This is a follow-up commit on @07af5d41:
Inside org.aspectj.apache.bcel.util.ClassPath.getClassPath(), some JVM
version matching occurs which previously did not include Java 16 (I also
added 17-19 to the regex matcher). This fixes test errors like:

java.lang.ClassCastException:
  class org.aspectj.weaver.MissingResolvedTypeWithKnownSignature
  cannot be cast to class
  org.aspectj.weaver.ReferenceType
  (org.aspectj.weaver.MissingResolvedTypeWithKnownSignature and
  org.aspectj.weaver.ReferenceType are in unnamed module
  of loader 'app')

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Inside org.aspectj.apache.bcel.util.ClassPath.getClassPath(), some JVM
version matching occurs which previously did not include Java 15.
Technically, AspectJ 1.9.6 does not support Java 15, but on GitHub
Actions there is a build job running on a JVM 15. This change should at
least make the weaver tests pass, making that test job more meaningful.

This fixes test errors like

java.lang.ClassCastException:
  class org.aspectj.weaver.MissingResolvedTypeWithKnownSignature
  cannot be cast to class
  org.aspectj.weaver.ReferenceType
  (org.aspectj.weaver.MissingResolvedTypeWithKnownSignature and
  org.aspectj.weaver.ReferenceType are in unnamed module
  of loader 'app')

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Reports on declarations of Collection variables made by using the collection class as the type, rather than an appropriate interface.

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Reports common usage patterns of java.util.Map that could be replaced with Java 8 methods: getOrDefault(), computeIfAbsent(), putIfAbsent(), merge(), or replaceAll().

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Reports for loops which iterate over collections or arrays, and can be replaced with an enhanced for loop (i.e. the foreach iteration syntax).

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>