(MODULES-4069) Fail when required params are not available in params.

When overriding all values required for the java setup, there is
no need to fail if params.pp does not support the package.

manifests/init.pp

@@ -53,15 +53,11 @@ class java(
   Optional[String] $java_alternative_path                           = undef,
   Optional[String] $java_home                                       = undef
 ) {
-  include java::params
+  include ::java::params
 
-  if has_key($java::params::java, $distribution) {
+  $default_package_name = has_key($java::params::java, $distribution) ? {
-    $default_package_name     = $java::params::java[$distribution]['package']
+    false   => undef,
-    $default_alternative      = $java::params::java[$distribution]['alternative']
+    default => $java::params::java[$distribution]['package'],
-    $default_alternative_path = $java::params::java[$distribution]['alternative_path']
-    $default_java_home        = $java::params::java[$distribution]['java_home']
-  } else {
-    fail("Java distribution ${distribution} is not supported.")
   }
 
   $use_java_package_name = $package ? {
@@ -69,12 +65,17 @@ class java(
     default => $package,
   }
 
+
+  ## Weird logic........
   ## If $java_alternative is set, use that.
   ## Elsif the DEFAULT package is being used, then use $default_alternative.
   ## Else undef
   $use_java_alternative = $java_alternative ? {
-    undef   => $use_java_package_name ? {
+    undef                   => $use_java_package_name ? {
-      $default_package_name => $default_alternative,
+      $default_package_name => has_key($java::params::java, $distribution) ? {
+        default => $java::params::java[$distribution]['alternative'],
+        false => undef,
+      },
       default               => undef,
     },
     default => $java_alternative,
@@ -82,21 +83,38 @@ class java(
 
   ## Same logic as $java_alternative above.
   $use_java_alternative_path = $java_alternative_path ? {
-    undef   => $use_java_package_name ? {
+    undef                   => $use_java_package_name ? {
-      $default_package_name => $default_alternative_path,
+      $default_package_name => has_key($java::params::java, $distribution) ? {
+      default               => $java::params::java[$distribution]['alternative_path'],
+      false                 => undef,
+      },
       default               => undef,
     },
     default => $java_alternative_path,
   }
 
   $use_java_home = $java_home ? {
-    undef   => $use_java_package_name ? {
+    undef                   => $use_java_package_name ? {
-      $default_package_name => $default_java_home,
+      $default_package_name => has_key($java::params::java, $distribution) ? {
+        default             => $java::params::java[$distribution]['java_home'],
+        false               => undef,
+      },
       default               => undef,
     },
     default => $java_home,
   }
 
+  ## This should only be required if we did not override all the information we need.
+  # One of the defaults is missing and its not intentional:
+  if ((
+      $use_java_package_name == undef or $use_java_alternative == undef or
+      $use_java_alternative_path == undef or $use_java_home == undef
+    ) and (
+      ! has_key($::java::params::java, $distribution)
+    )) {
+    fail("Java distribution ${distribution} is not supported. Missing default values.")
+  }
+
   $jre_flag = $use_java_package_name ? {
     /headless/ => '--jre-headless',
     default    => '--jre'

spec/classes/java_spec.rb

@@ -245,6 +245,34 @@ describe 'java', :type => :class do
     it { is_expected.to contain_package('java').with_name('jre') }
   end
 
+  describe 'custom java package' do
+    let(:facts) { {:osfamily => 'Debian', :operatingsystem => 'Debian', :lsbdistcodename => 'jessie', :operatingsystemrelease => '8.6', :architecture => 'amd64',} }
+    context 'all params provided' do
+      let(:params) { {
+        'distribution'          => 'custom',
+        'package'               => 'custom_jdk',
+        'java_alternative'      => 'java-custom_jdk',
+        'java_alternative_path' => '/opt/custom_jdk/bin/java',
+        'java_home'             => '/opt/custom_jdk',
+      } }
+
+      it { is_expected.to contain_package('java').with_name('custom_jdk') }
+      it { is_expected.to contain_file_line('java-home-environment').with_line('JAVA_HOME=/opt/custom_jdk') }
+      it { is_expected.to contain_exec('update-java-alternatives').with_command('update-java-alternatives --set java-custom_jdk --jre') }
+
+    end
+    context 'missing parameters' do
+      let(:params) { {
+        'distribution' => 'custom',
+        'package' => 'custom_jdk',
+      } }
+      it do
+        expect { catalogue }.to raise_error Puppet::Error, /is not supported. Missing default values/
+      end
+    end
+  end
+
+
   describe 'incompatible OSs' do
     [
       {