NoSuchElementException ☕ Java

java.util.NoSuchElementException: No value present

Code asked for an element that doesn’t exist — Optional.get() on empty, iterator.next() past the end, Scanner with no input.

Seen on: Java

Meaning

“No value present” comes from Optional.get()/orElseThrow() on an empty Optional. Iterators and Scanner throw it when exhausted.

Common causes

  • Optional.get() without checking
  • iterator.next() without hasNext()
  • Scanner reading beyond input

⚡ Quick fix

  1. Use orElse/orElseThrow with a clear exception
  2. Check hasNext()
  3. Validate input before reading

Detailed fix by platform

Java

  1. User u = repo.findById(id).orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND));

How to diagnose

  1. Source — Optional, iterator or Scanner?
  2. Data — Why is it empty?

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