Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/17#discussion_r57946105
--- Diff: extras/java8-tests/README.md ---
@@ -0,0 +1,24 @@
+# Java 8 Test Suites
+
+These tests require having Java 8 installed and are isolated from the main
Spark build.
+If Java 8 is not your system's default Java version, you will need to
point Spark's build
+to your Java location. The set-up depends a bit on the build system:
+
+* Sbt users can either set JAVA_HOME to the location of a Java 8 JDK or
explicitly pass
+ `-java-home` to the sbt launch script. If a Java 8 JDK is detected sbt
will automatically
+ include the Java 8 test project.
+
+ `$ JAVA_HOME=/opt/jdk1.8.0/ sbt/sbt clean "test-only
org.apache.spark.Java8APISuite"`
+
+* For Maven users,
+
+ Maven users can also refer to their Java 8 directory using JAVA_HOME.
However, Maven will not
+ automatically detect the presence of a Java 8 JDK, so a special build
profile `-Pjava8-tests`
--- End diff --
It looks like this actually _can_ be done because Maven profiles can be
activated automatically based on the JDK; see the JDK examples at
https://maven.apache.org/guides/introduction/introduction-to-profiles.html
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