Intellij - Error:java: invalid source release: 1.8

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Solution 1

  1. Install jdk1.8.*
  2. Change SDK to jdk1.8.*
  3. Done

Solution 2

Try to change java version at the terminal, try this: change-java 8

Solution 3

On IntelliJ:

  • Click on "File" menu
  • Click on "Settings" sub-menu.
  • On the Settings window, click to expand "Build, Execution, Deployment"
  • Expand "Build Tools"
  • Click on "Gradle"
  • On Gradle JVM, select the Java version you wish to use

IntelliJ Settings - Gradle Configuration Image

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Marsipan
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Marsipan

Software Engineering student at RIT, currently interning at Constant Contact working on Java applications.

Updated on June 04, 2022

Comments

  • Marsipan
    Marsipan almost 2 years

    While trying to run tests, I ran into this compilation error:

    invalid source release: 1.8

    I tried researching this on Google and here, and after applying all of the solutions that worked for others this issue still persists. Here is what I have done so far:

    • Preferences -> Java Compiler: set 'project bytecode version' to 1.8
      • I also set the target bytecode version to 1.8 for each individual module as well
    • Preferences -> Build, Execution, Deployment -> Build Tools -> Maven -> Runner: Set JRE to use Project JDK (which correctly displays as 1.8)
    • Project Structure -> Project: set Project SDK to 1.8 and language level to 8
    • Project Structure -> Modules -> Sources: set language level to 8 for each module
    • Project Structure -> Modules -> Dependencies: set Module SDK to 1.8

    I think this issue may have something to do with a discrepancy between the JDK and the compiler. When I run java -version from the terminal it returns 1.8.0_111. However when I run javac -version it returns 1.7.0_79. I looked for ways to force change the javac version to match the java version but nearly all of them reference update-alternatives which is not available for Mac OS or removing /usr/bin which is not allowed (even with sudo) on El Capitan.

    Workaround Edit:
    I was able to bypass the issue by going to Preferences -> Build, Execution, Deployment -> Compiler -> Java Compiler and changing the compiler from "javac" to "Eclipse" and I am able to compile my project.

  • mohit6up
    mohit6up about 7 years
    Thanks, this one worked for me after trying everything else suggested on SO and elsewhere.