- Javadoc.

- checkstyle.version 8.18 -> 8.20.
- [LANG-1458] Add EMPTY_ARRAY constants to classes in
org.apache.commons.lang3.tuple

checkstyle.xml

@@ -20,7 +20,7 @@ limitations under the License.
     "-//Puppy Crawl//DTD Check Configuration 1.1//EN"
     "http://www.puppycrawl.com/dtds/configuration_1_1.dtd">
 
-<!-- commons lang customization of default Checkstyle behavior -->
+<!-- Apache Commons Lang customization of default Checkstyle behavior -->
 <module name="Checker">
   <property name="localeLanguage" value="en"/>
   <module name="JavadocPackage"/>
@@ -39,7 +39,6 @@ limitations under the License.
     <property name="file" value="checkstyle-suppressions.xml"/>
   </module>
   <module name="TreeWalker">
-    <property name="cacheFile" value="target/cachefile"/>
     <module name="AvoidStarImport"/>
     <module name="IllegalImport"/>
     <module name="RedundantImport"/>

pom.xml

@@ -597,7 +597,7 @@
     <commons.encoding>utf-8</commons.encoding>
 
     <checkstyle.plugin.version>3.0.0</checkstyle.plugin.version>
-    <checkstyle.version>8.18</checkstyle.version>
+    <checkstyle.version>8.20</checkstyle.version>
 
     <spotbugs.plugin.version>3.1.11</spotbugs.plugin.version>
     <japicmp.skip>false</japicmp.skip>

src/changes/changes.xml

@@ -49,6 +49,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action issue="LANG-1450" type="fix" dev="chtompki">Generate javadoc jar on build.</action>
     <action issue="LANG-1457" type="add" dev="ggregory">Add ExceptionUtils.throwableOfType(Throwable, Class) and friends.</action>
     <action issue="LANG-1458" type="add" dev="ggregory">Add EMPTY_ARRAY constants to classes in org.apache.commons.lang3.tuple.</action>
+    <action                   type="update" dev="ggregory">checkstyle.version 8.18 -> 8.20.</action>
   </release>
 
   <release version="3.9" date="2019-04-09" description="New features and bug fixes. Requires Java 8, supports Java 9, 10, 11">

src/main/java/org/apache/commons/lang3/tuple/ImmutablePair.java

@@ -46,6 +46,8 @@ public final class ImmutablePair<L, R> extends Pair<L, R> {
     /**
      * Returns the empty array singleton that can be assigned without compiler warning.
      *
+     * @param <L> the left element type
+     * @param <R> the right element type
      * @return the empty array singleton that can be assigned without compiler warning.
      *
      * @since 3.10.

src/main/java/org/apache/commons/lang3/tuple/ImmutableTriple.java

@@ -47,6 +47,9 @@ public final class ImmutableTriple<L, M, R> extends Triple<L, M, R> {
     /**
      * Returns the empty array singleton that can be assigned without compiler warning.
      *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
      * @return the empty array singleton that can be assigned without compiler warning.
      *
      * @since 3.10.

src/main/java/org/apache/commons/lang3/tuple/MutablePair.java

@@ -41,6 +41,8 @@ public class MutablePair<L, R> extends Pair<L, R> {
     /**
      * Returns the empty array singleton that can be assigned without compiler warning.
      *
+     * @param <L> the left element type
+     * @param <R> the right element type
      * @return the empty array singleton that can be assigned without compiler warning.
      *
      * @since 3.10.

src/main/java/org/apache/commons/lang3/tuple/MutableTriple.java

@@ -42,6 +42,9 @@ public class MutableTriple<L, M, R> extends Triple<L, M, R> {
     /**
      * Returns the empty array singleton that can be assigned without compiler warning.
      *
+     * @param <L> the left element type
+     * @param <M> the middle element type
+     * @param <R> the right element type
      * @return the empty array singleton that can be assigned without compiler warning.
      *
      * @since 3.10.