Summary

Add missing validation to java.lang.runtime.ObjectMethods::bootstrap for its getters argument.

Problem

bootstrap specifies if any argument is invalid or inconsistent, it throws IllegalArgumentException. However, when a method handle in getters misbehave in one of the three ways:

1. Returns void
2. Not exactly one receiver argument
3. Receiver argument is not of the recordClass type

This method proceeds without initial checks and throws generic exceptions from method handle infrastructures later, making the exceptions confusing.

Solution

Add checks for these 3 conditions so such getter method handles are rejected early on with an IllegalArgumentException.

Specification

None. This is purely a behavioral change.