code: public void setSystemProperties() {
          // copy all other initial properties to system properties
  
          for (Map.Entry<String, String> entry : initProps.entrySet()) {
              if (!entry.getKey().equals("websphere.java.security")) {
                  final String key = entry.getKey();
                  final String value = entry.getValue();
                  try {
                      AccessController.doPrivileged(new java.security.PrivilegedExceptionAction<Void>() {
                          @Override
                          public Void run() throws Exception {
                              System.setProperty(key, value);
                              return null;
                          }
                      });
                  } catch (Exception ex) {
                  }
              }
          }
      }
docs: Set configured attributes from bootstrap.properties as system properties.
  <p>
  This is a separate step from config to ensure it is called once (by the launcher),
  rather than every/any time configure is called (could be more than once, some future
  nested environment.. who knows?).