Why Does My JUnit Test Fail with 'javac: source release 1.7 requires target release 1.7' in IntelliJ IDEA?

IDEA: Source Release 1.7 Requires Target Release 1.7

When executing a JUnit test in IntelliJ IDEA, you might encounter the following error: "javac: source release 1.7 requires target release 1.7." This issue stems from mismatched source and target release configurations.

To address this error, ensure that the following settings are correctly configured:

Compiler Options:

Verify that the compiler options imported from Maven are correct:

• Target version should match the source version (e.g., 1.7)

Project and Module Settings:

• Project Structure | Project: Set the Project language level to 1.7
• Project Structure | Modules: Check each module's Sources tab and ensure the language level is 1.7

Maven Settings:

• In pom.xml, configure the maven-compiler-plugin to set the source and target versions to 1.8 or higher.
• Alternatively, specify the source and target versions as Maven properties.

IntelliJ IDEA Specific:

Once the above configurations are set, reimport the Maven project in IntelliJ IDEA to ensure that it respects the updated settings.

Additional Sources for Language Level Configuration:

• Project Structure | Sources
• pom.xml (maven-compiler-plugin configuration or Maven properties)

Default Maven Language Level:

Note that Maven's default language level is 1.5 (5.0). IntelliJ IDEA will initially set the module language level to this value.

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