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

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

When encountering the error "IDEA: javac: source release 1.7 requires target release 1.7" while running JUnit tests in IntelliJ IDEA, it typically indicates a mismatch between the source and target versions of your Java.

Troubleshooting Steps:

1. Verify IDE Configuration:

   • Ensure that you're using Java SDK 1.7.
   • Check the Module language level in IntelliJ IDEA. It should be set to 1.7.

2. Inspect Maven Compiler Options:

   • Go to "Settings | Build, Execution, Deployment | Compiler."
   • Check if incorrect compiler options are imported from Maven. Correct these if necessary.

3. Target and Source Version Settings:

   • Verify the bytecode (target) version settings for your project and module.
   • Adjust these settings to be compatible with the required versions.

4. Other Source Language Level Configuration:

   • Examine your project settings "Project Structure | Project."
   • Check the "Project | Language Level" setting.
   • Explore your module settings "Project Structure | Modules | Sources."
   • Verify the "Sources | Language Level" parameter.

5. Maven Configuration:

   • Review your pom.xml file.
   • Change the language level using the maven-compiler-plugin configuration.
   • Alternatively, set the properties "maven.compiler.source" and "maven.compiler.target" to the desired versions.
   • Reimport the Maven project in IntelliJ IDEA to apply these changes.

By following these steps, you can correct the "IDEA: javac: source release 1.7 requires target release 1.7" error and successfully compile and run your JUnit tests.

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