Migration to Spring Boot 2.3

I’ve created spring-boot-2.3 branches on both generator-jhipster and jhipster project. I plan to create PR against these branches to handle the multiples changes required.

Overview of the impacts (identified so far)

• Elasticsearch (https://github.com/jhipster/generator-jhipster/pull/11683)

• upgrade to ES 7.6

• replace jest client by official RestHighLevelClient

• removal of the Jackson ObjectMapper

• embedded node is not started anymore

• MongoDB (https://github.com/jhipster/generator-jhipster/pull/11772)

• requires the MongoDB Java Driver 4.x

• move from mongobee (not maintained) to mongock (support for driver 4.x in progress: https://github.com/cloudyrock/mongock/issues/157)

• Couchbase (https://github.com/jhipster/generator-jhipster/pull/11845)

• now uses Couchbase SDK 3

• all changes: https://docs.spring.io/spring-data/couchbase/docs/4.0.0.RELEASE/reference/html/#couchbase.migrating

• requires support for SDK3 in Couchmove: https://github.com/differentway/couchmove/issues/10

• Cassandra (https://github.com/jhipster/generator-jhipster/pull/11753)

• upgrade to DataStax Driver version 4

• all changes: https://docs.spring.io/spring-data/cassandra/docs/3.0.0.RELEASE/reference/html/#cassandra.migration.2.x-to-3.x

• R2DBC (#11798)

• use new official starter, replacing experimental one

• use query derivation on server entities (User, AuditEvent, …)

[murdos]

@rodrigocprates : there will be a dedicated PR for mongodb, and when once Spring Boot 2.3 is released and most issues are solved, we’ll coordinate to merge the spring-boot-2.3 branch in master.

Regarding mongodb, I’ve done the migration to mongock in a branch, but it’s now waiting for mongock support of MongoDB Java Driver 4.

[jdubois]

Awesome work! Don’t forget the $500 bug bounty @murdos !