diff -r 41df50e7303d -r 228abfa87080 langtools/make/build.properties
--- a/langtools/make/build.properties	Wed Jul 05 20:04:46 2017 +0200
+++ b/langtools/make/build.properties	Tue Oct 21 09:01:51 2014 -0400
@@ -32,8 +32,8 @@
 # boot.java.home = /opt/jdk/1.7.0
 boot.java = ${boot.java.home}/bin/java
 boot.javac = ${boot.java.home}/bin/javac
-boot.javac.source = 7
-boot.javac.target = 7
+boot.javac.source = 8
+boot.javac.target = 8
 
 # This is the JDK used to run the product version of the tools,
 # for example, for testing. If you're building a complete JDK, specify that.