Repository Analysis

eclipse-vertx/vert.x

Vert.x is a tool-kit for building reactive applications on the JVM

5.6 Low AI signal View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of eclipse-vertx/vert.x, a Java project with 14,676 GitHub stars. SynthScan v2.0 examined 250,535 lines of code across 1273 source files, recording 138 pattern matches distributed across 7 syntactic categories. The overall adjusted score of 5.6 places this repository in the Low 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).

5.6
Adjusted Score
5.6
Raw Score
100%
Time Factor
2026-07-13
Last Push
14.7K
Stars
Java
Language
250.5K
Lines of Code
1.3K
Files
138
Pattern Hits
2026-07-14
Scan Date
0.09
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

This chart maps the temporal evolution of the adjusted synthetic code score across successive scan runs. An upward trajectory indicates ongoing incorporation of AI-generated code or expanding LLM-assisted scaffolding; a stable or declining trajectory may reflect active human refactoring, code removal, or the adoption of stricter authorship policies. The dashed secondary line (right axis) independently tracks total raw pattern hit count, which can diverge from the normalised score when codebase size changes significantly between scans.

Severity Breakdown

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.

CRITICAL 110HIGH 0MEDIUM 0LOW 28

Directory Score Breakdown

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.

Pattern Findings

The scanner identified 138 distinct pattern matches across 7 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.

Hallucination Indicators110 hits · 1365 pts
SeverityFileLineSnippetContext
CRITICAL…main/java/io/vertx/core/logging/Log4j2LogDelegate.java34 logger = (ExtendedLogger) org.apache.logging.log4j.LogManager.getLogger(name);CODE
CRITICAL…re/src/test/java/io/vertx/test/core/AsyncTestBase.java529 assertion.accept(org.assertj.core.api.Assertions.assertThat(actual));CODE
CRITICAL…re/src/test/java/io/vertx/test/core/AsyncTestBase.java552 assertion.accept(org.assertj.core.api.Assertions.assertThat(actual));CODE
CRITICAL…re/src/test/java/io/vertx/test/core/AsyncTestBase.java576 assertion.accept(org.assertj.core.api.Assertions.assertThat(actual));CODE
CRITICAL…core/src/test/java/io/vertx/tests/http/Http1xTest.java3520 io.netty.handler.codec.http.HttpVersion.valueOf("");CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java512 ws.writeFrame(io.vertx.core.http.WebSocketFrame.binaryFrame(buff, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java706 assertNullPointerException(() -> io.vertx.core.http.WebSocketFrame.binaryFrame(null, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java707 assertNullPointerException(() -> io.vertx.core.http.WebSocketFrame.textFrame(null, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java708 assertNullPointerException(() -> io.vertx.core.http.WebSocketFrame.continuationFrame(null, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java891 frame = io.vertx.core.http.WebSocketFrame.binaryFrame(buff, false);CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java893 frame = io.vertx.core.http.WebSocketFrame.continuationFrame(buff, j == frames - 1);CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java899 frame = io.vertx.core.http.WebSocketFrame.textFrame(str, false);CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java901 frame = io.vertx.core.http.WebSocketFrame.continuationFrame(buff, j == frames - 1);CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java1036 ws.writeFrame(io.vertx.core.http.WebSocketFrame.binaryFrame(buff, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java1073 ws.writeFrame(io.vertx.core.http.WebSocketFrame.binaryFrame(buff, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java1106 ws.writeFrame(io.vertx.core.http.WebSocketFrame.binaryFrame(buff, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java1169 ws.writeFrame(io.vertx.core.http.WebSocketFrame.binaryFrame(buff, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java1197 ws.writeFrame(io.vertx.core.http.WebSocketFrame.binaryFrame(buff, true));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java2497 ws.writeFrame(io.vertx.core.http.WebSocketFrame.pingFrame(Buffer.buffer(pingBody)));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java2516 ws.writeFrame(io.vertx.core.http.WebSocketFrame.pingFrame(Buffer.buffer(pingBody)));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java2528 ws.writeFrame(io.vertx.core.http.WebSocketFrame.pongFrame(Buffer.buffer(pingBody)));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java2553 ws.writeFrame(io.vertx.core.http.WebSocketFrame.pongFrame(Buffer.buffer(pingBody)));CODE
CRITICAL…e/src/test/java/io/vertx/tests/http/WebSocketTest.java3434 ws.writeFrame(io.vertx.core.http.WebSocketFrame.textFrame(randomAlphaString(512), true));CODE
CRITICAL…/src/test/java/io/vertx/tests/http/HttpMethodTest.java156 assertSame(HttpMethod.fromNetty(io.netty.handler.codec.http.HttpMethod.valueOf("GET")), HttpMethod.GET);CODE
CRITICAL…/src/test/java/io/vertx/tests/http/HttpMethodTest.java158 assertSame(HttpMethod.fromNetty(io.netty.handler.codec.http.HttpMethod.valueOf("POST")), HttpMethod.POST);CODE
CRITICAL…/src/test/java/io/vertx/tests/http/HttpMethodTest.java160 assertSame(HttpMethod.fromNetty(io.netty.handler.codec.http.HttpMethod.valueOf("PUT")), HttpMethod.PUT);CODE
CRITICAL…/src/test/java/io/vertx/tests/http/HttpMethodTest.java167 assertSame(HttpMethod.fromNetty(io.netty.handler.codec.http.HttpMethod.valueOf("QUERY")), HttpMethod.QUERY);CODE
CRITICAL…/src/test/java/io/vertx/tests/http/HttpMethodTest.java169 assertEquals(HttpMethod.fromNetty(io.netty.handler.codec.http.HttpMethod.valueOf("foo")).name(), "foo");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java548 CharSequence name = io.vertx.core.http.HttpHeaders.createOptimized("heaDer");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java549 CharSequence vAlue = io.vertx.core.http.HttpHeaders.createOptimized("vAlue");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java550 CharSequence Value = io.vertx.core.http.HttpHeaders.createOptimized("Value");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java559 CharSequence name = io.vertx.core.http.HttpHeaders.createOptimized("heaDer");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java560 CharSequence vAlue = io.vertx.core.http.HttpHeaders.createOptimized("vAlue");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java561 CharSequence Value = io.vertx.core.http.HttpHeaders.createOptimized("Value");CODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java590 mmap.add("header", Arrays.asList(io.vertx.core.http.HttpHeaders.createOptimized("value1"), io.vertx.core.http.HttpHeCODE
CRITICAL…test/java/io/vertx/tests/http/headers/HeadersTest.java596 mmap.set("header", Arrays.asList(io.vertx.core.http.HttpHeaders.createOptimized("value1"), io.vertx.core.http.HttpHeCODE
CRITICAL…s/http/compression/Http1xCompressionThresholdTest.java58 .addCompressor(io.vertx.tests.http.compression.CompressionConfig.gzip(6).compressor)CODE
CRITICAL…s/http/compression/Http1xCompressionThresholdTest.java80 .addCompressor(io.vertx.tests.http.compression.CompressionConfig.gzip(6).compressor)CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java46 list.add(new Object[] { io.vertx.tests.http.compression.CompressionConfig.gzip(1) });CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java47 list.add(new Object[] { io.vertx.tests.http.compression.CompressionConfig.gzip(6) });CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java48 list.add(new Object[] { io.vertx.tests.http.compression.CompressionConfig.gzip(9) });CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java50 list.add(new Object[] { io.vertx.tests.http.compression.CompressionConfig.zstd() });CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java52 list.add(new Object[] { io.vertx.tests.http.compression.CompressionConfig.snappy() });CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java53 list.add(new Object[] { io.vertx.tests.http.compression.CompressionConfig.brotli() });CODE
CRITICAL…/vertx/tests/http/compression/HttpCompressionTest.java82 server = config.forServer().setCompression(new io.vertx.core.http.CompressionConfig().addCompressor(io.vertx.tests.hCODE
CRITICAL…test/java/io/vertx/tests/pool/SynchronizationTest.java126 Assume.assumeFalse(io.vertx.core.impl.Utils.isWindows());CODE
CRITICAL…test/java/io/vertx/tests/pool/SynchronizationTest.java223 int expected = io.netty.util.internal.InternalThreadLocalMap.lastVariableIndex();CODE
CRITICAL…test/java/io/vertx/tests/pool/SynchronizationTest.java235 assertEquals(expected, io.netty.util.internal.InternalThreadLocalMap.lastVariableIndex());CODE
CRITICAL…re/src/test/java/io/vertx/benchmarks/HeadersUtils.java26 public static final CharSequence VERTX_HEADER = io.vertx.core.http.HttpHeaders.createOptimized("vert.x");CODE
CRITICAL…re/src/test/java/io/vertx/benchmarks/HeadersUtils.java27 public static final CharSequence TEXT_PLAIN_HEADER = io.vertx.core.http.HttpHeaders.createOptimized("text/plain");CODE
CRITICAL…re/src/test/java/io/vertx/benchmarks/HeadersUtils.java28 public static final CharSequence CONTENT_LENGTH_HEADER = io.vertx.core.http.HttpHeaders.createOptimized("20");CODE
CRITICAL…re/src/test/java/io/vertx/benchmarks/HeadersUtils.java29 public static final CharSequence DATE_HEADER = io.vertx.core.http.HttpHeaders.createOptimized(DATE_FORMAT.format(new DCODE
CRITICAL…va/io/vertx/benchmarks/HttpServerHandlerBenchmark.java188 private static final CharSequence RESPONSE_TYPE_PLAIN = io.vertx.core.http.HttpHeaders.createOptimized("text/plain");CODE
CRITICAL…va/io/vertx/benchmarks/HttpServerHandlerBenchmark.java198 private static final CharSequence HELLO_WORLD_LENGTH = io.vertx.core.http.HttpHeaders.createOptimized("" + HELLO_WORLDCODE
CRITICAL…va/io/vertx/benchmarks/HttpServerHandlerBenchmark.java199 private static final CharSequence SERVER = io.vertx.core.http.HttpHeaders.createOptimized("vert.x");CODE
CRITICAL…va/io/vertx/benchmarks/HttpServerHandlerBenchmark.java200 private static final CharSequence DATE_STRING = io.vertx.core.http.HttpHeaders.createOptimized(java.time.format.DateTiCODE
CRITICAL…va/io/vertx/benchmarks/HttpServerHandlerBenchmark.java215 MultiMap headers = io.vertx.core.http.HttpHeaders.headers()CODE
CRITICAL…java/io/vertx/benchmarks/HeadersContainsBenchmark.java43 return nettySmallHeaders.contains(io.vertx.core.http.HttpHeaders.CONTENT_LENGTH.toString());CODE
CRITICAL…java/io/vertx/benchmarks/HeadersContainsBenchmark.java48 return nettySmallHeaders.contains(io.vertx.core.http.HttpHeaders.CLOSE.toString());CODE
CRITICAL…java/io/vertx/benchmarks/HeadersContainsBenchmark.java63 return vertxSmallHeaders.contains(io.vertx.core.http.HttpHeaders.CONTENT_LENGTH.toString());CODE
50 more matches not shown…
Over-Commented Block15 hits · 15 pts
SeverityFileLineSnippetContext
LOW…c/test/java/io/vertx/test/core/AssertExpectations.java21// public static <T> Expectation<T> assertThat(String reason, Matcher<? super T> matcher) {COMMENT
LOW…rc/test/java/io/vertx/test/core/AsyncTestBaseTest.java141// long start = System.currentTimeMillis();COMMENT
LOW…rtx-core/src/test/java/io/vertx/tests/net/NetTest.java1021 assertNullPointerException(() -> client.connect(80, null));COMMENT
LOW…st/java/io/vertx/tests/http/SupportedVersionsTest.java301// assertEquals(HttpVersion.HTTP_3, version);COMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3ClientTest.java261// Future<Void> fut = req.connection().shutdown();COMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3ClientTest.java441COMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3ClientTest.java461// .compose(request -> requestCOMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3ClientTest.java481//// filter(record -> record.getMessage().contains("DATA"))COMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3TestClient.java381//COMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3TestClient.java401// // Write the Header frame and send the FIN to mark the end of the request.COMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3ServerTest.java501 // @TestCOMMENT
LOW…st/java/io/vertx/tests/http/http3/Http3ServerTest.java521// assertEquals(7, factoryCOMMENT
LOW…java/io/vertx/core/net/impl/quic/QuicEndpointImpl.java261// public void close(Completable<Void> completion) {COMMENT
LOW…va/io/vertx/core/streams/impl/MessagePassingQueue.java121 protected final long lowWaterMark;COMMENT
LOW…tx-core/src/main/java/examples/ParseToolsExamples.java81COMMENT
Verbosity Indicators4 hits · 9 pts
SeverityFileLineSnippetContext
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java886 // Step 1: Acquire and establish a connectionCOMMENT
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java896 // Step 2: Queue a second waiter (pool is at capacity)COMMENT
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java908 // Step 3: Recycle the first lease - dispatches connection to the queued waiterCOMMENT
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java911 // Step 4: Cancel the waiter after recycle dispatched it - should return falseCOMMENT
Structural Annotation Overuse4 hits · 9 pts
SeverityFileLineSnippetContext
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java886 // Step 1: Acquire and establish a connectionCOMMENT
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java896 // Step 2: Queue a second waiter (pool is at capacity)COMMENT
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java908 // Step 3: Recycle the first lease - dispatches connection to the queued waiterCOMMENT
LOW…/test/java/io/vertx/tests/pool/ConnectionPoolTest.java911 // Step 4: Cancel the waiter after recycle dispatched it - should return falseCOMMENT
Fake / Example Data2 hits · 2 pts
SeverityFileLineSnippetContext
LOW…x-core/src/test/java/io/vertx/tests/http/HttpTest.java2784 String body = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore CODE
LOW…x-core/src/test/java/io/vertx/tests/http/HttpTest.java2784 String body = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore CODE
Hyper-Verbose Identifiers2 hits · 2 pts
SeverityFileLineSnippetContext
LOW…tx/core/http/impl/http1/Http1ServerRequestHandler.java33public class Http1ServerRequestHandler implements Handler<HttpServerRequest> {CODE
LOW…pl/http2/codec/Http2CodecClientChannelInitializer.java132 class UpgradeRequestHandler extends ChannelInboundHandlerAdapter {CODE
Slop Phrases1 hit · 2 pts
SeverityFileLineSnippetContext
LOW…ore/src/test/java/io/vertx/tests/ha/ComplexHATest.java80 // Don't forget to fail!COMMENT