In my XPages application, I want to debug a problem related to javax.net. Therefore I set the system property javax.net.debug=all. Unfortunately, the debug information is not written to the Domino server console and I cannot find it in any of the logs on the server.
Can anybody tell me how to get that debug output?
1) In your Notes.ini, create an entry for an options file, i.e.
JavaOptionsFile=C:\IBM\Domino9\MyJavaOptions.txt
2) Create this file and add this line
-Djavax.net.debug=all
3) Save it & restart the server
4) Open log.nsf to see what happens - the server console is no longer useable, too much debug information!
- Add to entry
javax.net.debug=allto file\Domino\data\domino\workspace\.config\rcpinstall.properties - Restart server
来源：https://stackoverflow.com/questions/40802850/debug-information-for-javax-net-is-not-written-to-domino-server-console