(MODULES-1570) Add java_major_version fact

Gives the major version of the Java release (ie. Java 1.7.0_71, major version is 7)

We also want to specifically return nil when java not present

lib/facter/java_major_version.rb

@@ -0,0 +1,20 @@
+# Fact: java_major_version
+#
+# Purpose: get Java's major version
+#
+# Resolution:
+#   Tests for presence of java, returns nil if not present
+#   returns output of "java -version" and splits on \n + '"'
+#   eg.
+#
+# Caveats:
+#   none
+#
+# Notes:
+#   None
+Facter.add(:java_major_version) do
+  setcode do
+    java_version = Facter.value(:java_version)
+    java_patch_level = java_version.strip.split('_')[0].split('.')[1] unless java_version.nil?
+  end
+end

lib/facter/java_patch_level.rb

@@ -13,10 +13,6 @@
 Facter.add(:java_patch_level) do
   setcode do
     java_version = Facter.value(:java_version)
-    if java_version.nil?
-      "JAVA_NOT_INSTALLED"
-    else
-      java_patch_level = java_version.strip.split('_')[1]
-    end
+    java_patch_level = java_version.strip.split('_')[1] unless java_version.nil?
   end
 end

lib/facter/java_version.rb

@@ -1,6 +1,6 @@
 # Fact: java_version
 #
-# Purpose: store java versions in the config DB
+# Purpose: get full java version string
 #
 # Resolution:
 #   Tests for presence of java, returns nil if not present
@@ -11,9 +11,10 @@
 #
 # Notes:
 #   None
-Facter.add(:java_version) do
-  setcode do
-    java_version = Facter::Util::Resolution.exec("java -version 2>&1")
-    java_version = java_version.to_s.lines.first.strip.split(/version/)[1].gsub(/"/, "").strip
+if Facter::Util::Resolution.which('java')
+  Facter.add(:java_version) do
+    setcode do
+      Facter::Util::Resolution.exec('java -version 2>&1').lines.first.split(/"/)[1].strip
+    end
   end
-end
+end