NCUG 2019: Spring forward: an introduction to Spring boot and Thymeleaf for (XPages) developers
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The world of (XPages) developer is moving fast. Customers rethinking platforms and solutions. Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can "just run". In combination with Thymeleaf can it be good alternative for your XPages applications. In this session I give an introduction of Spring Boot and Thymeleaf and how to get started. I will show the differences and similarities between Spring Boot in combination with Thymeleaf and XPages. I will explain the challenges I faced when moving an application.
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NCUG 2019: Spring forward: an introduction to Spring boot and Thymeleaf for (XPages) developers
- 1. Spring forward: an introduction to Spring boot and Thymeleaf for (XPages) developers Frank van der Linden Full stack Developer elstar IT
- 2. About me • Freelance Full stack developer • Owner of elstar IT • Curious of new technology • IBM Champion 2013, 2014, 2017, 2018 and 2019
- 3. Disclaimer Session is NOT about #dominoforever
- 4. How to proceed • What is Spring boot and Thymeleaf • Similarities and differences • Runs everywhere • How to start • Syntax • Security • New possibilities
- 5. What is Spring boot and Thymeleaf
- 7. Spring boot • Open source, Pivotal is coordinating. • Spring boot creates Spring (Java) based applications • Embedded Tomcat makes it ‘just’ run everywhere • Auto configure as much as possible • Built in metrics and health checks • Easy to configure with YAML or property file • Very good documentation and code examples • Fast creation of REST api’s
- 8. Thymeleaf • Is a template engine • Based on Java and HTML5 • Very strict, or template will break • Full Spring framework support • Extensible with dialects • Full (and extensible) internationalisation support. • Reusable fragments, like Custom Controls • Extensive documentation
- 10. XPages Spring Boot/Thymeleaf Configure Faces-config @Autowired Endpoints Need work or SmartNSF very strong support Security Built-in Need Spring Security Add-ons Lots of 3rd party add-on Thanks to OpenNTF Lots of 3rd party add-on Deployment Runs on Domino Runs everwhere Build Pain of the Domino Designer Maven/Gradle build out-of-the box IDE DDE (Windows) for OSGi plugins almost every IDE Almost every IDE, like Netbeans, Eclipse, IntelliJ and more (Windows, Linux, MacOS)
- 11. Runs everywhere
- 12. Runs everywhere • With Embedded Tomcat as default the jar ‘just run’ • More choices of embedded web server, in the future also OpenLiberty • Will run on Docker • Will run on Cloud Foundry, like IBM Cloud or Pivotal on Azure • Tomcat can by excluding to run it on Websphere Application Server, Tomcat or WildFly (a.k.a JBoss) • Even on Domino as OSGi plugin, http://hasselba.ch/blog/?p=2589
- 13. How to start
- 14. How to start • Install Gradle or Maven • Move over to start.spring.io • Or use the Starter in IntelliJ • Fill all the fields and select the required projects (full version) • Generate project • Download zip, unzip and add to Git repository. • Open project in favourite IDE, run ‘mvn clean install’ • Start coding
- 16. Spring boot setup minimal YAML file
- 17. Thymeleaf setup add to pom.xml
- 18. How it works together
- 19. Syntax
- 20. Spring boot syntax endpoint to return an object as JSON endpoint to return a thymeleaf template
- 21. Component scan • Component scan will scan all the packages for @Service, @Controller, @Repository and more @Component(s) • @Autowired will glue everything together
- 22. Thymeleaf syntax • Include the th namespace to the page • Every html element attribute has a th:…. Equivalent. • Variable Expressions: ${...} • Selection Variable Expressions: *{...} • Message Expressions: #{...} • Link URL Expressions: @{...}
- 28. Link URL Expressions resource links links in on a page
- 29. Global objects
- 30. Fragments (1)
- 31. Fragments (2)fragment code use it multiple times
- 32. Attachments • Forget the UploadedFile provided by IBM, learn MultipartFile • MultipartFile has lots of similarities with UploadedFile, but easier to use. Less code to achieve the same
- 33. Security
- 34. Spring Security • Framework for Authentication and Authorisation • Prevention of clickjacking, CORS, cross site request forgery • Integrates with Spring Boot and Thymeleaf • Customisable to the bone • Support for Basic Authentication, SAML2, oAuth and more.
- 35. Configuration CORS prevention add to pom.xml
- 36. Spring security in Thymeleaf add to pom.xml add namespace
- 38. Lombok • Forget Getters and Setters • Forget toString, hashCode and equals • One @Annotations rules the all (@Data or @Getter and @Setter) • Add logging by @annotations (@Log4j2 or @Slf4j)
- 39. Lombok add to pom.xml add @Data using the build in logging
- 40. Swagger • Part of Open API Specification, since v3 • Documentation of API’s • Playground for testing • Add annotation to generate the documentation dynamically
- 41. Swagger add to pom.xml add a configuration add annotation to endpoint
- 42. Jenkins • With Jenkins you can build automatically the application • …But also do quality control, do load tests and even deploy. • JenkinsFile should be in the root of the GIT Repository • Groovy is the language for JenkinsFile
- 43. Jenkins file
- 44. Questions
- 46. Reach out to me @flinden68 https://www.elstarit.nl flinden68@elstarit.nl https://nl.linkedin.com/in/flinden68 https://github.com/flinden68
- 47. Resources • Spring Initializr • http://start.spring.io/ • Thymeleaf documentation • http://www.thymeleaf.org/ • Spring Boot • https://projects.spring.io/spring-boot/ • Lombok • https://projectlombok.org/ • Jenkins • https://jenkins.io/
- 48. Resources • Swagger • http://swagger.io • Thymeleaf documentation • http://www.thymeleaf.org/ • Maven • https://maven.apache.org/ • Gradle • https://gradle.org/ • Spring Forward Starter • https://bitbucket.org/flinden68/spring-forward-starter