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Compile error "Class file has wrong version 52.0, should be 50.0"

I'm trying to compile my project in IntelliJ IDEA. I'm using a class in an external JAR file and on compilation receiving the following error.

Class file has wrong version 52.0, should be 50.0

I understand that it's saying the JAR file was compiled with a newer Java version than that which IntelliJ is using. How do I make them compatible?

I have updated the Java on my Mac to 1.8 and when I run java -version or javac -version it confirms this.

What am I missing? (Apart from Java development experience)

Solution

  • Select "File" -> "Project Structure".

    Under "Project Settings" select "Project"

    From there you can select the "Project SDK".