Spring Boot web app (Thymeleaf + htmx)

A server-rendered Java web app on Spring Boot with Thymeleaf templates and htmx for partial page updates, built with Maven and make, with no JavaScript build. Forms validate on the server and work without JavaScript, Spring Security checks CSRF tokens, error pages come from one table, and tests read the rendered HTML through MockMvc and a browser without JavaScript.

What done means

Your agent follows the brief, then runs stacks verify without weakening or skipping checks. What happens next

Declared steps: install, fmt-check, lint, compile, test, test-integration, build, web, readme-filled. View commands

Use this stack

Paste the prompt into the coding agent working on your project.

Full projectQuick local experiment

Uses the stack’s default fragments. Review the brief with your agent.Uses stated defaults and omits deploy, release, and app fragments unless explicitly requested.

View prompt

Use the spring-boot-web stack for this project. 1. Run npx @steamfield/stacks show spring-boot-web --json and check that it fits the project. If it does not, explain why before changing files. 2. Run npx @steamfield/stacks new spring-boot-web and follow the brief it prints. 3. From the generated project directory, run npx @steamfield/stacks verify. Fix failures without weakening or skipping verification steps. 4. Summarize what changed and the verification result. Quote published stats only when they are available, including their interval and sample size. The stacks docs, written for agents, are at https://stacks.steamfield.io/llms.txt.

Use the spring-boot-web stack for a quick local experiment. 1. Run npx @steamfield/stacks show spring-boot-web --json and check that it fits the project. If it does not, explain why before changing files. 2. Run npx @steamfield/stacks new spring-boot-web --sandbox and follow the brief it prints. 3. From the generated project directory, run npx @steamfield/stacks verify. Fix failures without weakening or skipping verification steps. 4. Summarize what changed and the verification result. Quote published stats only when they are available, including their interval and sample size. The stacks docs, written for agents, are at https://stacks.steamfield.io/llms.txt.

Or use the terminal

npx @steamfield/stacks new spring-boot-web

npx @steamfield/stacks new spring-boot-web --sandbox

Verify steps
Step	Phase	Layer	Command
install	setup	install	`make install`
fmt-check	check	lint	`make fmt-check`
lint	check	lint	`make lint`
compile	check	typecheck	`make compile`
test	check	test	`make coverage`
test-integration	check	test	`make test-integration`
build	check	build	`make build`
web	serve	serve	`make serve`
readme-filled	check	check	`test -s README.md && ! grep -n 'stacks:fill' README.md`

Usage and outcomes

Usage over time

Showing 180 days of history.

History

The 28-day green rate at each weekly observation. Gaps mean the sample was too small to publish.

Shaded band: 95% Wilson interval. Dashed rules: content changes. Missing observations remain gaps.

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table

Through	Green rate	Projects	Content change
5 Jul 2026	hidden: too few projects	–	–
12 Jul 2026	72% (67–76%, n=340)	480	–
19 Jul 2026	70% (66–73%, n=715)	1,025	–
26 Jul 2026	70% (67–72%, n=1,290)	1,850	–
2 Aug 2026	69% (67–71%, n=1,880)	2,770	–
9 Aug 2026	69% (67–71%, n=2,215)	3,295	–
16 Aug 2026	69% (67–71%, n=2,540)	3,755	–
23 Aug 2026	68% (67–70%, n=2,735)	4,030	–
30 Aug 2026	68% (66–70%, n=2,990)	4,320	–
6 Sept 2026	66% (65–68%, n=3,170)	4,565	–
13 Sept 2026	66% (64–68%, n=3,415)	4,940	–
20 Sept 2026	66% (64–68%, n=3,545)	5,175	–
27 Sept 2026	66% (65–68%, n=3,795)	5,545	–
4 Oct 2026	66% (65–68%, n=4,025)	5,885	–
11 Oct 2026	66% (64–67%, n=4,195)	6,160	–
18 Oct 2026	65% (64–67%, n=4,440)	6,460	–
25 Oct 2026	66% (64–67%, n=4,495)	6,560	–
1 Nov 2026	66% (64–67%, n=4,680)	6,815	–

Weekly projects by preset

Non-overlapping seven-day project counts, grouped by the preset used to start the project.

default
sandbox

Stacks projects per UTC week through 4 Nov 2026. Published preset counts only; hidden cells are not zero.

Data table

Week ending	Preset	Projects
5 Jul 2026	default	–
12 Jul 2026	default	315
19 Jul 2026	default	365
26 Jul 2026	default	535
2 Aug 2026	default	585
9 Aug 2026	default	640
16 Aug 2026	default	640
23 Aug 2026	default	725
30 Aug 2026	default	790
6 Sept 2026	default	825
13 Sept 2026	default	870
20 Sept 2026	default	825
27 Sept 2026	default	1,040
4 Oct 2026	default	1,030
11 Oct 2026	default	1,080
18 Oct 2026	default	1,075
25 Oct 2026	default	1,090
1 Nov 2026	default	1,180
5 Jul 2026	sandbox	–
12 Jul 2026	sandbox	165
19 Jul 2026	sandbox	180
26 Jul 2026	sandbox	290
2 Aug 2026	sandbox	335
9 Aug 2026	sandbox	365
16 Aug 2026	sandbox	365
23 Aug 2026	sandbox	375
30 Aug 2026	sandbox	425
6 Sept 2026	sandbox	425
13 Sept 2026	sandbox	510
20 Sept 2026	sandbox	505
27 Sept 2026	sandbox	540
4 Oct 2026	sandbox	560
11 Oct 2026	sandbox	575
18 Oct 2026	sandbox	555
25 Oct 2026	sandbox	590
1 Nov 2026	sandbox	665

By preset

Green verify outcomes by the preset chosen at scaffold time.

default

64%62–66%, n=2,825

sandbox

69%67–71%, n=1,510

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table

Name	Green rate	Projects
default	64% (62–66%, n=2,825)	4,110
sandbox	69% (67–71%, n=1,510)	2,225

By agent

Within this stack, listed alphabetically. These are project outcomes, not an agent ranking.

claude

66%64–68%, n=2,395

codex

67%64–69%, n=1,060

cursor

65%61–70%, n=415

none

62%53–70%, n=125

opencode

61%54–67%, n=245

other

67%57–75%, n=100

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table

Name	Green rate	Projects
claude	66% (64–68%, n=2,395)	3,495
codex	67% (64–69%, n=1,060)	1,585
cursor	65% (61–70%, n=415)	605
none	62% (53–70%, n=125)	190
opencode	61% (54–67%, n=245)	320
other	67% (57–75%, n=100)	135

Time to green

Published time summaries on a shared minutes scale. First passing test is a median; 75% reached green by the 75th percentile.

Verify runs to green: 1

Stacks projects · 28 days through 4 Nov 2026. Counts rounded to 5.

Data table

Measure	Time / runs
Median to green	24 minutes
75th percentile	32 minutes
First passing test	14 minutes
Verify runs to green	1

Where it breaks

A run can fail more than one step. Environment failures are shown separately.

test-integration26%

test22%

build13%

lint11%

install6%

fmt-check6%

compile6%

readme-filled5%

web5%

Environment blocked0%

Share of failed runs before first green. Environment blocked describes the machine, not the stack.

Data table

Step	Share
build	13%
test-integration	26%
test	22%
lint	11%
install	6%
fmt-check	6%
readme-filled	5%
web	5%
compile	6%
Environment blocked	0%

What people change

Defaults people keep, and optional fragments they choose to attach.

Default, kept rate

agent-ops92%

git-hooks92%

ci-github92%

Optional, attach rate

rr17%

ce-plugin17%

Share of the window's 6,335 projects. Kept rate is 1 minus the without rate.

Data table

Fragment	Measure	Share
agent-ops	Kept	92%
git-hooks	Kept	92%
ci-github	Kept	92%
rr	Attached	17%
ce-plugin	Attached	17%

By composition 29 fingerprints

Each row is a distinct fragment composition, with its own sample and content history.

Composition	Green rate	Seen	Change in life
defaults + ce-plugin − agent-ops · 07438ead	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults − git-hooks · 09022297	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + rr − ci-github · 2e3f696a	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + rr − ci-github − git-hooks · 3f5d28b6	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin + rr − ci-github · 3fe6a454	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults − agent-ops − ci-github − git-hooks · 417a2b73	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults − ci-github · 4b6cc45e	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin − git-hooks · 50f0d637	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults · 5b7844fa	65% (64–67%, n=3,005)	12 Jul 2026 – 1 Nov 2026	None
defaults − agent-ops − git-hooks · 60b338d6	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + rr − agent-ops − git-hooks · 66d7f773	hidden: too few projects	2 Aug 2026 – 1 Nov 2026	None
defaults + rr − agent-ops · 7c0a1bb7	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults − agent-ops − ci-github · 7df0afa4	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + rr · 8cf5b8e9	69% (65–72%, n=620)	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin − agent-ops − ci-github − git-hooks · 9e70bf2b	hidden: too few projects	19 Jul 2026 – 1 Nov 2026	None
defaults − agent-ops · a1c8a07a	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults − ci-github − git-hooks · a1f9832b	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin − ci-github − git-hooks · a8d19347	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin + rr − ci-github − git-hooks · b3d5f530	hidden: too few projects	27 Sept 2026 – 1 Nov 2026	None
defaults + ce-plugin · b61b447d	64% (61–68%, n=600)	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin + rr · c175de52	65% (56–73%, n=110)	12 Jul 2026 – 1 Nov 2026	None
defaults + rr − git-hooks · c2530bb2	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin + rr − agent-ops · c39f8efb	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin − ci-github · c7915885	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin + rr − agent-ops − ci-github · d19126bd	hidden: too few projects	9 Aug 2026 – 1 Nov 2026	None
defaults + ce-plugin − agent-ops − ci-github · f4d23a06	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + rr − agent-ops − ci-github · f784ede8	hidden: too few projects	2 Aug 2026 – 1 Nov 2026	None
defaults + ce-plugin − agent-ops − git-hooks · fdb6c79c	hidden: too few projects	12 Jul 2026 – 1 Nov 2026	None
defaults + ce-plugin + rr − git-hooks · fe1ccea1	hidden: too few projects	19 Jul 2026 – 1 Nov 2026	None

Computed 5 Nov 2026, through 4 Nov 2026. Numbers describe stacks projects, not the ecosystem.