Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-21 11:55 UTC

undertow-io / undertow

High performance non-blocking webserver

JavaApache-2.0★ 3,758 stars⑂ 1,054 forkssince Jul 2012View on GitHub ↗

undertow-io/undertow holds a health index of 89 out of 100, placing it in the Excellent band. It scores highest on Community & Adoption (91/100) and lowest on AI Readiness (58/100). It was last updated 6 days ago. A single contributor accounts for most of its recent work.

89
overall / 100
Excellent

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

89
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 75 is calibrated to 89 on the published index scale (record calibration 2026-08-02).

Ownership

undertow-ioOrganization
36 followers11 public repossince Jul 2012

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
Mavenio.undertow:undertow-core2.4.2.Final-34942 days ago
Mavenio.undertow:undertow-servlet2.3.26.Final-33942 days ago
Mavenio.undertow:undertow-websockets-jsr2.3.26.Final-33942 days ago

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

89Excellent · 21% of overall
How it's scored
36/36Push recencylast push 6 days ago
29.8/36Commit cadence43/52 weeks with commits
18/18Commit volume272 commits in the last year
10/10OpenSSF Scorecard: Maintained13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year272
human_commit_share1
days_since_last_push6
active_weeks_last_year43
How it's scored
27/27Ships releases20 releases published
27/36Release recencylatest release 92 days ago
27/27Release cadencea release every ~24.7 days
0/10OpenSSF Scorecard: Signed-ReleasesProject has not signed or included provenance with any releases.
Inputs used
releases_count20
latest_release_tag2.4.1.Final
releases_from_tagsno
days_since_latest_release92
mean_days_between_releases24.7

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

91Excellent · 17% of overall
How it's scored
58/60Stars3,758 stars
25/25Forks1,054 forks
12.6/15Watchers187 watchers
Inputs used
forks1,054
stars3,758
watchers187
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

85Excellent
How it's scored
22.5/22.5README
22.5/22.5Licenserecognized license (Apache-2.0)
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges0
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_services
has_pull_request_templateno

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

69Good · 23% of overall
How it's scored
9/54Bus factor1 contributor(s) cover half of all commits
8.7/22.5Commit distributiontop contributor authored 62% of commits
13.5/13.5Contributor breadth100 contributors
10/10OpenSSF Scorecard: Contributorsproject has 69 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled100
top_contributor_share0.615
How it's scored
0/42Issue resolutionno issues or no data
22.1/30PR acceptance1,425/1,938 decided PRs merged
0/13Newcomer PR acceptanceno first-time contributor's PR decided in 30d
10.5/15OpenSSF Scorecard: Code-ReviewFound 10/14 approved changesets -- score normalized to 7
Inputs used
merged_prs1,425
open_issues0
closed_issues0
prs_merged_7d1
prs_decided_7d2
prs_merged_30d2
prs_decided_30d3
issue_closed_ratio
closed_unmerged_prs513
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Issue resolution, Newcomer PR acceptance. Remaining weights renormalized.
How it's scored
30/30Ownership backingorganization-owned
0/20Verified domainverified-domain status not read for this organization
11.3/25Owner reach36 followers of undertow-io
19.9/25Track record11 public repos, account ~14 yr old
Inputs used
followers36
owner_typeOrganization
is_verified
owner_loginundertow-io
public_repos11
account_age_days5,146
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable3 package(s) on maven
35/35Publish recencylatest publish 42 days ago
20/20Version history349 published versions
20/20Not deprecatedactive, not deprecated or yanked
Inputs used
packagesio.undertow:undertow-core, io.undertow:undertow-servlet, io.undertow:undertow-websockets-jsr
ecosystemsmaven
any_deprecatedno
min_days_since_publish42

Engineering Quality

Are baseline engineering and documentation practices in place?

63Moderate · 19% of overall
How it's scored
24/24CI workflows1 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
0/6.4.editorconfig
14/20OpenSSF Scorecard: CI-Tests11 out of 14 merged PRs checked by a CI test -- score normalized to 7
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configno
has_precommit_configno
How it's scored
30/30README
0/25Documentation directory
15/15Documentation / homepage sitehttps://undertow.io
10/10Repository description
10/10Topics13 topics
0/10Wiki
Inputs used
topicshacktoberfest, ajp, http, http-server, jakartaee, jakartaee10, java, java-nio, jboss, servlet, web, websocket, wildfly
has_wikino
homepagehttps://undertow.io
docs_sitehttps://undertow.io
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

66Good · 16% of overall
How it's scored
7.5/7.5Binary-Artifactsno binaries found in the repo
0/7.5Branch-Protectionno data
1.8/2.5CI-Tests11 out of 14 merged PRs checked by a CI test -- score normalized to 7
0/2.5CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
5.2/7.5Code-ReviewFound 10/14 approved changesets -- score normalized to 7
2.5/2.5Contributorsproject has 69 contributing companies or organizations
10/10Dangerous-Workflowno dangerous workflow patterns detected
0/7.5Dependency-Update-Toolno update tool detected
5/5Fuzzingproject is fuzzed
2.5/2.5Licenselicense file detected
7.5/7.5Maintained13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
0/5Packagingno data
0/5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
0/5SASTSAST tool is not run on all commits -- score normalized to 0
5/5Security-Policysecurity policy file detected
0/7.5Signed-ReleasesProject has not signed or included provenance with any releases.
0/7.5Token-Permissionsdetected GitHub workflow tokens with excessive permissions
6.8/7.5Vulnerabilities1 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated16
scorecard_versionv5.5.0
checks_inconclusive2
scorecard_aggregate5.8
Excluded from scoring (no data or not applicable): Branch-Protection, Packaging. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisoriesno direct dependency carries a known advisory
25/25Indirect dependencies free of known advisoriesno indirect dependency carries a known advisory
0/40No advisories left outstandingno advisory carries a publication date
Inputs used
sourceosv
advisories0
affected_packages0
assessed_packages17
unassessed_packages0
affected_by_severitynone
direct_affected_packages0
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the maven:io.undertow:undertow-core@2.4.2.Final runtime dependency closure — what installing the published package pulls in — 17 packages. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

58Moderate · 4% of overall
How it's scored
0/45Agent instructionsno CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
29.3/40Legible commit history55 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url
legible_history_share0.55
agent_instruction_files
agent_instruction_max_bytes
How it's scored
12.6/18One-command bootstrapbenchmarks/pom.xml, core/pom.xml, coverage-report/pom.xml (toolchain convention, no task runner)
22/22Automated tests
0/11Lint / format config
11/11Static type checkingJava (statically typed)
0/10Reproducible environment
2/10Demonstrated agent practice1 of the last 100 commits agent-authored or agent-credited
0/8Automated maintenanceno automated dependency updates observed
0/10OpenSSF Scorecard: Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfiles
has_dockerfileno
typed_languageyes
bootstrap_files
has_devcontainerno
has_linter_configno
typecheck_configs
agent_commit_share0.01
toolchain_manifestsbenchmarks/pom.xml, core/pom.xml, coverage-report/pom.xml, dist/pom.xml, examples/pom.xml, karaf/pom.xml, pom.xml, servlet/pom.xml, websockets-jsr/pom.xml
dependency_bot_commit_share0
How it's scored
45/45Type-checkable codeJava (statically typed)
54.8/55Manageable file sizes6/1,503 source files over 60KB
Inputs used
primary_languageJava
largest_source_bytes97,458
source_files_sampled1,503
oversized_source_files6
How it's scored
0/40API schema (OpenAPI/GraphQL/proto)not applicable to this kind of software
0/20MCP servernot applicable to this kind of software
40/40Runnable examplesexamples
Inputs used
example_dirsexamples
has_mcp_signalno
api_schema_files
interfaces_expected_of
Excluded from scoring (no data or not applicable): API schema (OpenAPI/GraphQL/proto), MCP server. Remaining weights renormalized.

Key facts

3,758GitHub stars
100contributors
272commits, last 12 months
6days since last push
20releases
1bus factor
0open issues
Mavenpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token

More detail

Star and fork history 0 ★ / 1,054 ⇿
0Stars
1,054Forks
20Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

Only the most recent history is shown — this repository exceeds the collection window, so the earliest history is not captured.

02004006008001,0001,2001,054202013-122020-032026-07
Major 0Minor 0Patch 0

Each point covers 12 days.

OpenSSF Scorecard 5.8 / 10
5.8aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-21 11:54 UTC

10Binary-Artifactsno binaries found in the repo
n/aBranch-Protectioninternal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
7CI-Tests11 out of 14 merged PRs checked by a CI test -- score normalized to 7
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
7Code-ReviewFound 10/14 approved changesets -- score normalized to 7
10Contributorsproject has 69 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
0Dependency-Update-Toolno update tool detected
10Fuzzingproject is fuzzed
10Licenselicense file detected
10Maintained13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
0SASTSAST tool is not run on all commits -- score normalized to 0
10Security-Policysecurity policy file detected
0Signed-ReleasesProject has not signed or included provenance with any releases.
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
9Vulnerabilities1 existing vulnerabilities detected
Direct dependencies 37
RegistryPackageVersion constraintManifest
Mavenorg.jboss.logging:jboss-loggingcore/pom.xml
Mavenorg.jboss.xnio:xnio-apicore/pom.xml
Mavenorg.jboss.xnio:xnio-niocore/pom.xml
Mavenorg.jboss.threads:jboss-threadscore/pom.xml
Mavenorg.jacoco:org.jacoco.ant${version.org.jacoco}coverage-report/pom.xml
Mavenio.undertow:undertow-coredist/pom.xml
Mavenio.undertow:undertow-servletdist/pom.xml
Mavenio.undertow:undertow-examplesdist/pom.xml
Mavenio.undertow.build:undertow-checkstyle-config${version.io.undertow.build.checkstyle-config}pom.xml
Mavenio.undertow:undertow-core${project.version}pom.xml
Mavenio.undertow:undertow-examples${project.version}pom.xml
Mavenio.undertow:undertow-servlet${project.version}pom.xml
Mavenio.undertow:undertow-websockets-jsr${project.version}pom.xml
Mavenio.undertow:undertow-benchmarks${project.version}pom.xml
Mavenio.undertow.build:undertow-checkstyle-config${version.io.undertow.build.checkstyle-config}pom.xml
Mavenjakarta.servlet:jakarta.servlet-api${version.jakarta.servlet.jakarta-servlet-api}pom.xml
Mavenjakarta.annotation:jakarta.annotation-api${version.jakarta.annotation.jakarta-annotation-api}pom.xml
Mavenjakarta.websocket:jakarta.websocket-api${version.jakarta.websocket.jakarta-websocket-api}pom.xml
Mavenjakarta.websocket:jakarta.websocket-client-api${version.jakarta.websocket.jakarta-websocket-api}pom.xml
Mavenorg.jboss.classfilewriter:jboss-classfilewriter${version.org.jboss.classfilewriter}pom.xml
Mavenorg.jboss.logging:jboss-logging${version.org.jboss.logging}pom.xml
Mavenorg.jboss.logging:jboss-logging-processor${version.org.jboss.logging.processor}pom.xml
Mavenorg.jboss.logmanager:jboss-logmanager${version.org.jboss.logmanager}pom.xml
Mavenorg.jboss.xnio:xnio-api${version.xnio}pom.xml
Mavenorg.jboss.xnio:xnio-nio${version.xnio}pom.xml
Mavenorg.jboss.threads:jboss-threads${version.org.jboss.threads}pom.xml
Mavenorg.wildfly.common:wildfly-common${version.org.wildfly.common}pom.xml
Mavenio.smallrye.common:smallrye-common-constraint${version.io.smallrye.common}pom.xml
Mavenio.smallrye.common:smallrye-common-net${version.io.smallrye.common}pom.xml
Mavenorg.openjdk.jmh:jmh-core${version.jmh}pom.xml
Mavenio.undertow:undertow-coreservlet/pom.xml
Mavenjakarta.servlet:jakarta.servlet-apiservlet/pom.xml
Mavenjakarta.annotation:jakarta.annotation-apiservlet/pom.xml
Mavenio.undertow:undertow-corewebsockets-jsr/pom.xml
Mavenio.undertow:undertow-servletwebsockets-jsr/pom.xml
Mavenjakarta.websocket:jakarta.websocket-apiwebsockets-jsr/pom.xml
Mavenjakarta.websocket:jakarta.websocket-client-apiwebsockets-jsr/pom.xml
All dependencies 84

Full resolved dependency set from the GitHub dependency graph: 38 direct and 46 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
Mavenio.smallrye.common:smallrye-common-constraintdirect
Mavenio.smallrye.common:smallrye-common-constraint2.12.0direct
Mavenio.smallrye.common:smallrye-common-netdirect
Mavenio.smallrye.common:smallrye-common-net2.12.0direct
Mavenio.undertow.build:undertow-checkstyle-config2.0.0direct
Mavenio.undertow:undertow-benchmarks2.5.0.Alpha1-SNAPSHOTdirect
Mavenio.undertow:undertow-coredirect
Mavenio.undertow:undertow-core2.5.0.Alpha1-SNAPSHOTdirect
Mavenio.undertow:undertow-examples2.5.0.Alpha1-SNAPSHOTdirect
Mavenio.undertow:undertow-servletdirect
Mavenio.undertow:undertow-servlet2.5.0.Alpha1-SNAPSHOTdirect
Mavenio.undertow:undertow-websockets-jsrdirect
Mavenio.undertow:undertow-websockets-jsr2.5.0.Alpha1-SNAPSHOTdirect
Mavenjakarta.annotation:jakarta.annotation-apidirect
Mavenjakarta.annotation:jakarta.annotation-api2.1.1direct
Mavenjakarta.servlet:jakarta.servlet-apidirect
Mavenjakarta.servlet:jakarta.servlet-api6.1.0direct
Mavenjakarta.websocket:jakarta.websocket-apidirect
Mavenjakarta.websocket:jakarta.websocket-api2.1.1direct
Mavenjakarta.websocket:jakarta.websocket-client-apidirect
Mavenjakarta.websocket:jakarta.websocket-client-api2.1.1direct
Mavenorg.jacoco:org.jacoco.antdirect
Mavenorg.jboss.classfilewriter:jboss-classfilewriter1.3.0direct
Mavenorg.jboss.logging:jboss-loggingdirect
Mavenorg.jboss.logging:jboss-logging3.6.2direct
Mavenorg.jboss.logging:jboss-logging-processordirect
Mavenorg.jboss.logging:jboss-logging-processor3.0.4direct
Mavenorg.jboss.logmanager:jboss-logmanagerdirect
Mavenorg.jboss.logmanager:jboss-logmanager3.1.2direct
Mavenorg.jboss.threads:jboss-threadsdirect
Mavenorg.jboss.threads:jboss-threads3.9.2direct
Mavenorg.jboss.xnio:xnio-apidirect
Mavenorg.jboss.xnio:xnio-api3.8.16direct
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Mavenorg.jboss.xnio:xnio-nio3.8.16direct
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Mavenorg.openjdk.jmh:jmh-core1.21direct
Mavenorg.wildfly.common:wildfly-common2.0.1direct
Mavencom.github.spotbugs:spotbugs-maven-pluginindirect
Mavencom.github.spotbugs:spotbugs-maven-plugin4.9.8.3indirect
Mavencom.h2database:h2indirect
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Mavencom.twitter:hpackindirect
Mavencom.twitter:hpack1.0.2indirect
Mavenio.netty:netty-allindirect
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Mavenorg.apache.directory.server:apacheds-interceptor-kerberos2.0.0.AM26indirect
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Mavenorg.apache.directory.server:apacheds-test-framework2.0.0.AM26indirect
Mavenorg.apache.felix:maven-bundle-pluginindirect
Mavenorg.apache.felix:maven-bundle-plugin6.0.2indirect
Mavenorg.apache.httpcomponents:httpclientindirect
Mavenorg.apache.httpcomponents:httpclient4.5.14indirect
Mavenorg.apache.httpcomponents:httpmimeindirect
Mavenorg.apache.httpcomponents:httpmime4.5.14indirect
Mavenorg.apache.karaf.features:framework4.4.1indirect
Mavenorg.apache.karaf.tooling:karaf-maven-pluginindirect
Mavenorg.apache.karaf.tooling:karaf-maven-plugin4.4.1indirect
Mavenorg.apache.maven.plugins:maven-antrun-pluginindirect
Mavenorg.apache.maven.plugins:maven-checkstyle-pluginindirect
Mavenorg.apache.maven.plugins:maven-compiler-pluginindirect
Mavenorg.apache.maven.plugins:maven-dependency-pluginindirect
Mavenorg.apache.maven.plugins:maven-jar-pluginindirect
Mavenorg.apache.maven.plugins:maven-javadoc-pluginindirect
Mavenorg.apache.maven.plugins:maven-resources-pluginindirect
Mavenorg.apache.maven.plugins:maven-shade-pluginindirect
Mavenorg.apache.maven.plugins:maven-surefire-pluginindirect
Mavenorg.bitstrings.maven.plugins:dependencypath-maven-plugin1.1.1indirect
Mavenorg.codehaus.mojo:build-helper-maven-pluginindirect
Mavenorg.codehaus.mojo:exec-maven-pluginindirect
Mavenorg.easymock:easymockindirect
Mavenorg.easymock:easymock5.2.0indirect
Mavenorg.eclipse.m2e:lifecycle-mapping1.0.0indirect
Mavenorg.jacoco:jacoco-maven-pluginindirect
Mavenorg.jacoco:jacoco-maven-plugin0.8.14indirect
Mavenorg.openjdk.jmh:jmh-generator-annprocessindirect
Mavenorg.openjdk.jmh:jmh-generator-annprocess1.21indirect
Mavenorg.wildfly.openssl:wildfly-opensslindirect
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Mavenorg.zanata:zanata-maven-pluginindirect
Dependency advisories 0

Installing maven:io.undertow:undertow-core@2.4.2.Final pulls in 17 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.

No known advisories affect the assessed dependencies.

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statisticsMaven.