Scanner.Scanner(Path)
java.net.URLEncoder.encode(String)
java.net.URLDecoder.decode(String)

Perform
add a hint advising that the default charset has changed from the Platform default to be UTF8.