Very spicy additions to the Java programming language.
This report presents the forensic synthetic code analysis of projectlombok/lombok, a Java project with 13,474 GitHub stars. SynthScan v2.0 examined 141,802 lines of code across 2054 source files, recording 254 pattern matches distributed across 8 syntactic categories. The overall adjusted score of 19.6 places this repository in the Moderate AI signal band.
The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).
Longitudinal tracking requires multiple scan runs. Once this repository is re-scanned after new commits land, this chart will visualise how the synthetic code signal evolves over time — enabling you to detect whether AI authorship is growing, stabilising, or being actively corrected by human engineers.
Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.
This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.
The scanner identified 254 distinct pattern matches across 8 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.
Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| CRITICAL | test/core/src/lombok/RunTestsViaEcj.java | 240 | org.eclipse.jdt.internal.core.CompilationUnit ccu = new org.eclipse.jdt.internal.core.CompilationUnit(null, null, nul | CODE |
| CRITICAL | …ource/after-delombok/CheckerFrameworkSuperBuilder.java | 91 | public abstract C build(CheckerFrameworkSuperBuilder.Parent.@org.checkerframework.checker.calledmethods.qual.CalledMe | CODE |
| CRITICAL | …ource/after-delombok/CheckerFrameworkSuperBuilder.java | 118 | public CheckerFrameworkSuperBuilder.Parent build(CheckerFrameworkSuperBuilder.Parent.@org.checkerframework.checker.ca | CODE |
| CRITICAL | …ource/after-delombok/CheckerFrameworkSuperBuilder.java | 198 | public abstract C build(CheckerFrameworkSuperBuilder.ZChild.@org.checkerframework.checker.calledmethods.qual.CalledMe | CODE |
| CRITICAL | …ource/after-delombok/CheckerFrameworkSuperBuilder.java | 225 | public CheckerFrameworkSuperBuilder.ZChild build(CheckerFrameworkSuperBuilder.ZChild.@org.checkerframework.checker.ca | CODE |
| CRITICAL | …sform/resource/after-delombok/JacksonizedOnRecord.java | 8 | @com.fasterxml.jackson.databind.annotation.JsonDeserialize(builder = JacksonizedOnRecord.JacksonizedOnRecordBuilder.clas | CODE |
| CRITICAL | …sform/resource/after-delombok/JacksonizedOnRecord.java | 14 | @com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder(withPrefix = "", buildMethodName = "build") | CODE |
| CRITICAL | …/resource/after-delombok/BuilderSingularGuavaMaps.java | 35 | if (this.battleaxes == null) this.battleaxes = com.google.common.collect.ImmutableMap.builder(); | CODE |
| CRITICAL | …/resource/after-delombok/BuilderSingularGuavaMaps.java | 45 | if (this.battleaxes == null) this.battleaxes = com.google.common.collect.ImmutableMap.builder(); | CODE |
| CRITICAL | …/resource/after-delombok/BuilderSingularGuavaMaps.java | 58 | if (this.vertices == null) this.vertices = com.google.common.collect.ImmutableSortedMap.naturalOrder(); | CODE |
| CRITICAL | …/resource/after-delombok/BuilderSingularGuavaMaps.java | 68 | if (this.vertices == null) this.vertices = com.google.common.collect.ImmutableSortedMap.naturalOrder(); | CODE |
| CRITICAL | …/resource/after-delombok/BuilderSingularGuavaMaps.java | 81 | if (this.rawMap == null) this.rawMap = com.google.common.collect.ImmutableBiMap.builder(); | CODE |
| CRITICAL | …/resource/after-delombok/BuilderSingularGuavaMaps.java | 91 | if (this.rawMap == null) this.rawMap = com.google.common.collect.ImmutableBiMap.builder(); | CODE |
| CRITICAL | …m/resource/after-delombok/CheckerFrameworkBuilder.java | 98 | public CheckerFrameworkBuilder build(CheckerFrameworkBuilder.@org.checkerframework.checker.calledmethods.qual.CalledMe | CODE |
| CRITICAL | …orm/resource/after-delombok/BuilderWithDeprecated.java | 99 | if (this.numbers == null) this.numbers = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …orm/resource/after-delombok/BuilderWithDeprecated.java | 110 | if (this.numbers == null) this.numbers = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerCommons.java | 4 | private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LoggerCommons.cl | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerCommons.java | 9 | private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LoggerCommonsWit | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerCommons.java | 14 | private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog("DifferentName") | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerCommons.java | 19 | private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LoggerCommonsWit | CODE |
| CRITICAL | …sform/resource/after-delombok/LoggerFloggerRecord.java | 6 | private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingC | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 7 | com.google.common.base.Preconditions.checkNotNull(arg, "arg is marked non-null but is null"); | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 17 | com.google.common.base.Preconditions.checkNotNull(arg); | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 20 | com.google.common.base.Preconditions.checkNotNull(arg, "arg is marked non-null but is null"); | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 24 | com.google.common.base.Preconditions.checkNotNull(arg, "arg is marked non-null but is null"); | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 25 | com.google.common.base.Preconditions.checkNotNull(test); | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 28 | com.google.common.base.Preconditions.checkNotNull(arg, "arg is marked non-null but is null"); | CODE |
| CRITICAL⚡ | …ransform/resource/after-delombok/NonNullWithGuava.java | 34 | com.google.common.base.Preconditions.checkNotNull(test, "test is marked non-null but is null"); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 45 | if (this.cards == null) this.cards = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 55 | if (this.cards == null) this.cards = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 68 | if (this.frogs == null) this.frogs = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 78 | if (this.frogs == null) this.frogs = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 91 | if (this.rawSet == null) this.rawSet = com.google.common.collect.ImmutableSet.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 101 | if (this.rawSet == null) this.rawSet = com.google.common.collect.ImmutableSet.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 114 | if (this.passes == null) this.passes = com.google.common.collect.ImmutableSortedSet.naturalOrder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 124 | if (this.passes == null) this.passes = com.google.common.collect.ImmutableSortedSet.naturalOrder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 137 | if (this.users == null) this.users = com.google.common.collect.ImmutableTable.builder(); | CODE |
| CRITICAL | …after-delombok/SuperBuilderSingularToBuilderGuava.java | 147 | if (this.users == null) this.users = com.google.common.collect.ImmutableTable.builder(); | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerFlogger.java | 4 | private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingCl | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerFlogger.java | 9 | private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingCl | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerFlogger.java | 15 | private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingC | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerFlogger.java | 22 | private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingCl | CODE |
| CRITICAL⚡ | …t/transform/resource/after-delombok/LoggerFlogger.java | 29 | private static final com.google.common.flogger.FluentLogger log = com.google.common.flogger.FluentLogger.forEnclosingC | CODE |
| CRITICAL | …rce/after-delombok/BuilderSingularRedirectToGuava.java | 34 | if (this.dangerMice == null) this.dangerMice = com.google.common.collect.ImmutableSet.builder(); | CODE |
| CRITICAL | …rce/after-delombok/BuilderSingularRedirectToGuava.java | 44 | if (this.dangerMice == null) this.dangerMice = com.google.common.collect.ImmutableSet.builder(); | CODE |
| CRITICAL | …rce/after-delombok/BuilderSingularRedirectToGuava.java | 57 | if (this.things == null) this.things = com.google.common.collect.ImmutableSortedMap.naturalOrder(); | CODE |
| CRITICAL | …rce/after-delombok/BuilderSingularRedirectToGuava.java | 67 | if (this.things == null) this.things = com.google.common.collect.ImmutableSortedMap.naturalOrder(); | CODE |
| CRITICAL | …rce/after-delombok/BuilderSingularRedirectToGuava.java | 80 | if (this.doohickeys == null) this.doohickeys = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …rce/after-delombok/BuilderSingularRedirectToGuava.java | 90 | if (this.doohickeys == null) this.doohickeys = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …esource/after-delombok/JacksonizedBuilderSingular.java | 8 | @com.fasterxml.jackson.databind.annotation.JsonDeserialize(builder = JacksonizedBuilderSingular.JacksonizedBuilderSingul | CODE |
| CRITICAL | …esource/after-delombok/JacksonizedBuilderSingular.java | 29 | @com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder(withPrefix = "", buildMethodName = "build") | CODE |
| CRITICAL | …esource/after-delombok/JacksonizedBuilderSingular.java | 116 | if (this.guavaAny == null) this.guavaAny = com.google.common.collect.ImmutableMap.builder(); | CODE |
| CRITICAL | …esource/after-delombok/JacksonizedBuilderSingular.java | 126 | if (this.guavaAny == null) this.guavaAny = com.google.common.collect.ImmutableMap.builder(); | CODE |
| CRITICAL | …esource/after-delombok/JacksonizedBuilderSingular.java | 139 | if (this.guavaValues == null) this.guavaValues = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …esource/after-delombok/JacksonizedBuilderSingular.java | 150 | if (this.guavaValues == null) this.guavaValues = com.google.common.collect.ImmutableList.builder(); | CODE |
| CRITICAL | …resource/after-delombok/JacksonizedNoConfigChoice.java | 1 | @com.fasterxml.jackson.databind.annotation.JsonDeserialize(builder = JacksonizedNoConfigChoice.JacksonizedNoConfigChoice | CODE |
| CRITICAL | …resource/after-delombok/JacksonizedNoConfigChoice.java | 11 | @com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder(withPrefix = "", buildMethodName = "build") | CODE |
| CRITICAL | …urce/after-delombok/JacksonizedSuperBuilderSimple.java | 4 | @com.fasterxml.jackson.databind.annotation.JsonDeserialize(builder = JacksonizedSuperBuilderSimple.Parent.ParentBuilder | CODE |
| CRITICAL | …urce/after-delombok/JacksonizedSuperBuilderSimple.java | 39 | @com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder(withPrefix = "", buildMethodName = "build") | CODE |
| CRITICAL | …resource/after-delombok/JacksonizedBuilderComplex.java | 4 | @com.fasterxml.jackson.databind.annotation.JsonDeserialize(builder = JacksonizedBuilderComplex.TestVoidName.class) | CODE |
| 159 more matches not shown… | ||||
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | test/configuration/resource/configurationRoot/out.txt | 61 | lombok.accessors.prefix += m_ | COMMENT |
| LOW | test/configuration/resource/configurationRoot/out.txt | 81 | # 4: lombok.addGeneratedAnnotation = true | COMMENT |
| LOW | …rm/resource/before/FieldDefaultsViaConfigOnRecord.java | 1 | // version 14: | COMMENT |
| LOW | src/core/lombok/eclipse/EclipseAST.java | 101 | COMMENT | |
| LOW | src/core/lombok/eclipse/EclipseAST.java | 141 | } | COMMENT |
| LOW | src/core/lombok/eclipse/EclipseAST.java | 161 | // in.close(); | COMMENT |
| LOW | …ore/lombok/eclipse/handlers/SetGeneratedByVisitor.java | 941 | // public boolean visit(LambdaExpression node, BlockScope scope){ return true;} | COMMENT |
| LOW | …c/core/lombok/eclipse/handlers/HandleSneakyThrows.java | 121 | // return handleField(annotationNode, (FieldDeclaration)owner.get(), exceptions); | COMMENT |
| LOW | …c/core/lombok/eclipse/handlers/HandleSneakyThrows.java | 141 | // for (DeclaredException exception : exceptions) { | COMMENT |
| LOW | src/core/lombok/core/handlers/HandlerUtil.java | 421 | "org.checkerframework.common.value.qual.MinLen", | COMMENT |
| LOW | src/utils/lombok/javac/JavacTreeMaker.java | 841 | // private static final MethodId<JCTypeUnion> TypeUnion = MethodId("TypeUnion"); | COMMENT |
| LOW | …ombok/javac/java8/CommentCollectingScannerFactory.java | 41 | // the lower bound for T, as a synthetic accessor for the make with returntype ScannerFactory) for that make method w | COMMENT |
| LOW | …ombok/javac/java6/CommentCollectingScannerFactory.java | 41 | // | COMMENT |
| LOW | …ombok/javac/java7/CommentCollectingScannerFactory.java | 41 | // is actually on the classpath (either make() for javac6-, or make(Context) for javac7+). | COMMENT |
| LOW | …c/eclipseAgent/lombok/eclipse/agent/PatchDelegate.java | 401 | // if (ref.resolvedType != null) { | COMMENT |
| LOW | …c/eclipseAgent/lombok/eclipse/agent/PatchDelegate.java | 421 | // char[] name = md.selector; | COMMENT |
| LOW | …c/eclipseAgent/lombok/eclipse/agent/PatchDelegate.java | 441 | // } | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | …c/core/lombok/eclipse/handlers/EclipseHandlerUtil.java | 1461 | if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter. | CODE |
| MEDIUM | …c/core/lombok/eclipse/handlers/EclipseHandlerUtil.java | 1476 | if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter. | CODE |
| MEDIUM | src/core/lombok/javac/handlers/JavacHandlerUtil.java | 1050 | if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter. | CODE |
| MEDIUM | src/core/lombok/javac/handlers/JavacHandlerUtil.java | 1065 | if (ann.getInstance().value() == AccessLevel.NONE) return null; //Definitely WONT have a getter. | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW⚡ | src/core/lombok/javac/apt/LombokProcessor.java | 326 | // Step 1: Take all CUs which aren't already in the map. Give them the first priority level. | COMMENT |
| LOW⚡ | src/core/lombok/javac/apt/LombokProcessor.java | 336 | // Step 2: For all CUs (in the map, not the roundEnv!), run them across all handlers at their current prio level. | COMMENT |
| LOW | src/core/lombok/javac/apt/LombokProcessor.java | 348 | // Step 3: Push up all CUs to the next level. Set level to null if there is no next level. | COMMENT |
| LOW | src/core/lombok/javac/apt/LombokProcessor.java | 367 | // Step 4: If ALL values are null, quit. Else, either do another loop right now or force a resolution reset by forcin | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW⚡ | src/core/lombok/javac/apt/LombokProcessor.java | 326 | // Step 1: Take all CUs which aren't already in the map. Give them the first priority level. | COMMENT |
| LOW⚡ | src/core/lombok/javac/apt/LombokProcessor.java | 336 | // Step 2: For all CUs (in the map, not the roundEnv!), run them across all handlers at their current prio level. | COMMENT |
| LOW | src/core/lombok/javac/apt/LombokProcessor.java | 348 | // Step 3: Push up all CUs to the next level. Set level to null if there is no next level. | COMMENT |
| LOW | src/core/lombok/javac/apt/LombokProcessor.java | 367 | // Step 4: If ALL values are null, quit. Else, either do another loop right now or force a resolution reset by forcin | COMMENT |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| MEDIUM | website/templates/_scaffold.html | 34 | <#macro scaffold load=[] title='Project Lombok'> | CODE |
| MEDIUM | website/templates/features/_features.html | 66 | <#macro scaffold title logline load=[]> | CODE |
| MEDIUM | website/templates/setup/_setup.html | 17 | <#macro scaffold title load=[]> | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | website/templates/contributing/contributing.html | 30 | To create new features and add them to project lombok itself, send us pull requests via github. However, before you | CODE |
| LOW | src/installer/lombok/installer/InstallerGUI.java | 941 | "Don't forget to:<ul><li> add <code>lombok.jar</code> to your projects,<li><b>exit and start</b> your IDE,<li><b>rebu | CODE |
| Severity | File | Line | Snippet | Context |
|---|---|---|---|---|
| LOW | website/resources/js/main.js | 36 | function aButtonsRespondToSpacebar() { | CODE |