Aliaksei Zhynhiarouski opened SPR-15246 and commented

It looks like new PathPatternParser, that introduced for path matching in recent updates works in not thread safe manner. If there are a lot of clients try to achieve URL, they all will fail due java.lang.IndexOutOfBoundsException caused by PathPatternParser:127

Steps to reproduce:

1. Checkout project
   https://github.com/aliaksei-lithium/microservices-framework-benchmark/tree/feature/reactor-improve/spring-boot-reactor
   (feature/reactor-improve branch and spring-boot-reactor folder)
2. Start server and run wrk -t4 -c128 -d2s http://localhost:8080 to simulate the highload to the endpoint
3. Observe the error (java.lang.IndexOutOfBoundsException) in logs.
4. Other requests will fail also.

Connected with #19112

Issue Links:

• HTTP request pattern matching refinements [SPR-14544] #19112 HTTP request pattern matching refinements

Referenced from: commits babd551, 2ac08af