code: @Override
      public String evaluateBatch(List<String> request) throws PEPException {
          if (request == null) {
              throw new NullPointerException("evaluateBatch(request=null)");
          }
          if (logger.isDebugEnabled()) {
              logger.debug("Resolving request batch ({} requests)", request.size());
          }
  
          String response = null;
          try {
              response = this.client.evaluateBatch(request.toArray(STRING_TYPE));
          } catch (Exception e) {
              logger.error("Error evaluating request.", e);
              throw new PEPException("Error evaluating request", e);
          }
  
          return response;
      }
docs: /*
  (non-Javadoc)
  @see org.fcrepo.server.security.xacml.pep.PEPClient#evaluateBatch(java.lang.String[])