Merge pull request #5288 from JabRef/javadocCheckstyle

Add checkstyle for JavaDoc and fix related issues

Author: Siedlerchr

config/checkstyle/checkstyle.xml

@@ -8,16 +8,30 @@
         <property name="header" value=""/>
     </module>
 
+    <module name="SuppressionFilter">
+        <property name="file" value="${config_loc}/suppressions.xml"/>
+    </module>
+
+    <module name="BeforeExecutionExclusionFileFilter">
+        <property name="fileNamePattern" value="module\-info\.java$"/>
+    </module>
+
     <module name="TreeWalker">
+        <!-- Checks for Javadoc comments: https://checkstyle.org/config_javadoc.html -->
+        <module name="InvalidJavadocPosition"/>
+        <module name="JavadocMethod">
+            <property name="allowUndeclaredRTE" value="true"/>
+            <property name="allowMissingParamTags" value="true"/>
+            <property name="allowMissingThrowsTags" value="true"/>
+            <property name="allowMissingReturnTag" value="true"/>
+            <property name="validateThrows" value="true"/>
+        </module>
 
+        <!-- Checks for imports: https://checkstyle.org/config_import.html -->
         <module name="UnusedImports"/>
-
         <module name="RedundantImport"/>
-
         <module name="AvoidStarImport"/>
-
         <module name="IllegalImport"/>
-
         <module name="ImportOrder">
             <property name="groups" value="java,javax,javafx,org.jabref,*"/>
             <property name="ordered" value="true"/>
@@ -26,17 +40,18 @@
             <property name="sortStaticImportsAlphabetically" value="true"/>
         </module>
 
+        <!-- Checks for common coding problems: https://checkstyle.org/config_coding.html -->
+        <module name="DeclarationOrder"/>
+
+        <!-- Checks for whitespace: https://checkstyle.org/config_whitespace.html -->
         <module name="EmptyLineSeparator">
             <property name="tokens"
                       value="IMPORT, CLASS_DEF, INTERFACE_DEF, ENUM_DEF, STATIC_INIT, INSTANCE_INIT, METHOD_DEF"/>
             <property name="allowMultipleEmptyLines" value="false"/>
             <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
         </module>
-
-        <module name="DeclarationOrder"/>
-
-        <!-- RCULRY causes issues if classes are nested within arrays, therefore not activated -->
         <module name="WhitespaceAround">
+            <!-- RCULRY causes issues if classes are nested within arrays, therefore not activated -->
             <property name="tokens"
                       value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, COLON, DIV,
                       DIV_ASSIGN, DO_WHILE, EQUAL, GE, GT, LAND, LCURLY, LE, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE,
@@ -46,18 +61,12 @@
                       SL, SLIST, SL_ASSIGN, SR, SR_ASSIGN, STAR, STAR_ASSIGN, LITERAL_ASSERT, TYPE_EXTENSION_AND"/>
         </module>
 
+        <!-- Checks for Naming Conventions: https://checkstyle.org/config_naming.html -->
         <module name="ConstantName">
             <property name="format" value="^log(ger)?|[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
         </module>
-            
-        <module name="NeedBraces"/>
-    </module>
 
-    <module name="SuppressionFilter">
-        <property name="file" value="${config_loc}/suppressions.xml"/>
-    </module>
-
-    <module name="BeforeExecutionExclusionFileFilter">
-        <property name="fileNamePattern" value="module\-info\.java$"/>
+        <!-- Checks for blocks: https://checkstyle.org/config_blocks.html -->
+        <module name="NeedBraces"/>
     </module>
 </module>

src/main/java/org/jabref/gui/util/RecursiveTreeItem.java

@@ -15,10 +15,7 @@
 import javafx.util.Callback;
 
 /**
- * Taken from https://gist.github.com/lestard/011e9ed4433f9eb791a8
- */
-
-/**
+ * @implNote Taken from https://gist.github.com/lestard/011e9ed4433f9eb791a8
  * @implNote As CheckBoxTreeItem extends TreeItem, this class will work for both.
  */
 public class RecursiveTreeItem<T> extends CheckBoxTreeItem<T> {

src/main/java/org/jabref/logic/bst/BibtexCaseChanger.java

@@ -137,7 +137,7 @@ private String doChangeCase(String s, FORMAT_MODE format) {
      * special with |colon|s.
      *
      * @param c
-     * @param i the current position. It points to the opening brace
+     * @param start the current position. It points to the opening brace
      * @param format
      * @return
      */

src/main/java/org/jabref/logic/bst/BibtexWidth.java

@@ -167,13 +167,6 @@ public static int getCharWidth(char c) {
         }
     }
 
-    /**
-     *
-     * @param toMeasure
-     * @param warn
-     *            may-be-null
-     * @return
-     */
     public static int width(String toMeasure) {
 
         /*