Which version of Java does SBT use?

Question

You can use eval at the sbt prompt with the appropriate system properties:

> eval System.getProperty("java.version")
[info] ans: String = 1.7.0_45
> eval System.getProperty("java.home")
[info] ans: String = /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre

(The other answers are fine too, this is just another method.)

Just run sbt console and you'll get something like this:

Welcome to Scala version 2.10.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_45). Type in expressions to have them evaluated. Type :help for more information.

Which shows you the version of Java being used.

Cheers

JC

It's actually easy.

Find the command line of SBT (cat `which sbt`) and see which Java it is.

For example, my SBT command line begins with:

/usr/bin/java -Xmx512M

And /usr/bin/java -version tells the Java version, in my case it is 1.7.

sbt -v is another way:

# sbt -v
[process_args] java_version = '1.7.0_121'
# Executing command line:
java
-Xms1024m
-Xmx1024m
-XX:ReservedCodeCacheSize=128m
-XX:MaxPermSize=256m
-jar
/usr/share/sbt-launcher-packaging/bin/sbt-launch.jar

[info] Loading project definition from /root/.sbt/0.13/staging/a6d8e5030b69785a9763/build/project
[info] Set current project to xx (in build file:/build/)
>