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

Question

I am trying to build an application which was built using java 8, now it's upgraded to java 11. I installed Java 11 using an oracle article in my windows machine and I use IntelliJ IDEA 2017 as my IDE.

I changed my system environment variables and set the

JAVA_HOME to C:\Program Files\Java\jdk-11.0.1

And added that to the Path variable.

C:\>java -version
java version "11.0.1" 2018-10-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.1+13-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.1+13-LTS, mixed mode) 

When I build my application in IntelliJ, this is what I get:

Information:java: Errors occurred while compiling module 'test-domain_main'
Information: javac 1.8.0_171 was used to compile java sources
Information:1/10/2019 4:21 PM - Compilation completed with 1 error and 0 warnings in 1s 199ms
Error:java: invalid target release: 11

This is what I've tried so far:

1. I changed .idea/compiler.xml target values from 8 to 11 but that didn't help. Also, verified the Target bytecode version in settings > Build, Execution, Deployment > Compiler > Java Compiler and all my modules are set to 11.

2. Went to file > Project Structure > SDKs *(currently I have 1.7 and 1.7 listed)* > Add new SDK > JDK > After that, I selected C:\Program Files\Java\jdk-11.0.1 But it errors out with "The selected directory is not a valid home for JDK"

I am not sure if I installed the wrong JDK 11, because in my C:\Program Files\Java\, I see separate JDK and JRE folders for 1.7 and 1.8 but only JDK folder for 11.0.1

Or is it something else I need to change?

Answer 1

I've got the same issue as stated by Grigoriy Yuschenko. 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