add two facts: java_libjvm_path java_default_home

* dirname containing base directory of java
* e.g. java binary is `${::java_default_home}/jre/bin/java`

* dirname containing `libjvm.so`
* Most people will use this for LD_LIBRARY_PATH

spec/unit/facter/java_default_home_spec.rb

@@ -0,0 +1,29 @@
+require "spec_helper"
+
+describe Facter::Util::Fact do
+  before {
+    Facter.clear
+    Facter.fact(:kernel).stubs(:value).returns('Linux')
+  }
+
+  describe "java_default_home" do
+    context 'returns java home path when readlink present' do
+      it do
+        java_path_output = <<-EOS
+/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
+        EOS
+        Facter::Util::Resolution.expects(:which).with("readlink").returns(true)
+        Facter::Util::Resolution.expects(:exec).with("readlink -e /usr/bin/java").returns(java_path_output)
+        Facter.value(:java_default_home).should == "/usr/lib/jvm/java-7-openjdk-amd64"
+      end
+    end
+
+    context 'returns nil when readlink not present' do
+      it do
+        Facter::Util::Resolution.stubs(:exec)
+        Facter::Util::Resolution.expects(:which).with("readlink").at_least(1).returns(false)
+        Facter.value(:java_default_home).should be_nil
+      end
+    end
+  end
+end

spec/unit/facter/java_libjvm_path_spec.rb

@@ -0,0 +1,21 @@
+require "spec_helper"
+
+describe Facter::Util::Fact do
+  before {
+    Facter.clear
+    Facter.fact(:kernel).stubs(:value).returns('Linux')
+    java_default_home = '/usr/lib/jvm/java-8-openjdk-amd64'
+    Facter.fact(:java_default_home).stubs(:value).returns(java_default_home)
+    Dir.stubs(:glob).with("#{java_default_home}/jre/lib/**/libjvm.so").returns( ['/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so'])
+  }
+
+  describe "java_libjvm_path" do
+    context 'returns libjvm path' do
+      context 'on Linux' do
+        it do
+          Facter.value(:java_libjvm_path).should == "/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server"
+        end
+      end
+    end
+  end
+end