The LoggerContext.getFrameworkPackages documentation says this is a list of packages (including their subpackages) that get excluded when tracing the caller.
But the implementation in CallerData.isInFrameworkSpaceList is wrong because "com.foo" matches "com.foobar" which is not its subpackage.

I suggest changing

if (currentClass.startsWith(s))

to

if (currentClass.startsWith(s + "."))

or even

if (currentClass.equals(s) || currentClass.startsWith(s + "."))

in case someone relies on this behavior to exclude specific classes (which would be nice anyway).

We could also add

if (s.equals("")) return !currentClass.contains(".")

to support excluding the default package classes.