Exercise: Deploying Java Spring application to SAP BTP

In this exercise, you will learn how to deploy the application to SAP BTP.

1. Checkout the branch javaspring_v5.0_deploytocf in SAP Business Application Studio

   1. Open SAP Business Application Studio.

   2. Run the following commands in the terminal. Make sure current working directory is /home/user/projects/cloud-sdk-learning-journey.

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      cd ~/projects/cloud-sdk-learning-journey
      git checkout javaspring_v5.0_deploytocf

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2. Build and push the project to SAP BTP

   1. Create a destination named mydestination in the SAP BTP subaccount with the following values

      

   2. Build and push the application to SAP BTP by running the following commands in the terminal (login using cf login in case of need):

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      cd bpstandardvdm 
      mvn clean install -Dmaven.test.skip=true 
      cf create-service destination lite mydestination 
      cf create-service xsuaa application myxsuaa 
      cf push 
      cf set-env bpstandardvdm API_KEY YOUR_APIKEY_GOES_HERE
      cf restage bpstandardvdm 

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      Note

      You will have to login to your SAP BTP Cloud Foundry account before running the cf commands. Since the application depends on xsuaa and destination service, we need to create an instance of these services before deploying the application

   3. Verify that the application is successfully deployed in SAP BTP and the myxsuaa and mydestination services are bound to the application

      

3. Query the Business Partner API of SAP S/4HANA Cloud

   1. Find out the URL of the application. After successful completion of the command cf push, the URL is displayed on the screen

      

   2. Open a new tab and browse to https://<application URL>/businessPartners - <application URL> is the URL you copied after executing the cf push command

   3. Verify that you are able to retrieve all the business partners

      

      Note

      The destination values can be modified to connect to an actual SAP S/4HANA Cloud system. Also, the SAP API Business Hub does not support CREATE, UPDATE operations

4. Optional: Review code in the following source files

   1. Code walk-through

      File name	Comments on code changes
      BusinessPartnerController.java	Code logic is as follows... Create a variable named destination of type HttpDestination using the getDestination static method of the DestinationAccessor class by passing the name of the destination
      GetBusinessPartnersCommand.java GetBusinessPartnerCommand.java CreateBusinessPartnerCommand.java UpdateBusinessPartnerCommand.java DeleteBusinessPartnerCommand.java	Read the APIKEY using an environment variable
      manifest.yml	Configuration values are as follows... Provide basic application information like name, memory, timeout, path etc. Specify that the application depends on myxsuaa and mydestination services
      requests.http	Provides various HTTP requests that can be submitted to query the Business Partner API
      commands.txt	Provides various commands that can be run on the terminal

5. Optional: Manually create the project

   1. Create or update the following files in the table below

      File name	Type	Contents
      BusinessPartnerController.java Path: ~/projects/bpstandardvdm/application/src/main/java/com/sap/cloud/sdk/tutorial/controllers	Modified	Copy contents from here...
      GetBusinessPartnersCommand.java Path: ~/projects/bpstandardvdm/application/src/main/java/com/sap/cloud/sdk/tutorial/utils	Modified	Copy contents from here...
      GetBusinessPartnerCommand.java Path: ~/projects/bpstandardvdm/application/src/main/java/com/sap/cloud/sdk/tutorial/utils	Modified	Copy contents from here...
      CreateBusinessPartnerCommand.java Path: ~/projects/bpstandardvdm/application/src/main/java/com/sap/cloud/sdk/tutorial/utils	Modified	Copy contents from here...
      UpdateBusinessPartnerCommand.java Path: ~/projects/bpstandardvdm/application/src/main/java/com/sap/cloud/sdk/tutorial/utils	Modified	Copy contents from here...
      DeleteBusinessPartnerCommand.java Path: ~/projects/bpstandardvdm/application/src/main/java/com/sap/cloud/sdk/tutorial/utils	Modified	Copy contents from here...
      manifest.yml Path: ~/projects/bpstandardvdm	Modified	Copy contents from here...