Cut a new project's first build download in half, and gate it by shai-almog · Pull Request #6213 · codenameone/CodenameOne

shai-almog · 2026-11-11T14:25:15Z

What a new developer saw

The first thing anyone does with Codename One is run a project from the initializr on a machine that has never built one. That build downloaded 346 MB before the simulator opened. Maven resolves a plugin's whole class path before its first goal, so every runtime dependency of the build tools was downloaded by a Hello World:

55 MB of ports (iOS, Android, Mac, Windows, Linux, ParparVM) that no simulator run opens
157 MB of ffmpeg natives for seven platforms, of which the machine can run one

It is 174 MB on a Mac now, and less on Linux and Windows, which take one ffmpeg architecture where a Mac takes two.

What changed

Ports are resolved when a target needs them. They are provided and optional in codenameone-maven-plugin and build-engine. AppBuilder.LocalBuild names the ports each local target reads, ProjectHost.getPortJar resolves one at the build tool's own version, and Executor.getResourceAsStream reads the class path first and those jars second. Maven and Gradle behave the same way.
ffmpeg is the host's alone. cn1-binaries-javase selects natives with OS-activated profiles; the Gradle plugin mirrors the table in PluginInfo.hostFfmpegPlatforms.
The desktop jar still plays media everywhere. javase-executable-jar resolves the other desktop platforms itself. A project with a javase module gets them through -Dcn1.ffmpeg.allPlatforms=true, which every generated launcher (scripts, Eclipse, IntelliJ, NetBeans, VS Code, the Initializr archives) and cn1:buildExecutableJar pass. An older project's launcher gets a build warning naming the property.

What stops it growing back

scripts/check-first-build-footprint.py (in archetype-smoke.yml) generates a project, builds what run.sh builds into an empty local repository, and fails on a port, on a native for another platform, on a host with no ffmpeg, or on the size budget. CI runs on Linux only, so it also holds every host's profile to a table.
scripts/sync-initializr-launchers.py (in starter-launchers.yml) fails on any launcher copy that builds the desktop jar without the property, command by command.
LocalBuildPortsTest, ExecutorPortJarTest, PortJarSelectionTest and DesktopNativesTest cover the target table, the resource lookup, the Gradle selection and the desktop natives.

Verified locally

Putting the iOS port back at runtime scope makes the footprint gate fail and name it.
ios-source, mac-source, local-javascript and android-source each resolve only their own ports from an empty repository, through Maven and through Gradle (gradle-maven-parity-test).
Hosted and javase-module desktop jars both carry the five desktop ffmpeg natives.
Tests and SpotBugs (zero findings) for build-engine, codenameone-maven-plugin and codenameone-gradle-plugin.

The Linux budget is derived from the Mac measurement; the first archetype-smoke run gives the real figure.

🤖 Generated with Claude Code

shai-almog · 2026-11-11T14:48:37Z

Compared 12 screenshots: 12 matched.
✅ JavaSE simulator integration screenshots matched stored baselines.

shai-almog · 2026-11-11T15:35:18Z

Compared 195 screenshots: 195 matched.

Native Android coverage

📊 Line coverage: 19.17% (56159/292885 lines covered) [HTML preview] (artifact android-coverage-report, jacocoAndroidReport/html/index.html)
- Other counters: instruction 18.13% (270547/1492353), branch 12.38% (19675/158943), complexity 10.36% (15847/153017), method 15.74% (11411/72518), class 27.94% (2248/8045)
- Lowest covered classes
  - kotlin.collections.unsigned.kotlin.collections.unsigned.UArraysKt___UArraysKt – 0.00% (0/2396 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.ClassReader – 0.00% (0/1524 lines covered)
  - androidx.compose.runtime.androidx.compose.runtime.LinkComposer – 0.00% (0/1430 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.MethodWriter – 0.00% (0/922 lines covered)
  - kotlinx.coroutines.channels.kotlinx.coroutines.channels.BufferedChannel – 0.00% (0/863 lines covered)
  - kotlin.sequences.kotlin.sequences.SequencesKt___SequencesKt – 0.00% (0/744 lines covered)
  - com.google.common.cache.com.google.common.cache.LocalCache$Segment – 0.00% (0/726 lines covered)
  - okio.okio.Buffer – 0.00% (0/687 lines covered)
  - kotlin.text.kotlin.text.StringsKt___StringsKt – 0.00% (0/630 lines covered)
  - com.codename1.androidcompat.rt.com.codename1.androidcompat.rt.TextXmlPullParser – 0.00% (0/623 lines covered)

✅ Native Android screenshot tests passed.

Native Android coverage

📊 Line coverage: 19.17% (56159/292885 lines covered) [HTML preview] (artifact android-coverage-report, jacocoAndroidReport/html/index.html)
- Other counters: instruction 18.13% (270547/1492353), branch 12.38% (19675/158943), complexity 10.36% (15847/153017), method 15.74% (11411/72518), class 27.94% (2248/8045)
- Lowest covered classes
  - kotlin.collections.unsigned.kotlin.collections.unsigned.UArraysKt___UArraysKt – 0.00% (0/2396 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.ClassReader – 0.00% (0/1524 lines covered)
  - androidx.compose.runtime.androidx.compose.runtime.LinkComposer – 0.00% (0/1430 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.MethodWriter – 0.00% (0/922 lines covered)
  - kotlinx.coroutines.channels.kotlinx.coroutines.channels.BufferedChannel – 0.00% (0/863 lines covered)
  - kotlin.sequences.kotlin.sequences.SequencesKt___SequencesKt – 0.00% (0/744 lines covered)
  - com.google.common.cache.com.google.common.cache.LocalCache$Segment – 0.00% (0/726 lines covered)
  - okio.okio.Buffer – 0.00% (0/687 lines covered)
  - kotlin.text.kotlin.text.StringsKt___StringsKt – 0.00% (0/630 lines covered)
  - com.codename1.androidcompat.rt.com.codename1.androidcompat.rt.TextXmlPullParser – 0.00% (0/623 lines covered)

Benchmark Results

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	scalar fallback (no native SIMD)
SIMD int-add (64K x300)	java 181ms / native 152ms = 1.1x speedup
SIMD float-mul (64K x300)	java 124ms / native 129ms = 0.9x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	gated to scalar (CPU autovectorizes scalar; explicit SIMD not beneficial here)
Base64 CN1 encode	68.000 ms
Base64 CN1 decode	67.000 ms
Base64 native encode	370.000 ms
Base64 encode ratio (CN1/native)	0.184x (81.6% faster)
Base64 native decode	236.000 ms
Base64 decode ratio (CN1/native)	0.284x (71.6% faster)
Image encode benchmark status	skipped (SIMD unsupported)

github-actions · 2026-11-11T15:45:00Z

✅ Continuous Quality Report

Test & Coverage

✅ Tests: 15190 total, 0 failed, 170 skipped
📊 Line coverage: 65.70% [HTML preview] [Download]
- Lowest covered classes
  - com.codename1.io.zip.ZipArchiveOutputStream – 0.00%
  - com.codename1.gaming.level.GameSceneView – 0.00%
  - com.codename1.security.NativeCryptoEngine – 0.00%
  - com.codename1.crash.CrashProtection – 0.00%
  - com.codename1.mapping.JsonValues – 0.00%
  - com.codename1.payment.CommerceManager – 0.00%
  - com.codename1.io.outbox.Outbox – 0.00%
  - com.codename1.ai.LocalLlmClient – 0.00%
  - com.codename1.security.CertificateRequest – 0.00%
  - com.codename1.wearable.WearableMessage – 0.00%

Static Analysis

SpotBugs [Report archive]
- ✅ ByteCodeTranslator: 0 findings (no issues)
- ✅ android: 0 findings (no issues)
- ✅ android-compat: 0 findings (no issues)
- ✅ android-res-compiler: 0 findings (no issues)
- ✅ backend: 0 findings (no issues)
- ✅ backend-test: 0 findings (no issues)
- ✅ build-engine: 0 findings (no issues)
- ✅ build-hint-catalog: 0 findings (no issues)
- ✅ build-hint-tools: 0 findings (no issues)
- ✅ codenameone-gradle-plugin: 0 findings (no issues)
- ✅ codenameone-maven-plugin: 0 findings (no issues)
- ✅ compose-compat: 0 findings (no issues)
- ✅ core-unittests: 0 findings (no issues)
- ✅ desktop-compat-runtime: 0 findings (no issues)
- ✅ fxml-compiler: 0 findings (no issues)
- ✅ ios: 0 findings (no issues)
- ✅ javac: 0 findings (no issues)
- ✅ javafx-compat: 0 findings (no issues)
- ✅ project-model: 0 findings (no issues)
- ✅ python-runtime: 0 findings (no issues)
- ✅ python-transpiler: 0 findings (no issues)
- ✅ swing-compat: 0 findings (no issues)
✅ PMD: 0 findings (no issues) [Report archive]
✅ Checkstyle: 0 findings (no issues) [Report archive]

Generated automatically by the PR CI workflow.

github-actions · 2026-11-11T18:22:06Z

Developer Guide build artifacts are available for download from this workflow run:

Developer Guide quality checks:

AsciiDoc linter: No issues found (report)
Vale: No alerts found (report)
Paragraph capitalization: No paragraph capitalization issues (report)
LanguageTool: No grammar matches (report)
Image references: No unused images detected (report)

shai-almog · 2026-11-11T18:24:29Z

Compared 193 screenshots: 193 matched.
✅ Native iOS Metal screenshot tests passed.

Benchmark Results

VM Translation Time: 0 seconds
Compilation Time: 3619 seconds

Build and Run Timing

Metric	Duration
Simulator Boot	61000 ms
Simulator Boot (Run)	1000 ms
App Install	23000 ms
App Launch	8000 ms
Test Execution	480000 ms

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 124ms / native 4ms = 31.0x speedup
SIMD float-mul (64K x300)	java 86ms / native 4ms = 21.5x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	active (NEON-accelerated)
Base64 CN1 encode	51.000 ms
Base64 CN1 decode	88.000 ms
Base64 native encode	1136.000 ms
Base64 encode ratio (CN1/native)	0.045x (95.5% faster)
Base64 native decode	1117.000 ms
Base64 decode ratio (CN1/native)	0.079x (92.1% faster)
Base64 SIMD encode	90.000 ms
Base64 encode ratio (SIMD/CN1)	1.765x (76.5% slower)
Base64 SIMD decode	49.000 ms
Base64 decode ratio (SIMD/CN1)	0.557x (44.3% faster)
Base64 encode ratio (SIMD/native)	0.079x (92.1% faster)
Base64 decode ratio (SIMD/native)	0.044x (95.6% faster)
Image encode benchmark iterations	100
Image createMask (SIMD off)	5.000 ms
Image createMask (SIMD on)	2.000 ms
Image createMask ratio (SIMD on/off)	0.400x (60.0% faster)
Image applyMask (SIMD off)	37.000 ms
Image applyMask (SIMD on)	31.000 ms
Image applyMask ratio (SIMD on/off)	0.838x (16.2% faster)
Image modifyAlpha (SIMD off)	38.000 ms
Image modifyAlpha (SIMD on)	35.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.921x (7.9% faster)
Image modifyAlpha removeColor (SIMD off)	44.000 ms
Image modifyAlpha removeColor (SIMD on)	35.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.795x (20.5% faster)

shai-almog · 2026-11-11T18:49:34Z

Compared 231 screenshots: 231 matched.
✅ JavaScript-port screenshot tests passed.

github-actions · 2026-11-11T19:00:57Z

Cloudflare Preview

URL: https://pr-6213-website-preview.codenameone.pages.dev
Branch: pr-6213-website-preview

shai-almog · 2026-11-11T19:34:10Z

Compared 188 screenshots: 188 matched.
✅ Native Apple TV (tvOS, Metal) screenshot tests passed.

shai-almog · 2026-11-11T19:55:35Z

Compared 192 screenshots: 192 matched.
✅ Native Mac screenshot tests passed.

Benchmark Results

VM Translation Time: 0 seconds
Compilation Time: 917 seconds

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 81ms / native 3ms = 27.0x speedup
SIMD float-mul (64K x300)	java 66ms / native 7ms = 9.4x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	active (NEON-accelerated)
Base64 CN1 encode	52.000 ms
Base64 CN1 decode	68.000 ms
Base64 native encode	959.000 ms
Base64 encode ratio (CN1/native)	0.054x (94.6% faster)
Base64 native decode	345.000 ms
Base64 decode ratio (CN1/native)	0.197x (80.3% faster)
Base64 SIMD encode	79.000 ms
Base64 encode ratio (SIMD/CN1)	1.519x (51.9% slower)
Base64 SIMD decode	50.000 ms
Base64 decode ratio (SIMD/CN1)	0.735x (26.5% faster)
Base64 encode ratio (SIMD/native)	0.082x (91.8% faster)
Base64 decode ratio (SIMD/native)	0.145x (85.5% faster)
Image encode benchmark iterations	100
Image createMask (SIMD off)	8.000 ms
Image createMask (SIMD on)	2.000 ms
Image createMask ratio (SIMD on/off)	0.250x (75.0% faster)
Image applyMask (SIMD off)	89.000 ms
Image applyMask (SIMD on)	76.000 ms
Image applyMask ratio (SIMD on/off)	0.854x (14.6% faster)
Image modifyAlpha (SIMD off)	99.000 ms
Image modifyAlpha (SIMD on)	121.000 ms
Image modifyAlpha ratio (SIMD on/off)	1.222x (22.2% slower)
Image modifyAlpha removeColor (SIMD off)	163.000 ms
Image modifyAlpha removeColor (SIMD on)	82.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.503x (49.7% faster)

shai-almog · 2026-11-11T20:55:07Z

Compared 196 screenshots: 196 matched.
✅ Native Mac screenshot tests passed.

Benchmark Results

VM Translation Time: 0 seconds
Compilation Time: 525 seconds

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 55ms / native 3ms = 18.3x speedup
SIMD float-mul (64K x300)	java 57ms / native 4ms = 14.2x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 native bridge	unavailable (CN1 + SIMD + image benchmarks only)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	active (NEON-accelerated)
Base64 CN1 encode	43.000 ms
Base64 CN1 decode	50.000 ms
Image encode benchmark iterations	100
Image createMask (SIMD off)	7.000 ms
Image createMask (SIMD on)	3.000 ms
Image createMask ratio (SIMD on/off)	0.429x (57.1% faster)
Image applyMask (SIMD off)	50.000 ms
Image applyMask (SIMD on)	49.000 ms
Image applyMask ratio (SIMD on/off)	0.980x (2.0% faster)
Image modifyAlpha (SIMD off)	48.000 ms
Image modifyAlpha (SIMD on)	41.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.854x (14.6% faster)
Image modifyAlpha removeColor (SIMD off)	44.000 ms
Image modifyAlpha removeColor (SIMD on)	51.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	1.159x (15.9% slower)

ParparVM vs HotSpot (JDK 25): macOS arm64

Runner CPU: Apple M1 (Virtual) (baseline macos-arm64)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 20% (time) / 25% (RAM) above its baseline in vm/selfhost/perf-baseline/ is a regression and fails; one that far below is an improvement, reported but not failed (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (HelloCodenameOne)	3	1.12x (base 0.96x, +17.2%)	0.90x (base 0.93x, -3.0%)	ok
translator (self)	3	0.66x (base 0.62x, +5.7%)	0.87x (base 0.78x, +10.7%)	ok
intArithmetic	3	1.05x (base 1.03x, +1.4%)	0.12x (base 0.12x, +1.8%)	ok
longArithmetic	3	1.02x (base 1.03x, -0.4%)	0.11x (base 0.07x, +63.6%)	ok
mathTranscendental	3	0.98x (base 1.01x, -2.3%)	0.12x (base 0.12x, -0.1%)	ok
arraySequential	3	0.45x (base 0.42x, +8.2%)	0.53x (base 0.53x, +0.3%)	ok
arrayRandom	3	0.98x (base 0.99x, -0.6%)	0.33x (base 0.32x, +0.3%)	ok
objectAllocation	3	1.00x (base 1.11x, -9.8%)	0.90x (base 0.72x, +25.0%)	ok
valueEscape	3	0.51x (base 0.51x, +1.2%)	0.09x (base 0.09x, +0.9%)	ok
hashMapChurn	3	1.09x (base 1.18x, -6.9%)	0.08x (base 0.07x, +12.3%)	ok
stringBuilding	3	0.99x (base 0.84x, +17.7%)	0.46x (base 0.46x, -1.2%)	ok
recursion	3	1.22x (base 1.24x, -0.9%)	0.12x (base 0.12x, +1.0%)	ok
quicksort	3	0.99x (base 1.01x, -1.8%)	0.11x (base 0.11x, +1.0%)	ok

Result: no regression

shai-almog · 2026-11-11T21:35:54Z

Compared 253 screenshots: 253 matched.
✅ Native Apple Watch (watchOS, Core Graphics) screenshot tests passed.

A project from the initializr downloaded 346 MB before its first simulator run. Maven resolves a plugin's whole class path before the first goal, so the build tools' runtime dependencies were every Hello World's: 55 MB of ports no simulator run opens and 157 MB of ffmpeg for seven platforms. It is 174 MB on a Mac now. - The ports are provided and optional in codenameone-maven-plugin and build-engine. AppBuilder.LocalBuild names the ports each local target reads, ProjectHost.getPortJar resolves one at the build tool's own version when that target is built, and Executor.getResourceAsStream reads the class path first and those jars second. Maven and Gradle both do this. - ffmpeg is the host's alone: cn1-binaries-javase selects the natives with OS-activated profiles, and the Gradle plugin mirrors the table. - The desktop jar runs on other machines, so it still carries every desktop platform's natives. javase-executable-jar resolves them itself; a project with a javase module gets them from -Dcn1.ffmpeg.allPlatforms=true, which every generated launcher and cn1:buildExecutableJar pass, and generate-desktop-app-wrapper warns when a launcher does not. scripts/check-first-build-footprint.py (archetype-smoke.yml) generates a project, builds it into an empty local repository and fails on a port, on a native for another platform, on a host with no ffmpeg, or on the budget. It also holds every host's profile to a table, since CI resolves on Linux only. scripts/sync-initializr-launchers.py now fails on any launcher copy that builds the desktop jar without the property. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

The step inherited the JDK 8 the framework builds with, and the plugin refuses a simulator build on anything older than 11. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

Passing runs take 35 to 39 minutes there, and the 40 minute limit cancelled the nightly and pull request runs alike. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

github-actions · 2026-11-12T01:49:01Z

✅ ByteCodeTranslator Quality Report

Test & Coverage

✅ Tests: 934 total, 0 failed, 55 skipped

Benchmark Results

Execution Time: 6124 ms
Hotspots (Top 20 sampled methods):
- 10.95% java.lang.System.identityHashCode (97 samples)
- 6.77% com.codename1.tools.translator.BytecodeMethod.equals (60 samples)
- 6.09% java.lang.Object.hashCode (54 samples)
- 3.39% java.lang.StringBuilder.append (30 samples)
- 3.27% java.util.ArrayList.indexOf (29 samples)
- 3.05% com.codename1.tools.translator.NativeSymbolIndex.extend (27 samples)
- 2.03% com.codename1.tools.translator.classfile.analysis.Frame.execute (18 samples)
- 2.03% com.codename1.tools.translator.BytecodeMethod.updateInlinableFieldDependencies (18 samples)
- 1.92% com.codename1.tools.translator.Parser.cullMethods (17 samples)
- 1.92% java.lang.String.equals (17 samples)
- 1.58% com.codename1.tools.translator.ByteCodeClass.fillVirtualMethodTable (14 samples)
- 1.58% com.codename1.tools.translator.classfile.analysis.Frame.merge (14 samples)
- 1.58% java.util.HashMap.hash (14 samples)
- 1.24% com.codename1.tools.translator.bytecodes.Invoke.resolveDirectTarget (11 samples)
- 1.24% com.codename1.tools.translator.DeadFieldElimination.run (11 samples)
- 1.24% com.codename1.tools.translator.ByteCodeClass.hasDeclaredMethod (11 samples)
- 1.13% com.codename1.tools.translator.JavascriptReachability.enqueueResolved (10 samples)
- 1.13% java.io.FileInputStream.open0 (10 samples)
- 1.13% java.io.FileOutputStream.writeBytes (10 samples)
- 1.13% com.codename1.tools.translator.Parser.collectTypeTests (10 samples)
⚠️ Coverage report not generated.

Static Analysis

✅ SpotBugs: no findings (report was not generated by the build).
⚠️ PMD report not generated.
⚠️ Checkstyle report not generated.

Generated automatically by the PR CI workflow.

shai-almog and others added 3 commits November 12, 2026 00:32

ci: run the first-build footprint gate on a JDK the simulator accepts

f024fcf

The step inherited the JDK 8 the framework builds with, and the plugin refuses a simulator build on anything older than 11. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

ci: give the macOS starter launchers job room to finish

80f5d98

Passing runs take 35 to 39 minutes there, and the 40 minute limit cancelled the nightly and pull request runs alike. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

shai-almog force-pushed the first-build-download-diet branch from 0e9a74e to 80f5d98 Compare November 11, 2026 22:32

shai-almog merged commit d069e65 into master Nov 12, 2026
78 of 80 checks passed

shai-almog deleted the first-build-download-diet branch November 12, 2026 02:03

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Cut a new project's first build download in half, and gate it - #6213

Cut a new project's first build download in half, and gate it#6213
shai-almog merged 3 commits into
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shai-almog commented Nov 11, 2026

What a new developer saw

What changed

What stops it growing back

Verified locally

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Native Android coverage

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✅ Continuous Quality Report

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Static Analysis

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Cloudflare Preview

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Benchmark Results

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ParparVM vs HotSpot (JDK 25): macOS arm64

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github-actions Bot commented Nov 12, 2026

✅ ByteCodeTranslator Quality Report

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shai-almog commented Nov 11, 2026 •

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shai-almog commented Nov 11, 2026 •

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