code: protected void processContextEntry(ServiceReference<JAASLoginContextEntry> ref) {
          String id = (String) ref.getProperty(KEY_ID);
          String[] modulePids = (String[]) ref.getProperty(JAASLoginContextEntryImpl.CFG_KEY_LOGIN_MODULE_REF);
  
          boolean changedEntryContext = false;
          if (modulePids == null || modulePids.length == 0) {
              Tr.error(tc, "JAAS_LOGIN_CONTEXT_ENTRY_HAS_NO_LOGIN_MODULE", id);
              changedEntryContext |= jaasLoginContextEntries.removeReference(id, ref);
          } else {
              if (haveAllModules(modulePids)) {
                  jaasLoginContextEntries.putReference(id, ref);
                  changedEntryContext = true;
              } else {
                  // make sure it was not previously registered, as it now has a missing module
                  changedEntryContext |= jaasLoginContextEntries.removeReference(id, ref);
                  synchronized (pendingContextEntryRefs) {
                      pendingContextEntryRefs.add(ref);
                  }
              }
          }
  
          if (changedEntryContext) {
              modified(properties);
          }
      }
docs: Look at the login module pids required by the context entry:
  <ul>
  <li>If there are no module pids, and the entry id is not one of the defaults, issue a warning.
  <li>If there are module pids, and some can't be found, add the entry to the pending list.
  <li>If all is well, add it to the map.
  </ul>
  
  @param ref JAASLoginContextEntry service reference