Hi,
I found that this sql will throw error: Invalid path: 'io.github.zhengyhn.practice.hibernate.ABStatus.A'.

select s from Sample s where s.upperStatus = io.github.zhengyhn.practice.hibernate.ABStatus.A

But the below sql works.

select s from Sample s where s.lowerStatus = io.github.zhengyhn.practice.hibernate.BaStatus.A

I read the code and found this is because of these lines of code in org.hibernate.internal.util.ReflectHelper.

if ( conventionalJavaConstants &&
				!JAVA_CONSTANT_PATTERN.matcher( name ).find() ) {
	return null;
}

And the JAVA_CONSTANT_PATTERN is as below.

private static final Pattern JAVA_CONSTANT_PATTERN = Pattern.compile(
			"[a-z\\d]+\\.([A-Z]{1}[a-z\\d]+)+\\$?([A-Z]{1}[a-z\\d]+)*\\.[A-Z_\\$]+", Pattern.UNICODE_CHARACTER_CLASS);

This pattern indicate that the constant name must begin with an upper case alphabet. So "ABStatus" cannot be recognized as valid constant name.

However, in my real-world project, we use GSStatus as the enum class name. I have to change it to GsStatus currently.

I suggest changing this pattern to "[a-z\\d]\\.([A-Z][a-z\\d])
$?([A-Z]

[a-z\\d])*
.[A-Z_\\$]".

I have written a simple project for finding this issue. You can refer it as reference. https://github.com/zhengyhn/java-practice/tree/master/hibernate-enum