This project provides focused JMH benchmarks to test Spring Framework property resolution performance between versions 6.1 and 6.2, specifically designed to reproduce performance regressions in property placeholder resolution.

property-resolution-benchmark/
├── pom.xml                                    # Maven configuration with Spring 6.1/6.2 profiles
├── run-benchmarks.sh                         # Automated benchmark execution script
├── README.md                                 # This file
└── src/main/java/perf/spring/benchmark/
    └── SpringPropertyResolutionBenchmark.java    # Property resolution benchmarks

• Java 17+
• Maven 3.6+

./run-benchmarks.sh

./run-benchmarks.sh 5000   # 5K properties
./run-benchmarks.sh 20000  # 20K properties
./run-benchmarks.sh 50000  # 50K properties

# Test Spring 6.1
mvn clean package -Pspring-6.1
java -jar target/property-resolution-benchmark.jar -p propertyCount=10000

# Test Spring 6.2
mvn clean package -Pspring-6.2
java -jar target/property-resolution-benchmark.jar -p propertyCount=10000

• Simple Property Resolution: Basic property value retrieval
• Nested Property Resolution: Properties with placeholder references
• Complex Property Resolution: Multi-level nested properties
• Property Placeholder Helper: Direct placeholder resolution using Spring's PropertyPlaceholderHelper
• Batch Property Resolution: Multiple property resolution in sequence

The propertyCount parameter controls the number of properties used in benchmarks:

• Default: 10,000 properties
• Range: 5,000 - 50,000 properties
• Configurable via command line or script parameter

• Heap: 2GB - 4GB
• Forks: 3 (for statistical significance)
• Warmup: 3 iterations, 2 seconds each
• Measurement: 5 iterations, 3 seconds each

Benchmark results are saved to:

• benchmark-results/results-spring-6.1-{propertyCount}properties.txt
• benchmark-results/results-spring-6.2-{propertyCount}properties.txt
• benchmark-results/jmh-spring-6.1-{propertyCount}properties.json
• benchmark-results/jmh-spring-6.2-{propertyCount}properties.json
• benchmark-results/performance-comparison-{propertyCount}properties.txt

This benchmark suite is specifically designed to identify performance regressions in Spring Framework 6.2 property resolution, particularly:

1. Property Placeholder Resolution: Tests the new PlaceholderParser implementation
2. Nested Property Resolution: Measures performance with complex property dependencies
3. Circular Property Resolution: Tests circular reference handling
4. Batch Property Resolution: Measures performance with multiple property lookups

This project can be used as a reproducer for Spring Framework property resolution performance regression bug reports by:

1. Running benchmarks with both Spring 6.1 and 6.2
2. Comparing results to identify regressions
3. Providing detailed performance metrics and JVM settings
4. Demonstrating the impact on different property counts and scenarios