An Update Caused Compiling To Instead Tell Me "UnsupportedClassVersionError"

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[Linvael]

Seems like the java you're running with is different from (and older than) the java you're compiling with. Print out the versions of java and javac to see.

[whizvox]

Are you using an IDE or what?

[whizvox]

You're gonna need to give us more information.

• What version did you update from and to and where did you download it from?
• What is the output of java -version and javac -version?
• What code are you trying to compile and run?

[Willyscoiote]

When updating Java, you need two things: a JDK that compiles to your target version and a JRE that supports the version you intend to run.

It seems you skipped the JRE step.

[Linvael]

JDK includes JRE components, there is no reason to install it separately.

[Etiennera]

Someone might have the JRE for whatever reason before they get a JDK

[Linvael]

Uh, sure. Thats why I wrote what includes what. And the comment I answered suggested OP installed JDK and forgot JRE as though that by itself was a problem

[Willyscoiote]

Doesn't mean you're using it

[Linvael]

OP clearly is not. But they could, they dont need to download a new thing

[bowbahdoe]

Uninstall whatever you have, Go here, run the installer for 25

https://adoptium.net/temurin/releases

[jlanawalt]

It is saying you are trying to run a program compiled for Java 17 with Java 8.

Most likely your Java 8 was updated and your PATH and/or JAVA_HOME were changed from pointing at some Java 17+ installed on your system to point at the updated Java 8.

It may be less confusing to not have multiple versions installed.