Room (possibly others) dont seem to compile with Java 8

[RichyHBM]

I am getting this error specifically by trying to use kotlin with Room, but I assume this would also occur if you are using Java 8 in your source code.

The error is: Warning:warning: Supported source version 'RELEASE_7' from annotation processor 'android.arch.persistence.room.RoomProcessor' less than -source '1.8' and seems to be from a use of @SupportedSourceVersion which specifies "the latest source version an annotation processor supports"? Is this expected? Do we need to wait for the full 1.0 release for it to be fully supported?

[mynote]

Its a warning, not an error. If you use Java 8 features like Lambdas, its just prints a warning that rooms annotation processor uses java 7 for generating code. Ignore it since it is just a warning. I think room uses java 7 to let developers decide if they want to use java 8 (annotations) or 7 for now.

[yigit]

Yes, it is just a warning. Should not be a problem.

[kenyee]

Would be nice if there were a Gradle flag we could use to turn this warning off...it's the only warning in our project build :-(

[mttmllns]

Another vote for patching this up somehow. It's the only thing keeping us from treating warnings as errors.

[ezamelczyk]

Just pass -Xlint:unchecked to your Gradle flags until Google decides to support Java 8 like in lifecycle library.

[aldoKelvianto]

If somebody still encounter this warning, I suggest use common-java8 instead of compiler.

-    annotationProcessor "android.arch.lifecycle:compiler:1.0.0"
+    implementation "android.arch.lifecycle:common-java8:1.0.0"

In my project the warning disappear. I hope this helps.

[mtrewartha]

That gets rid of the warning for the lifecycle stuff, but not for the Room stuff.

[mibrahimdev]

I have the same problem but I don't know how to solve I'm using Android studio 3.10

[SerggioC]

So many bugs...

[successanil]

upgrade to room 1.1.1, java 8 and warning will disappear.

[shekharartemedia]

i have update the room version but still i getting the same issue. Please help.

[vinisantos630]

Boa noite pessoal, estou com o mesmo problema só que em Java, para gerar relatórios no JasperReport Studio, segue abaixo a mensagem:

net.sf.jasperreports.engine.design.JRJdk13Compiler compileClasses INFORMAÇÕES: warning: Supported source version 'RELEASE_8' from annotation processor 'net.sf.jasperreports.annotations.processors.properties.PropertyProcessor' less than -source '17' 1 warning

Entendi que é um aviso, mas o executável não deixa gerar o relatório por conta desse "erro", alguém conseguiu uma solução?

[sebm123]

I am getting this error specifically by trying to use kotlin with Room, but I assume this would also occur if you are using Java 8 in your source code.

The error is: Warning:warning: Supported source version 'RELEASE_7' from annotation processor 'android.arch.persistence.room.RoomProcessor' less than -source '1.8' and seems to be from a use of @SupportedSourceVersion which specifies "the latest source version an annotation processor supports"? Is this expected? Do we need to wait for the full 1.0 release for it to be fully supported?

[sebm123]

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[thewyp]

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