public void updateBidForKeyword(Long adGroupId, Long keywordId, Long bidAmount) {

      

               AdWordsSession adwordSession = null;

   

               // initialize AdWords session



                try {

            // Generate a refreshable OAuth2 credential

            Credential oAuth2Credential = new OfflineCredentials.Builder().forApi(Api.ADWORDS)

                  .fromFile().build()

                  .generateCredential();



            // Construct an AdWordsSession.

            adwordSession = new AdWordsSession.Builder().fromFile().withOAuth2Credential(oAuth2Credential).build();



         } catch (Exception ex) {

                               

         }

              

                // Get CampaignCriterionService using AdWordsSession



                AdWordsServices adWordsServices = new AdWordsServices();



      CampaignCriterionServiceInterface campaignCriterionService = adWordsServices.get(adwordSession, CampaignCriterionServiceInterface.class);

               

      AdGroupCriterionServiceInterface adGroupCriterionService = GoogleAuthenticationService

            .getAdGroupCriterionService();



      Keyword keyword = new Keyword();

      keyword.setId(keywordId);



      BiddableAdGroupCriterion keywordBiddableAdGroupCriterion = new BiddableAdGroupCriterion();

      keywordBiddableAdGroupCriterion.setAdGroupId(adGroupId);

      keywordBiddableAdGroupCriterion.setCriterion(keyword);



      BiddingStrategyConfiguration biddingStrategyConfiguration = new BiddingStrategyConfiguration();

      CpcBid bid = new CpcBid();

      bid.setBid(new Money(null, bidAmount));

      biddingStrategyConfiguration.setBids(new Bids[] { bid });

      keywordBiddableAdGroupCriterion.setBiddingStrategyConfiguration(biddingStrategyConfiguration);



      AdGroupCriterionOperation keywordAdGroupCriterionOperation = new AdGroupCriterionOperation();

      keywordAdGroupCriterionOperation.setOperand(keywordBiddableAdGroupCriterion);

      keywordAdGroupCriterionOperation.setOperator(Operator.SET);



      AdGroupCriterionOperation[] operations = new AdGroupCriterionOperation[] { keywordAdGroupCriterionOperation };



      AdGroupCriterionReturnValue result = null;



      try {

         result = adGroupCriterionService.mutate(operations);

      } catch (Exception e) {

         e.printStackTrace();

      }

      

      // Display campaigns.

      for (AdGroupCriterion campaignCriterion : result.getValue()) {

         System.out.printf("Campaign criterion with criterion ID %d, " + "and type '%s' was added.%n",

               campaignCriterion.getCriterion().getId(), campaignCriterion.getCriterion().getCriterionType());

      }



   }

// Create selector

Selector selector = new Selector();

selector.getFields().addAll(Arrays.asList("Id","Criteria","Conversions"));

      

Predicate predicate = new Predicate();

predicate.setField("CampaignId");

PredicateOperator predicateOperator = PredicateOperator.EQUALS;

predicate.setOperator(predicateOperator);

predicate.getValues().add(campaignId);

      

selector.getPredicates().add(predicate);