Remote debug Wildfly with Eclipse

./standalone.bat --debug

This generates


JAVA_OPTS: "-Dprogram.name=standalone.bat -Xms64M -Xmx512M -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=n"

===============================================================================

Listening for transport dt_socket at address: 8787



In fact, in standalone.bat you find this code:

rem Set debug settings if not already set
if "%DEBUG_MODE%" == "true" (
   echo "%JAVA_OPTS%" | findstr /I "\-agentlib:jdwp"> nul
  if errorlevel == 1 (
     set "JAVA_OPTS=%JAVA_OPTS% -agentlib:jdwp=transport=dt_socket,address=%DEBUG_PORT_VAR%,server=y,suspend=n"
  ) else (
     echo Debug already enabled in JAVA_OPTS, ignoring --debug argument
  )
)

You can now follow these instructions https://www.eclipse.org/jetty/documentation/9.4.x/debugging-with-eclipse.html to configure Eclipse,
or simply

right-click on project in eclipse, Debug as, Remote Java Application, then you get this dialog


so I can trace this code:



public String getPrincipalName(HttpServletRequest request) {
KeycloakPrincipal keycloakPrincipal = (KeycloakPrincipal)request.getUserPrincipal();
return keycloakPrincipal != null ? keycloakPrincipal.getKeycloakSecurityContext().toString() : "unauthenticated" ;
}


and discover this: