Repo brief: chewiebug/GCViewer

Generated by RepoPilot · document generated 2026-09-16 · concise human review Evidence snapshot · analyzed 2026-09-16T22:13:08.478Z · commit 1a6bde833574

Verdict

Mixed — Slowing — last commit 5mo ago

• Last commit 5mo ago
• 13 active contributors
• CI configured
• Tests present

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests

What it is

GCViewer is a Java GUI and CLI tool that parses, visualizes, and analyzes verbose garbage collection logs from Oracle/Sun JDK 1.6+, IBM, HP, and BEA JVMs. It generates charts and summary reports from GC output to help developers identify memory leaks, optimize heap sizes, and understand GC pauses—supporting modern collectors like G1 and OpenJDK 9+ unified logging format. Single monolithic Maven JAR. Core is under src/main/java/com/tagtraum/perf/gcviewer/: GCViewer.java is the GUI entry point, ctrl/GCModelLoader.java orchestrates parsing, and format-specific parsers live in the imp/ package (e.g., DataReaderSun1_6_0.java). CLI argument parsing uses GCViewerArgsParser.java.…

Start here

Open these first:

• src/main/java/com/tagtraum/perf/gcviewer/GCViewer.java — Main entry point for the GUI application; every contributor must understand how the application initializes and how it…
• src/main/java/com/tagtraum/perf/gcviewer/imp/DataReaderFacade.java — Facade for reading GC logs from multiple JVM vendors; critical for understanding how logs are parsed and routed to…
• src/main/java/com/tagtraum/perf/gcviewer/imp/AbstractDataReaderSun.java — Base implementation for Sun/Oracle GC log readers; most modern JVM logs inherit from this, making it essential for parser…
• src/main/java/com/tagtraum/perf/gcviewer/ctrl/impl/GCModelLoaderImpl.java — Core loader that bridges parsed GC data into the in-memory model; essential for understanding data transformation pipeline.
• src/main/java/com/tagtraum/perf/gcviewer/ctrl/impl/GCViewerGuiController.java — Main GUI controller orchestrating UI interactions, file loading, and chart rendering; required for any UI or interaction…

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/chewiebug/GCViewer.git
cd GCViewer
mvn clean package
java -jar target/gcviewer-*.jar  # GUI
java -jar target/gcviewer-*.jar gc.log summary.csv chart.png  # CLI report

Daily commands:

GUI: java -jar gcviewer-1.37-SNAPSHOT.jar (double-click JAR or run command). CLI report: java -jar gcviewer-1.37-SNAPSHOT.jar gc.log summary.csv [chart.png] [-t PLAIN|CSV|CSV_TS|SIMPLE|SUMMARY]. **With rotat…

…shortened for this brief.

Key cautions & unknowns

• Slowing — last commit 5mo ago
• Concentrated ownership — top contributor handles 58% of recent commits
• GC format fragility: Parsers rely on exact log format matching (regex-based); minor JVM flag changes (-XX:+PrintGCDateStamps presence/absence) break parsing. Test your log format against the specific parser (e.g.,…
• License evidence is incomplete or ambiguous.
• Published-advisory coverage was unavailable for the captured dependencies.
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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