Making the long road short: How to migrate legacy enterprise Java apps to Spring Boot

Transcript

1. Making the long road short How to migrate legacy enterprise Java apps to Spring Boot Mark Heckler Principal Technologist/Spring Developer Advocate www.thehecklers.com mark@thehecklers.com mheckler@pivotal.io @mkheck
2. @mkheck @springframework @springboot Who am I? • Author • Speaker • Architect & Developer • Java Champion • Seeker of a better way
3. @mkheck @springframework @springboot Steps involved Review dependencies Review code & supporting scripts Create Spring Boot project w best approximation Convert database scripts (if applicable) Bring over static/public files (web UI/front end logic) Create Spring interfaces+classes that correspond to EE program structure (but not package structure) Copy/paste & get to work on the back end (bring coffee…a lot of coffee) Clean up the front end Test end to end
4. @mkheck @springframework @springboot Review dependencies pom.xml, build.gradle (hopefully) persistence.xml Documentation Draw upon existing knowledge to tie it all together
5. @mkheck @springframework @springboot Review code & supporting scripts Get the “lay of the land” Understand capabilities exposed/provided by the application Create your plan for conversion/re-creation
6. @mkheck @springframework @springboot Create Spring Boot project with best approximation We’ll start with Web (!), JPA, H2, & use Kotlin to really tighten things up
7. @mkheck @springframework @springboot Convert database scripts persistence(.xml) is key! javax.persistence.schema-generation.database.action javax.persistence.schema-generation.*-script-source (create, drop, sql-load) create & drop scripts -> schema(-*).sql (under /resources) sql-load scripts -> data(-*).sql (under /resources) (Note: visibility into DB essential in case of issues)
8. @mkheck @springframework @springboot –Calvin Coolidge, 30th US President (1923-1929) “Nothing in this world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent.”
9. @mkheck @springframework @springboot Convert database scripts <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/> <property name="javax.persistence.schema-generation.create-source" value="script"/> <property name="javax.persistence.schema-generation.drop-source" value="script"/> <property name="javax.persistence.schema-generation.create-script-source" value="sql/create.sql"/> <property name="javax.persistence.schema-generation.drop-script-source" value="sql/drop.sql"/> <property name="javax.persistence.sql-load-script-source" value="sql/load.sql"/>
10. @mkheck @springframework @springboot Bring over static/public files Copy into /static Basic functionality test (do the lights come on?)
11. @mkheck @springframework @springboot Create Spring interfaces+classes Correspond to EE program structure… but not necessarily package structure Domain classes, repositories, controllers, etc. “Scaffolding”
12. @mkheck @springframework @springboot Copy/paste & get to work Bring ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕ ☕
13. @mkheck @springframework @springboot Clean up the front end Make any adjustments necessary
14. @mkheck @springframework @springboot Test end to end Test Verify Adjust where necessary Repeat as necessary
15. @mkheck @springframework @springboot Let’s code!
16. @mkheck @springframework @springboot Helpful resources https://github.com/mkheck/javaee-to-spring https://www.twitter.com/mkheck (for updates)
17. @mkheck @springframework @springboot Thanks for coming, stay in touch! @mkheck mark@thehecklers.com mheckler@pivotal.io