java.lang.IllegalArgumentException
A method rejected an argument value as invalid.
Exact message you may see
No enum constant
Seen on:
Java
Meaning
It’s a generic exception thrown by libraries and your own validation. The message (and the method in the stack trace) tells you which argument and why.
Common causes
- Invalid enum name in Enum.valueOf
- Null/empty values where not allowed
- Out-of-range numbers
- Spring: missing -parameters flag for @PathVariable names
⚡ Quick fix
- Read the message and the method that threw it
- Validate inputs before calling
- Use Enum lookups that handle unknown values
Detailed fix by platform
Java
- Spring Boot 3.2+: compile with
-parameters(Maven compiler plugin parameters=true) or name @RequestParam/@PathVariable explicitly
How to diagnose
- Method — Which method threw it?
- Value — Which argument value?
🔧 Still not fixed?
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Where this error sits
Origin: Application & API. Errors that are often confused with or caused by this one (click to open):
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Last updated 13 Oct 2026