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

IDEA: Error "javac: source release 1.7 requires target release 1.7"

When executing JUnit tests in IntelliJ IDEA, developers may encounter the error message "javac: source release 1.7 requires target release 1.7". This issue stems from a discrepancy between the source and target language levels configured in the project.

Resolving the Error

To rectify this issue, it is crucial to ensure that both the source and target language levels are correctly set to 1.7. This can be adjusted in several locations within IDEA:

• Project Structure | Project: Verify that the "Project language level" is set to 1.7.
• Project Structure | Modules: Check each module's "Source" tab and ensure the "Language level" is 1.7.
• Compiler Options (Project Settings): Ensure that the "Source version" and "Target version" are set to 1.7.

Additionally, Maven projects may have their own language level settings. Check the pom.xml file for the following configurations:

• 1.8
• 1.8

If these settings are present, ensure they are changed to 1.7. Maven will automatically adjust the project settings after the project is reimported into IDEA.

By aligning both the source and target language levels within IDEA and addressing potential Maven configuration, this error can be effectively resolved.

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