How to Fix 'javac: source release 1.7 requires target release 1.7' in IntelliJ IDEA?

IDEA: javac: source release 1.7 requires target release 1.7

When running a JUnit test in IntelliJ IDEA, users may encounter the error "javac: source release 1.7 requires target release 1.7." To address this issue, it is crucial to inspect and adjust the following settings:

1. Compiler Options

Verify the compiler options specified in IDEA. The issue could arise from incorrect options imported from Maven. Check under "Build, Execution, Deployment" > "Compiler" for incorrect settings.

2. Bytecode Version

Ensure the project and module bytecode (target) versions are set to 1.7 or higher. These settings can be found in "Project Structure" > "Project" and "Project Structure" > "Modules," respectively.

3. Other Source Language Level Settings

• Project Structure | Project: This setting affects the entire project.
• Project Structure | Modules | Sources: This setting applies to individual modules.

4. Maven Plugin Configuration

If the issue persists despite the above adjustments, check the Maven build configuration in pom.xml. The default language level in Maven is 1.5, but it can be overridden by specifying the following settings:

5. Maven Reimport

After modifying any Maven configuration, it is essential to "Reimport" the project in the "Maven Projects" tool window. This action ensures that IDEA aligns with the updated settings.

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