+ if (log.isTraceEnabled()) {
+ // print system properties
+ StringJoiner sb = new StringJoiner("\n");
+ for (Object key : new TreeMap<>(System.getProperties()).keySet()) {
+ sb.add(key + "=" + System.getProperty(key.toString()));
+ }
+ log.trace("System properties:\n" + sb + "\n");
+
+ }
+