Remove duplicate LICENSE and NOTICE files from benchmark JARs

Open Beginner friendly

#3,695 opened on Jul 29, 2026 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 72/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Active
Tech stack: java
Domain: build-system

Research direction

Inspect the shade configuration in the parquet-benchmarks and parquet-plugins/parquet-plugins-benchmarks modules. Run ./mvnw --batch-mode -Pvector-plugins -DskipTests clean package, then inspect the final benchmark JARs with the provided checks. Done means each final JAR contains exactly one META-INF/LICENSE and one META-INF/NOTICE while retaining required attribution.

Written by the indexing model from the issue text.

Description

These local JMH artifacts are not published, so releases are unaffected. Update their shade configuration to retain only the intended META-INF/LICENSE and META-INF/NOTICE, while preserving required attribution in those canonical files.

The shaded benchmark uber-JARs contain multiple LICENSE/NOTICE variants:

parquet-benchmarks.jar
parquet-plugins-benchmarks.jar

Reproduction

# Build all default and vector-plugin JARs without running tests.
./mvnw --batch-mode -Pvector-plugins -DskipTests clean package

# Check all final JARs; exclude only Maven Shade backup artifacts.
(
  failed=0
  while IFS= read -r -d '' jar; do
    licenses=$(jar tf "$jar" | grep -Eic '(^|/)LICENSE([._-].*)?$' || true)
    notices=$(jar tf "$jar" | grep -Eic '(^|/)NOTICE([._-].*)?$' || true)

    if [ "$licenses" -eq 1 ] && [ "$notices" -eq 1 ]; then
      echo "PASS: $jar"
    else
      echo "FAIL: $jar (LICENSE=$licenses, NOTICE=$notices)"
      jar tf "$jar" | grep -Ei '(^|/)(LICENSE|NOTICE)([._-].*)?$'
      failed=1
    fi
  done < <(
    # original-* JARs are temporary backups created by Maven Shade.
    find . -type f -path '*/target/*.jar' \
      ! -name 'original-*.jar' \
      -print0 | sort -z
  )
  exit "$failed"
)

Observed failures:

FAIL: ./parquet-benchmarks/target/parquet-benchmarks.jar (LICENSE=9, NOTICE=4)
FAIL: ./parquet-plugins/parquet-plugins-benchmarks/target/parquet-plugins-benchmarks.jar (LICENSE=4, NOTICE=3)

Expected: every final JAR contains exactly one LICENSE and one NOTICE file under META-INF/.

Dominant language: Java
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