Java Code Common Problems
2 min readMay 5, 2024
- NullPointerException (NPE): This is one of the most common runtime exceptions in Java. It occurs when you try to access or invoke methods on an object reference that is null.
2. ConcurrentModificationException: This exception is thrown when you try to modify a collection (like ArrayList, HashMap, etc.) while iterating over it using an iterator, without using the iterator’s own methods to modify it.