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I use IntelliJ IDEA as my development environment, and Maven for dependency management. I frequently build my project structure (directories, poms, etc) outside of IDEA and then import the project into IDEA using Import project from external model. This works great, except that in my poms I specify that the maven-compiler-plugin should use JDK 1.6, and when I import, IDEA informs me that the Language Level Changed and that Language level changes will take effect on project reload, and then prompts to reload the project. This is annoying because I always use the same JDK version.

How do I change the default JDK that IntelliJ IDEA uses, so that I don't have to reload my project every time I import a new project?

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This setting is changed in the "Default Project Structure..." dialog. Navigate to "File" -> "Other Settings" -> "Default Project Structure...".

Select Default Project Structure

Next, modify the "Project language level" setting to your desired language level.

Setting the project language level

IntelliJ IDEA 12 had this setting in "Template Project Structure..." instead of "Default Project Structure..."

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