UPGRADING TO GRAILS 2
BRING THE PAIN
Grails 1.3.7 -> 2.0.4
WHOAMI
Ryan Applegate
@rappleg
https://github.com/rappleg
Work for ReachLocal
Grails Developer - 3+ years
Java Background - 7 years
Why Upgrade to 2.0.x?
Better Reloading - JVM Agent
Performance Improvements
New Unit Testing API
Interactive Console
etc...
Why Not?
Major Version Release - Regression?
Large App - grails stats ~ 123k LOC
2 Week Sprints
What could possibly go wrong?
-Scott Vlaminck
Upgrade Docs
http://grails.org/doc/2.0.4/guide/gettingStarted.html
#upgradingFromPreviousVersionsOfGrails
http://pledbrook.github.com/grails-howtos/en/upgradeToGrails2.html
http://naleid.com/blog/2012/05/01/upgrading-to-grails-2-unit-testing/
Let's do This
1 Week Jira Estimate
Download Grails 2.0.4
grails upgrade --force
grails run-app
*headdesk*
The Pain
App Won't Start
20+ Major Breaking Changes
2k+ Test Failures
run-app Gotchas
Unresolved Dependencies - Leaving forked plugins in both BuildConfig and application.properties
OutOfMemoryExceptions - Memory Hog
-XX:MaxPermSize=512m and Xmx=2G
Logging Convention Changes
service -> services
controller -> controllers
etc...
test-app Gotchas
No matter what you read on Grails blog posts or in the Grails docs JUnit style tests are not fully backwards compatible with Grails 2.
Ugly Truth
Some tests may need to be re-written to use new Mixins if test failures aren't obvious.
Mixins are your Friend
grails.test.mixin.*
TestFor
TestMixin
Mock
GrailsUnitTestMixin
DomainClassUnitTestMixin
ServiceUnitTestMixin
ControllerUnitTestMixin
...
Test Pollution
Unit Test in Integration Test folder
@TestFor in Integration Test
registerMetaClass NOT needed with TestMixins
http://naleid.com/blog/2012/05/22/fixing-grails-
tests-that-pass-in-isolation-but-fail-when-run-as-a-
suite
Final Thoughts
Juice worth the squeeze
Full Regression is a must
Be ready to potentially re-write unit tests
Grails 2 is a Memory Hog
Questions?
Slides Available
http://www.rvl.io/rappleg/upgrading-to-grails-2
upgrading to grails 2
By rappleg
upgrading to grails 2
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