IntelliJ IDEA 13 uses Java 1.5 despite setting to 1.7

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Please check your project/module language levels (Project Structure | Project; Project Structure | Modules | module-name | Sources). You might also want to take a look at Settings | Compiler | Java Compiler | Per-module bytecode version.

Set also this:

File -> Project Structure -> Modules :: Sources (next to Paths and Dependencies) and that has a “Language level” option which also needs to be set correctly.

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