Implement options and method references

docs/pages/release_notes.md

@@ -32,11 +32,14 @@ This is a {{ site.pmd.release_type }} release.
     *   [#1372](https://github.com/pmd/pmd/issues/1372): \[java] false positive for UselessQualifiedThis
 
 ### API Changes
-{% assign javadoc_context = "core @.lang.ast.xpath" %}
+
+{% jdoc_context "core @.lang.ast.xpath" %}
 
 * The implementation of the adapters for the XPath engines Saxon and Jaxen (package {% jdoc_package @ %})
   are now deprecated. They'll be moved to an internal package come 7.0.0. Only {% jdoc @.Attribute %} remains public API.
 
+{% endjdoc_context %}
+
 ### External Contributions
 
 *   [#1384](https://github.com/pmd/pmd/pull/1384): \[java] New Rule - UseUnderscoresInNumericLiterals - [RajeshR](https://github.com/rajeshggwp)

pmd-core/src/main/java/net/sourceforge/pmd/properties/LongMultiProperty.java

@@ -6,7 +6,9 @@ package net.sourceforge.pmd.properties;
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.Set;
 
+import net.sourceforge.pmd.PMDConfiguration;
 import net.sourceforge.pmd.properties.builders.MultiNumericPropertyBuilder;
 import net.sourceforge.pmd.properties.builders.PropertyDescriptorBuilderConversionWrapper;