Java Error vs Exception: Key Differences Every Developer Must Know
Error is an irrecoverable condition that crashes the JVM—think of it as a hardware or system failure you can’t catch. Exception is a recoverable event you can anticipate and handle in code.
Because both surface as red text in the console, many devs lump them together. Managers often hear “error” and panic, so developers casually say “exception” to sound less alarming—even when it’s actually an Error.
Key Differences
Errors descend from java.lang.Error, are unchecked, and signal serious problems like OutOfMemoryError. Exceptions descend from java.lang.Exception, come in checked and unchecked flavors, and allow graceful recovery via try-catch.
Which One Should You Choose?
Never try to handle an Error; instead, fix the underlying issue. For an Exception, decide: catch it if you can recover, or let it bubble up if recovery is impossible.
Examples and Daily Life
StackOverflowError while parsing a giant JSON file? That’s an Error—restart the service. FileNotFoundException when a config file is missing? Catch it, log it, and fall back to defaults.
Can I catch an Error in Java?
Technically yes, but you shouldn’t; the JVM is already in an unstable state.
Is NullPointerException an Error or an Exception?
It’s a RuntimeException, so you can catch and handle it gracefully.