How to change project language level for all project in Intellij

Question

I am using Intellij. It is good, but when I create a new project or import a project the default project language level set to 6 (@override in interfaces). But I want to set it 8 (Lambdas, type annotations etc). How can I do that? I have tried change the settings in "Other Settings" -> "Default Project Structure" and the set the project language level to 8, but no luck. Please someone help me. I have added a screen shoot.

• I am using Intellij 14.0.2

Answer 1

File -> Other Settings -> Default Project Structure...

You can change it in there.

(Edit: It's now called "Structure for New Projects")

Answer 2

If it is a maven project, make sure that the following is set.

For example, if you want to use the Java 8 language features (-source 1.8) and also want the compiled classes to be compatible with JVM 1.8 (-target 1.8), you can either add the two following properties, which are the default property names for the plugin parameters:

<project>   [...]   <properties>     <maven.compiler.source>1.8</maven.compiler.source>     <maven.compiler.target>1.8</maven.compiler.target>   </properties>   [...] </project> 

For more details check this