Docs: add AspectJ Java version compatibility table

Signed-off-by: Alexander Kriegisch <[email protected]>

Author: kriegaex

README.md

@@ -45,6 +45,7 @@ Ensure you run this with a JDK - the more recent the better since some tests wil
 * [Getting started with AspectJ](https://www.eclipse.org/aspectj/doc/released/progguide/starting.html)
 * [Programming Guide](https://www.eclipse.org/aspectj/doc/released/progguide/index.html)
 * [READMEs for each version of AspectJ](docs/dist/doc)
+* [AspectJ Java version compatibility](docs/dist/doc/JavaVersionCompatibility.md)
 
 ## Documentation for AspectJ developers
 

docs/dist/doc/JavaVersionCompatibility.md

@@ -0,0 +1,23 @@
+# AspectJ Java version compatibility
+
+For reasons described e.g. in [this comment](https://github.com/eclipse/org.aspectj/issues/139#issuecomment-1072946123),
+for AspectJ users it has become a little challenging to find out which minimum AspectJ version is required in order to
+process byte code or compile source using features of a certain Java language version. Since Java 10, this cannot be
+easily concluded from the AspectJ version number anymore, and we are sorry for that. So here is a little overview:
+
+AspectJ version | Java version | Comments
+----------------|--------------|--------
+1.9.8 | 17 | AspectJ compiler requires JDK 11+ during build time. During runtime, AspectJ still only requires Java 8+ for both compile-time and load-time weaving. Pure Java code can be compiled down to as old as 1.3 byte code level.
+1.9.7 | 15, 16
+1.9.6 | 14
+1.9.5 | 13
+1.9.3 - 1.9.4 | 12
+1.9.2 | 11
+1.9.1 | 10
+1.9.0 | 9
+1.8.0 - 1.8.14 | 8
+1.7.0 - 1.7.4 | 7
+1.6.0 - 1.6.12 | 6
+1.5.0 - 1.5.4 | 5
+
+Older versions omitted.