Build: Set default Java version for jenv users (#3651)

Project requires Java 8 for full build. Certain modules are not getting compiled when Gradle is run with JDK 11. For example, in jmh.gradle there currently is: if (jdkVersion == '8' && sparkVersions.contains("2.4")) { jmhProjects.add(project(":iceberg-spark:iceberg-spark2")) } Provide explicit default configuration for those using `jenv` to manage multiple JDKs, to help contributors build the project.
linkedin · Dec 2, 2021 · ec9a86b · ec9a86b
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diff --git a/.java-version b/.java-version
@@ -0,0 +1 @@
+1.8
diff --git a/dev/.rat-excludes b/dev/.rat-excludes
@@ -1,6 +1,7 @@
 version.txt
 versions.lock
 versions.props
+.java-version
 books.json
 new-books.json
 build