Use text blocks and fix checkstyle issues

todolist/core/src/test/java/todolist/json/TodoModuleTest.java

@@ -27,7 +27,26 @@ public class TodoModuleTest {
     mapper.registerModule(new TodoModule());
   }
 
-  private final static String todoListWithTwoItems = "{\"lists\":[{\"name\":\"todo\",\"items\":[{\"text\":\"item1\",\"checked\":false},{\"text\":\"item2\",\"checked\":true,\"deadline\":\"2020-10-01T14:53:11\"}]}]}";
+  private final static String todoListWithTwoItems = """
+    {
+      "lists": [
+        {
+          "name": "todo",
+          "items": [
+            {
+              "text": "item1",
+              "checked": false
+            },
+            {
+              "text": "item2",
+              "checked": true,
+              "deadline": "2020-10-01T14:53:11"
+            }
+          ]
+        }
+      ]
+    }
+    """;
 
   @Test
   public void testSerializers() {

todolist/fxui/pom.xml

@@ -93,7 +93,7 @@
                     <plugin>
                         <groupId>org.openjfx</groupId>
                         <artifactId>javafx-maven-plugin</artifactId>
-                        <version>0.0.5</version>
+                        <version>0.0.6</version>
                         <configuration>                    
                             <mainClass>de.jensd.fx.glyphs.fontawesome.demo.FontAwesomeIconsDemoApp</mainClass>
                         </configuration>
@@ -108,7 +108,7 @@
                     <plugin>
                         <groupId>org.openjfx</groupId>
                         <artifactId>javafx-maven-plugin</artifactId>
-                        <version>0.0.5</version>
+                        <version>0.0.6</version>
                         <configuration>                    
                             <mainClass>todolist.ui.TodoDocumentApp</mainClass>
                         </configuration>
@@ -123,7 +123,7 @@
                     <plugin>
                         <groupId>org.openjfx</groupId>
                         <artifactId>javafx-maven-plugin</artifactId>
-                        <version>0.0.5</version>
+                        <version>0.0.6</version>
                         <configuration>                    
                             <mainClass>todolist.ui.TodoRemoteApp</mainClass>
                         </configuration>
@@ -177,7 +177,7 @@
             <plugin>
                 <groupId>org.openjfx</groupId>
                 <artifactId>javafx-maven-plugin</artifactId>
-                <version>0.0.5</version>
+                <version>0.0.6</version>
                 <configuration>
                     <mainClass>todolist.ui.TodoApp</mainClass>
                 </configuration>

todolist/fxutil/src/main/java/fxutil/doc/DocumentPersistence.java

@@ -4,8 +4,8 @@ package fxutil.doc;
  * Interface for the documents that can be loaded and saved,
  * so they can support the operations of a file menu.
  *
- * @param <D>
- * @param <L>
+ * @param <D> The type of the document content
+ * @param <L> The type of the location
  */
 public interface DocumentPersistence<D, L> extends DocumentLoader<D>, DocumentSaver<D, L> {
 }

todolist/fxutil/src/main/java/fxutil/doc/FileMenuController.java

@@ -24,7 +24,7 @@ import javafx.scene.control.TextInputDialog;
 import javafx.stage.FileChooser;
 
 /**
- * Controller for the file menu
+ * Controller for the file menu.
  */
 public class FileMenuController {
 

todolist/pom.xml

@@ -66,7 +66,7 @@
                     <version>3.8.1</version>
                     <configuration>
                         <encoding>UTF-8</encoding>
-                        <release>14</release>
+                        <release>16</release>
                     </configuration>
                 </plugin>
                 <plugin>