Submitting this for John Engebretson, who would be dealing with this issue.

Class.getMethod() w/ no args is slow and commonly used. Dirty, broken, sensitivity-testing patch (attached as 8343559-jdk17.patch) makes it about 50% faster when the method is on the target class, and about 75% faster when the method is on a superclass. It likely requires more work to fit the most-specific method selection cleanly.

Real-life impact: Spring proxies and Tomcat's expression handling often lookup zero-arg methods... for example hashcode(), toString(), getProperty1(), when not otherwise treated as a bean.

Benchmark Mode Cnt Score Error Units

# Base:
GetMethodBenchmark.getHashMapToString avgt 4 363.709 ± 35.071 ns/op
GetMethodBenchmark.getObjectToString avgt 4 60.053 ± 1.188 ns/op

# Patched:
GetMethodBenchmark.getHashMapToString avgt 4 96.858 ± 4.919 ns/op
GetMethodBenchmark.getObjectToString avgt 4 36.941 ± 0.476 ns/op