docs: public synchronized SSLConfig getDefaultSSLConfig() throws IllegalArgumentException {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              Tr.entry(tc, "getDefaultSSLConfig");
  
          SSLConfig defaultSSLConfig = null;
          String defaultAlias = getGlobalProperty(Constants.SSLPROP_DEFAULT_ALIAS);
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(tc, "defaultAlias: " + defaultAlias);
  
          if (defaultAlias != null) {
              defaultSSLConfig = sslConfigMap.get(defaultAlias);
  
              if (defaultSSLConfig != null) {
                  if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
                      Tr.exit(tc, "defaultAlias not null, getDefaultSSLConfig for: " + defaultAlias);
                  return defaultSSLConfig;
              }
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              Tr.exit(tc, "defaultAlias is null");
          return null;
      }