Grails 4 upgrade notes.md

Status

Ported non-trivial app - builds and runs on Grails 4 (master, no release yet) JDK 11.0.1. Startup is about 15 seconds. (2x faster than Grails 3.3.9)

IDE Support all works in Grails 4 (same as 3.3.9)

Updates

• Grails 4 - https://grails.github.io/grails-upgrade/latest/guide/index.html#upgradingTo4x
• Spring Boot 2.1 - https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.1-Release-Notes
• Spring 5.1 - https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x
• Groovy 2.5 - http://groovy-lang.org/releasenotes/groovy-2.5.html
• Hibernate 5.3/5.4 support - http://hibernate.org/orm/releases/5.4/
• JDK 11 - https://www.oracle.com/technetwork/java/javase/11all-relnotes-5013287.html

Plugins

Working

• Spring-Security-Core 4.0.0-BUILD_SNAPSHOT

  • New delegation password strategy:
    • https://www.baeldung.com/spring-security-5-password-storage
  • If you already used bcrypt can do it all at once too:
    • UPDATE my_users SET password = CONCAT('{bcrypt}', password);

• Spring-session-redis (boot starter)

  • Updated dependancies

compile "org.springframework.boot:spring-boot-starter-data-redis"
compile "org.springframework.session:spring-session-data-redis"

Mostly working

• Spring-Websocket
  • Seems to work, but cant import class into app
• Sentry
  • Seems loggers/reporters work

Not working

• Gson Views 2.0.0.BUILD-SNAPSHOT
  • Unable to render json with simple objects (just get null response)
  • Domain classes dont render:

  Model variable [someDomain] of with value [Description] type [com.x.SomeDomain] is not of the correct type [com.x.SomeDomain]. Stacktrace follows:
  

  • Opened Issue grails/grails-views#202
• Grails-Quartz
  • Seems boot is pulling in a much newer version of quartz
• External Config
  • Almost works - looks like an interface changed
    • sbglasius/external-config#35
• Grails Mail
  • Can't find/create bean
• Asset Pipeline Handlebars issue:
  • Needed to update to change //= require handlebars/handlebars.js to //= require handlebars-runtime

  2019-01-13 16:59:42.280  WARN --- [nio-8080-exec-1] asset.pipeline.DirectiveProcessor        : Unable to Locate Asset: /handlebars/handlebars.js
  Warning: Nashorn engine is planned to be removed from a future JDK release
  

Notes

• Build from source

  • No releaese yet, so clone grails-core and run:

    cd grails-core
    ./gradlew install -x groovydoc
    sdk install grails 4.0.0-SNAPSHOT `pwd`
    cd ..
    grails create-app four
    

• No more hot reload (spring-loaded)

  • Fast reload takes about 5-6 seconds (hopefully can improve)
  • GSP's currently trigger an app context reload - probably shouldn't?
  • Should ignore *.gson too?
    • grails/grails-core#11225
  • Running ./gradlew test caused a reload?
  • Side benefit - you can reload domain class changes

• Changed logback.groovy and now it thinks it's an Application class? (clean resolved)

  • Cant reproduce in a fresh app.

  Execution failed for task ':bootRun'.
  > Unable to find a single main class from the following candidates [logback, app.grails4.Application]
  

• Groovy 2.5.4

  • Doesn't include the Date Utils helpers by default - need to add them in.
    • compile 'org.codehaus.groovy:groovy-dateutil'
    • (Should just update to java.time.*)
  • JDK 11 Warnings (expected)
    • Disable by setting env var GROOVY_TURN_OFF_JAVA_WARNINGS=true

• Dependancies (Gradle 5.1)

  • Odd issue where dependancies like com.jameskleeh:excel-builder - dont pull in their dependancies (eg: Apache POI)

• Hibernate Depricated warnings (expected)

  • Hibernate's legacy org.hibernate.Criteria API is deprecated; use the JPA javax.persistence.criteria.CriteriaQuery instead
  • Hide em in logback.groovy - logger('org.hibernate.orm.deprecation', ERROR, ['STDOUT'], false)
  • HHH020100: The Ehcache second-level cache provider for Hibernate is deprecated. See https://hibernate.atlassian.net/browse/HHH-12441 for details.