☕ Java errors

Java and JVM exceptions: NullPointerException, ClassNotFoundException, OutOfMemoryError.

Code	Error	What it means
ClassNotFoundException	java.lang.ClassNotFoundException / NoClassDefFoundError	The JVM couldn’t find a class on the classpath at runtime.
NullPointerException	java.lang.NullPointerException	Code called a method or accessed a field on a reference that is `null`.
OutOfMemoryError	java.lang.OutOfMemoryError: Java heap space	The JVM ran out of heap memory and garbage collection couldn’t free enough.
ConcurrentModificationException	java.util.ConcurrentModificationException	A collection was modified while being iterated (even in a single thread).