Spring forward: an introduction to Spring boot and Thymeleaf for ICS developers

The world of a ICS 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 Domino 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.

Transcript

1. Spring forward an introduction to Spring boot and Thymeleaf for developers Frank van der Linden Full stack Developer
2. Social Connections 15 Munich, September 16-18 2019
3. Social Connections 15 Munich, September 16-18 2019 About me • Freelance Full stack developer • Owner of elstar IT • Curious of new technology • IBM Champion 2013, 2014, 2017, 2018 and 2019 • HCL Master 2019
4. Social Connections 15 Munich, September 16-18 2019 How to proceed • What is Spring boot and Thymeleaf • How to start • Syntax • Security • Bonus - new possibilities
5. Social Connections 15 Munich, September 16-18 2019 Spring Forward Starter - demo project https://github.com/flinden68/spring-forward-starter
6. Social Connections 15 Munich, September 16-18 2019 What is Spring boot and Thymeleaf
7. Social Connections 15 Munich, September 16-18 2019
8. Social Connections 15 Munich, September 16-18 2019 Spring boot • Open source, Pivotal is coordinating the releases • 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
9. Social Connections 15 Munich, September 16-18 2019 Runs everywhere • With Embedded Tomcat as default the jar ‘just run’ • More choices of embedded web server, like Netty • 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
10. Social Connections 15 Munich, September 16-18 2019 Thymeleaf • Is a template engine, like XPages or Freemarker • 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
11. Social Connections 15 Munich, September 16-18 2019 How to start
12. Social Connections 15 Munich, September 16-18 2019 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
13. Social Connections 15 Munich, September 16-18 2019 Wizard in IntelliJ
14. Social Connections 15 Munich, September 16-18 2019 Spring boot setup minimal YAML property file
15. Social Connections 15 Munich, September 16-18 2019 Thymeleaf setup add to pom.xml
16. Social Connections 15 Munich, September 16-18 2019 How it works together
17. Social Connections 15 Munich, September 16-18 2019 Syntax
18. Social Connections 15 Munich, September 16-18 2019 Spring boot syntax endpoint to return an object as JSON endpoint to return a thymeleaf template
19. Social Connections 15 Munich, September 16-18 2019 Component scan • Component scan will scan all the packages for @Service, @Controller, @Repository and more @Component(s) • @Autowired will glue everything together
20. Social Connections 15 Munich, September 16-18 2019 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: @{...}
21. Social Connections 15 Munich, September 16-18 2019 Namespace <html lang="en" xmlns:th="http://www.thymeleaf.org">
22. Social Connections 15 Munich, September 16-18 2019 Thymeleaf attributes
23. Social Connections 15 Munich, September 16-18 2019 Variable Expressions
24. Social Connections 15 Munich, September 16-18 2019 Selection Variable Expressions
25. Social Connections 15 Munich, September 16-18 2019 Message Expressions
26. Social Connections 15 Munich, September 16-18 2019 Link URL Expressions resource links links in on a page
27. Social Connections 15 Munich, September 16-18 2019 Global objects
28. Social Connections 15 Munich, September 16-18 2019 Fragments (1)
29. Social Connections 15 Munich, September 16-18 2019 Fragments (2) fragment code use it multiple times
30. Social Connections 15 Munich, September 16-18 2019 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
31. Social Connections 15 Munich, September 16-18 2019 Security
32. Social Connections 15 Munich, September 16-18 2019 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.
33. Social Connections 15 Munich, September 16-18 2019 Configuration CORS prevention add to pom.xml
34. Social Connections 15 Munich, September 16-18 2019 Spring security in Thymeleaf add to pom.xml add namespace
35. Social Connections 15 Munich, September 16-18 2019 Bonus - new possibilities
36. Social Connections 15 Munich, September 16-18 2019 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)
37. Social Connections 15 Munich, September 16-18 2019 Lombok add to pom.xml add @Data using the build in logging
38. Social Connections 15 Munich, September 16-18 2019 Swagger • Part of Open API Specification, since v3 • Documentation of API’s • Playground for testing • Add annotation to generate the documentation dynamically
39. Social Connections 15 Munich, September 16-18 2019 Swagger add to pom.xml add a configuration add annotation to endpoint
40. Social Connections 15 Munich, September 16-18 2019 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
41. Social Connections 15 Munich, September 16-18 2019 Jenkins file
42. Social Connections 15 Munich, September 16-18 2019 Questions
43. Social Connections 15 Munich, September 16-18 2019 Reach out to me @flinden68 https://www.elstarit.nl flinden68@elstarit.nl https://nl.linkedin.com/in/flinden68 https://github.com/flinden68
44. Social Connections 15 Munich, September 16-18 2019 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/
45. Social Connections 15 Munich, September 16-18 2019 Resources •Swagger •http://swagger.io •Thymeleaf documentation •http://www.thymeleaf.org/ •Maven • https://maven.apache.org/ •Gradle • https://gradle.org/ •Spring Forward Starter • https://github.com/flinden68/spring-forward-starter
46. Social Connections 15 Munich, September 16-18 2019