Error:Java: Invalid Source Release: 8 in Intellij. What Does It Mean

Error:java: invalid source release: 8 in Intellij. What does it mean?

I had the same issue when "downgrading" a project from Java 8 to Java 6. The reason was that it was not changed at all places in IntelliJ.

In IntelliJ 13.1.4 I had to change Java and SDK version on the following places not to get this error:

• File -> Project Structure -> Project Settings
• File ->
  Project Structure -> Module Settings -> Tab: Sources: Language Level
• File -> Project
  Structure -> Module Settings -> Tab: Dependencies: Module SDK
• File -> Settings -> Compiler -> Java Compiler -> Target bytecode
  version

The last bullet was the one that was not updated in my case. Once I changed this, the error disappeared.

intellij idea - Error: java: invalid source release 1.9

Select the project, then File > ProjectStructure > ProjectSettings > Modules -> sources
You probably have the Language Level set at 9:

Just change it to 8 (or whatever you need) and you're set to go.

Also, check the same Language Level settings mentioned above, under Project Settings > Project

IntelliJ - Invalid source release: 17

In intellij just set Gradle JVM to Java version 17.

"File -> Settings.. -> Build, Execution, Deployment -> Build Tools -> Gradle"
there select your project and set Gradle JVM to your java 17.0.1

Error: Java: invalid target release: 11 - IntelliJ IDEA

I've got the same issue as stated by Gryu.
Same Intellij 2018 3.3

I was able to start my project by setting (like stated by Grigoriy)

File->Project Structure->Modules ->> Language level to 8 ( my maven project was set to 1.8 java)

AND

File -> Settings -> Build, Execution, Deployment -> Compiler -> Java Compiler -> 8 also there

I hope it would be useful

Error:java: error: invalid source release: 13 using JDK12 with IntelliJ

The right way™

The earliest version of IntelliJ that supports switch expressions is version 2019.1, which was released on March 27, 2019. You can get it here: https://www.jetbrains.com/idea/download . You also need JDK 12 of course, and set that as your project SDK.

Then you can set the language level to:

12 (Preview) - Switch expressions

With that, everything should work.

If it doesn't, you might want to check that You've;

• set the project language level, as well as the module language level to the "12 (Preview)"
• set the execution JRE in the run configuration of your application to 12 (or the default, which is the project SDK).
• set the right bytecode version in Settings -> 'Build, Execution, Deployment'/Compiler/Java Compiler. (Leave this fields empty to match the language level)

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Manually configure --enable-preview (no intellisense)

Turning my comment into an answer. You can add the --enable-preview flag to the VM by going to:

Run -> Edit Configurations...

Then selecting your main class from the tree menu on the left, and pasting --enable-preview in the "VM options" box

You can do the same for the compiler by going to:

File -> Settings...

Then in the tree menu under Build, Execution, Deployment -> Compiler -> Java Compiler you can put --enable-preview in the "Additional command line parameters" box:

Note that intellisense still might not work after doing that. I'm still seeing red squiggly lines under the ->s with the error message "unexpected token". But, when I click the run button the class compiles and runs just fine.

IntelliJ 2021.2.2 gives error 'java: error: invalid source release: 18' when compiling program

.idea/misc.xml has incorrect language level specified for some reason (JDK_X):

<component name="ProjectRootManager" version="2" languageLevel="JDK_X" default="true" project-jdk-name="16" project-jdk-type="JavaSDK">

Close the project, change languageLevel to 16 and see if it helps.

There was a related bug reported, but it should be fixed in IntelliJ IDEA 2020.2 and later versions. Probably a regression.

Java 11 : Error:java: invalid source release: 11 - Not sure what to do anymore

Please check your JDK 11 Setup in IntelliJ! Even though the project SDK is called 11, it still says that your java-version is 1.8.161. Judging from this it looks like your new jdk 11 still points to your old 1.8 installation which does not now about version 11 yet.

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