TENTACLES-12: Change default JDK / guess
diff --git a/Jenkinsfile b/Jenkinsfile
index 1121eb0..049f3a1 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -40,7 +40,7 @@
 
     tools {
         maven 'maven_3_latest'
-        jdk 'jdk_1.8_latest'
+        jdk 'jdk_1.9_latest'
     }
 
     options {