code: protected String getPropStringValue(String aPropName, String aDefaultValue) {
          return dbPoolingProperties.getProperty(aPropName,
                  aDefaultValue);
      }
docs: get string value based on the property name from property file
  the property file is databasePooling.properties
  
  @param aPropName     a property name
  @param aDefaultValue a default value for that property, if the property is not there.
  @return string value of that property