Java "lambda expressions not supported at this language level"

java intellij-idea lambda java-8
Czipperz picture Czipperz · Mar 28, 2014 · Viewed 177.7k times · Source

I was testing out some new features of Java 8 and copied the example into my IDE (Eclipse originally, then IntelliJ) as shown here

Eclipse offered no support whatsoever for lambda expressions, and IntelliJ kept reporting an error

Lambda expressions not supported at this language level

I would like to know if this is a problem with my install, the code, or support.

Answer

Abhilash Divakaran picture Abhilash Divakaran · Mar 28, 2014

In IntelliJ IDEA:

In File Menu → Project Structure → Project, change Project Language Level to 8.0 - Lambdas, type annotations etc.

For Android 3.0+ Go File → Project Structure → Module → app and In Properties Tab set Source Compatibility and Target Compatibility to 1.8 (Java 8)

Screenshot:

enter image description here

Related questions

Java Lambda method reference not working

My original code is this: private static void onClicked(MouseEvent event) { // code to execute } // somewhere else in the program: setOnMouseClicked(event -> SomeClass.onClicked(event)); But IntelliJ says "Can be replaced with method reference" which I'm not too sure …

Read More
Correct way to add external jars (lib/*.jar) to an IntelliJ IDEA project

When creating a new Java project in IntelliJ IDEA, the following directories and files are created: ./projectname.iml ./projectname.ipr ./projectname.iws ./src/ I want to configure IntelliJ IDEA to include my dependency JARs in ./lib/*.jar to the project. …

Read More
How to build jars from IntelliJ properly?

I have a project that contains a single module, and some dependencies. I'd like to create a jar, in a separate directory, that contains the compiled module. In addition, I'd like to have the dependencies present beside my module. No …

Read More