Some code comments to fill in gaps.

src/main/javassist/util/proxy/SecurityActions.java

@@ -36,6 +36,18 @@ import javassist.bytecode.ClassFile;
 class SecurityActions extends SecurityManager
 {
     public static final SecurityActions stack = new SecurityActions();
+    /**
+     * Since Java 9 abruptly removed <code>Reflection.getCallerClass()</code>
+     * in favour of <code>StackWalker</code> we are left having to find a
+     * solution for the older versions without upsetting the new compiler.
+     *
+     * The member scoped function <code>getClassContext()</code>
+     * available as a <code>SecurityManager</code> sibling remains
+     * functional across all versions, for now.
+     *
+     * @return represents the declaring class of the method that invoked
+     *         the method that called this or idx 2 on the stack trace.
+     * @since 3.23 */
     public Class<?> getCallerClass()
     {
         return getClassContext()[2];
@@ -207,6 +219,18 @@ class SecurityActions extends SecurityManager
             throw new RuntimeException(e.getCause());
         }
     }
+    /**
+     * _The_ Notorious sun.misc.Unsafe in all its glory, but anonymous
+     * so as not to attract unwanted attention. Kept in two separate
+     * parts it manages to avoid detection from linker/compiler/general
+     * complainers and those. This functionality will vanish from the
+     * JDK soon but in the meantime it shouldn't be an obstacle.
+     *
+     * All exposed methods are cached in a dictionary with overloaded
+     * methods collected under their corresponding keys. Currently the
+     * implementation assumes there is only one, if you need find a
+     * need there will have to be a compare.
+     * @since 3.23 */
     class TheUnsafe
     {
         final Class<?> unsafe;
@@ -243,6 +267,12 @@ class SecurityActions extends SecurityManager
             return null;
         }
     }
+    /**
+     * Java 9 now complains about every privileged action regardless.
+     * Displaying warnings of "illegal usage" and then instructing users
+     * to go hassle the maintainers in order to have it fixed.
+     * Making it hush for now, see all fixed.
+     * @param tu theUnsafe that'll fix it */
     static void disableWarning(TheUnsafe tu) {
         try {
             if (ClassFile.MAJOR_VERSION < ClassFile.JAVA_9)