This post shows how to change Java Language Level in IntelliJ IDEA.

Requirements

Stuff used in this post.

• IntelliJ IDEA Ultimate 2016.3
• Java 8
• Windows 10 Enterprise

Wrong Language Level Example

Consider the following screenshot. On line 26, the IDE provides a clue as to why forEach is not supported. The maven project is initially in Language Level 1.7 .

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Change Language Level

To change the Language Level to 8,

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1. Right-click on the project comturretarxjava and choose Open Module Settings
2. Choose the correct minimum Language Level  that supports Lambda expressions
3. Click OK

Issue Fixed

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