javac source and target options

Question

I have seen the compile options like discussed in Which JDK's distributions can run `javac -source 1.6 -target 1.5`?. I understand the individual options for source and

Answer 1

JDK1.8 will no longer support -source and -target less than 1.6

"c:\Program Files\Java\jdk1.8.0_121\bin\javac.exe" -source 1.3 HelloWorld.java
warning: [options] bootstrap class path not set in conjunction with -source 1.3
warning: [options] source value 1.3 is obsolete and will be removed in a future release
warning: [options] target value 1.4 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
4 warnings