java: javacTask: source release 8 requires target release 1.8 (sbt project)

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Konstantinos Kougios
创建于

I have an sbt project:

name := "experiments"

scalaVersion := "2.10.4"

javacOptions ++= Seq("-source", "1.8","-target","1.8")

version := "1.0"


This imports ok and I can see in the java compiler settings , Project Bytecode level is 1.8 and additional compiler parameters are -source 1.8 -target 1.8

But still when I compile the project, I get this error:

java: javacTask: source release 8 requires target release 1.8 (sbt project)

Any ideas what might be wrong?

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Pavel Fatin
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Hi! Currently it's not always obvious how to determine intended JDK for an SBT project. While I'm unable to reproduce the problem, here's what you may check to resolve the error:

  • in Project Structure / Platform Settings / SDKs: JDK 1.8 is present, JDK home path really points to an existing JDK 8
  • in Project Structure / Project Settings / Project: Project SDK is JDK 1.8, Project language level is 8
  • in Project Structure / Project Settings / Modules: all modules inherit project SDK (Dependencies / Module SDK)
  • in Settings / Project Settings / Compiler / Java Compiler: Project bytecode version is either blank or 1.8, no per-module bytecode versions are configured


There was a similar report at StackOverflow (Maven-related, though), so you may also verify .idea/compiler.xml file ("target" attribute value).

Please tell us whether all that will help.

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