code: @Override
      public Builder claimFrom(JwtToken jwt) throws InvalidTokenException {
          if (jwt != null && !jwt.getClaims().isEmpty()) {
              claims.putAll(jwt.getClaims());
              // copyClaimsMap(jwt.getClaims());
          } else {
              String err = Tr.formatMessage(tc, "JWT_INVALID_TOKEN_ERR");// "JWT_INVALID_TOKEN_ERR";
              throw new InvalidTokenException(err);
          }
          return this;
      }
docs: /*
  (non-Javadoc)
  
  @see com.ibm.ws.security.jwt.internal.Builder#claimFrom(com.ibm.websphere.security.jwt.JwtToken)