APACHE GRAILS
Project Management Committee
Full-Stack Simplicity
Meets Agentic AI
An Introduction to Apache Grails 8
James Fredley
VP & Chair, Apache Grails PMC · 2025 Grails Rock Star
Gateway JUG · St. Louis · August 13, 2026
Agenda
01
What is Apache Grails?
Full-stack simplicity on Spring Boot + Groovy
02
The Apache Journey
From incubation to Top-Level Project
03
Grails 7 - The Largest Release Ever
6,456 commits, modern foundation
04
Grails 8 - Stack Modernization
Java 21 · Spring Boot 4 · Groovy 5 · Gradle 9
05
The Hibernate Criteria Story
Closing a 7+ year gap
06
Agentic Engineering with Grails
Why the framework multiplies AI agents
07
Practical Patterns & Takeaways
From vibe coding to durable velocity
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Speaker
James Fredley
Vice President & Chair, Apache Grails Project Management Committee
2025 Grails Rock Star
Serial technology entrepreneur, executive, and investor
28+ years in software engineering, digital marketing, and startup growth
Managed $1B+ cumulative revenue across 13 startups and ventures
Founder & CEO, Triumph Interactive
Member, UNCW Computer Science Department Executive Board
Based in Raleigh, North Carolina
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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What is Apache Grails?
A high-productivity, Groovy-based full-stack web framework built on Spring Boot.
Convention over Configuration
Sensible defaults that get out of your way
Expressive DSLs
GSP, URL mappings, constraints, builders
Powerful Grails Data
SQL + NoSQL data access with one API
Spring Boot Foundation
Full ecosystem, autoconfig, actuators
Rich Plugin Ecosystem
Security, async, views, integrations
Rapid Feedback Loops
Reload, scaffolding, CLI, Forge
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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The Apache Journey
From single-organization stewardship to community-governed Top-Level Project
Jul 2005
Project starts
(G2One)
2008–2015
SpringSource
stewardship
2015–2024
Object Computing
& Foundations
Jan 2025
Entered
Incubation
Sep 24 2025
ASF Board
TLP resolution
Oct 2025
Grails 7.0.0
GA + Graduation
13 PMC members · 17 committers · 22 source repos
Graduated from incubation after ~10 months under the Apache Way
Mono-repo consolidation, 109 Gradle subprojects, ~325 published JARs
Vendor-neutral, community-driven, sustainable governance
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Grails 7 - The Largest Release in Project History
6,456
commits (excl. merges)
v6.0.0 → v7.0.0
Previous major releases
Grails 3.0
5,353
runner-up
Grails 4.0
2,337
Grails 5.0
680
Grails 6.0
482
Grails 7.0 took 6,456 commits - the largest release in the project's history.
Margin over Grails 3.0 is 1.21×. The volume itself is the story.
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Release Velocity - The Strongest Signal
361
commits / month
Grails 8 cycle
(fastest ever)
241
commits / month
Grails 7 cycle
1 every
12 days
7.x GA releases
(25 total)
Grails 8 is shipping faster than any cycle in project history.
Rate (not total volume).
Earlier majors: 135 · 45 · 25 · 23 commits/month
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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7.x Release Cadence
25 GA releases across the 7.x line in 291 days (Oct 2025 – Aug 2026)
Line
GA Releases
Notes
7.0.x
16
Including 7.0.0 GA (2025-10-18)
7.1.x
6
7.2.x
3
7.2.2 released 2026-08-02
Total 7.x
25
~1 GA every 12 days
Aligned to Spring Boot release cycles. Six-month major cadence.
Grails 8.0.0-M5 also released 2026-08-02 - parallel tracks running.
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Grails 8 - Stack Modernization
Grails 6.2.3
Grails 7.x
Grails 8.0.0-M5
Java baseline
11
17
21
Spring Boot
2.7.18
3.5.x
4.1.0
Spring Framework
5.3.39
6.2.x
7.0.8
Groovy
3.0.23
4.0.x
5.0.8
Gradle
7.6.4
8.14.x
9.6.0
Micronaut
-
4.9.4
5.0.3
Servlet API
javax 4.0
jakarta 6.0
jakarta 6.1
Spock / JUnit
-
2.3-g4 / 5.12
2.4-g5 / 6.0
Hibernate (default)
5.6.15
5.6.15
5.6.15 (7.4 opt-in)
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Why These Upgrades Matter
Java 21 Baseline (21-26 supported)
Virtual threads, pattern matching, records, sequenced collections - modern language features become first-class.
Spring Boot 4 + Spring Framework 7
Modular autoconfigure, Jackson 3, Jakarta EE 11 alignment, improved observability and performance.
Groovy 5
Performance improvements, better static compilation, modern language parity with the rest of the JVM ecosystem.
Gradle 9
Faster builds, improved configuration cache, better toolchain support, future-proofed dependency management.
Hibernate 7 (opt-in)
Finally crossing the Criteria API chasm that the project founder once called “maybe impossible.”
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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The Hibernate Criteria Story
The most challenging update in the release
“The reason this represents a problem is there are functional gaps between what is possible with Hibernate Criteria API and what is possible with JPA criteria that we (the GORM team) don’t know how to solve… it represents a massive task that is maybe impossible to achieve without breaking user applications.”
- Graeme Rocher, HHH-13170, 20 Dec 2018
2017
Issue opened: move off deprecated Criteria
2018
HHH-13170 filed - “maybe impossible”
2022
Hibernate 6 removes legacy Criteria API
2025-26
Grails 8 ships Hibernate 7 support (218 commits, 1,102 files)
From the ticket: 7 years 8 months. We solved it for Grails 8. Thanks Walter!
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Agentic Engineering
Full-Stack Simplicity × AI Agents
Grails’ elegant simplicity and rapid feedback loops become a perfect multiplier for AI agents - enabling intelligent scaffolding, automated code generation and refactoring, smarter testing, documentation, and orchestrating complex feature implementation.
This is exactly how modern development happens now.
Why Grails is a Multiplier for AI Agents
Convention over Configuration
Agents can predict structure. Less guessing, fewer hallucinated paths.
Expressive, Concise Code
Groovy + DSLs mean less tokens for the same intent. Faster context windows.
Rapid Feedback Loops
CLI, reloading, scaffolding, Forge - agents get signal quickly and iterate.
GORM as a Stable Abstraction
One API across SQL/NoSQL. Agents generate consistent data access.
Spring Boot Foundation
Mature ecosystem, well-documented patterns that models already know.
Clear Boundaries
Controllers, services, domain, views - agents can own a layer cleanly.
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Practical Agentic Patterns with Grails
Explore & Plan
• Agent reads domain model + existing services
• Produces a feature plan with GORM impact analysis
• Maps to existing plugins before inventing new ones
Scaffold & Implement
• Generate domain + constraints + services
• Controllers with proper command objects
• GSP or JSON views that follow conventions
Verify & Refactor
• Spock unit + integration tests as first-class output
• Static analysis + type checking feedback
• Refactoring loops that stay within Grails idioms
Document & Release
• Auto-generated guides and changelogs
• Upgrade notes that mirror the official guide style
• PR descriptions that match project conventions
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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From Vibe Coding to Durable Engineering
The goal is not more code. The goal is higher-velocity, maintainable systems.
Vibe Coding Risks
• Inconsistent structure across features
• Tests that don’t match production paths
• Plugins reinvented instead of reused
• Upgrade debt accumulated silently
• Documentation that drifts from reality
Grails + Agents Advantage
• Conventions constrain the agent productively
• Spock + Geb give clear verification signals
• Existing plugin surface is discoverable
• Upgrade guides become agent context
• GSP / views stay consistent by design
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Key Takeaways
1
Grails is alive and accelerating
Fastest release velocity in project history under Apache governance.
2
Grails 8 is a platform upgrade
Java 21, Spring Boot 4, Groovy 5, Gradle 9 - modern JVM baseline.
3
Hard problems are being closed
Hibernate 7 support closes a multi-year Criteria API gap which trapped Grails on Hibernate 5.
4
Simplicity multiplies agents
Convention, DSLs, and fast feedback make Grails an ideal agent substrate.
5
Quality still wins
Use agents to raise the floor, not to lower the ceiling of craftsmanship.
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Resources & Get Involved
Website & Docs
https://grails.apache.org
Grails 8 Upgrade Guide
https://grails.apache.org/docs/8.0.0-M5/guide/upgrading.html
Source (mono-repo)
https://github.com/apache/grails-core
Graduation Announcement
https://grails.apache.org/blog/2025-10-07-apache-grails-graduation-top-level-project.html
Dev Mailing List
https://lists.apache.org/list.html?dev@grails.apache.org
Slack / Community
https://grails.apache.org/community.html
Contributions welcome - issues, PRs, docs, plugins, mentoring.
Apache Grails 8 · Gateway JUG · Aug 13, 2026
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Thank You
Questions & Discussion
James Fredley
VP & Chair, Apache Grails PMC
grails.apache.org · @JamesFredley