Clicking a DOI link in the preview pane no longer crashes

CHANGELOG.md

@@ -57,6 +57,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - The default directory of the "LaTeX Citations" tab is now the directory of the currently opened database (and not the directory chosen at the last open file dialog or the last database save) [koppor#538](https://github.com/koppor/jabref/issues/538)
 - We fixed an issue where right-clicking on a tab and selecting close will close the focused tab even if it is not the tab we right-clicked [#8193](https://github.com/JabRef/jabref/pull/8193)
 - We fixed an issue where selecting a citation style in the preferences would sometimes produce an exception [#7860](https://github.com/JabRef/jabref/issues/7860)
+- We fixed an issue where an exception would occur when clicking on a DOI link in the preview pane [#7706](https://github.com/JabRef/jabref/issues/7706)
 
 ### Removed
 

src/main/java/org/jabref/gui/preview/PreviewViewer.java

@@ -1,5 +1,7 @@
 package org.jabref.gui.preview;
 
+import java.io.IOException;
+import java.net.MalformedURLException;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.regex.Pattern;
@@ -17,6 +19,7 @@
 import org.jabref.gui.DialogService;
 import org.jabref.gui.Globals;
 import org.jabref.gui.StateManager;
+import org.jabref.gui.desktop.JabRefDesktop;
 import org.jabref.gui.util.BackgroundTask;
 import org.jabref.gui.util.TaskExecutor;
 import org.jabref.gui.util.Theme;
@@ -30,6 +33,10 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.w3c.dom.events.EventTarget;
+import org.w3c.dom.html.HTMLAnchorElement;
 
 /**
  * Displays an BibEntry using the given layout format.
@@ -137,6 +144,26 @@ public PreviewViewer(BibDatabaseContext database, DialogService dialogService, S
                 registered = true;
             }
             highlightSearchPattern();
+
+            // https://stackoverflow.com/questions/15555510/javafx-stop-opening-url-in-webview-open-in-browser-instead
+            NodeList anchorList = previewView.getEngine().getDocument().getElementsByTagName("a");
+            for (int i = 0; i < anchorList.getLength(); i++) {
+                Node node = anchorList.item(i);
+                EventTarget eventTarget = (EventTarget) node;
+                eventTarget.addEventListener("click", evt -> {
+                    EventTarget target = evt.getCurrentTarget();
+                    HTMLAnchorElement anchorElement = (HTMLAnchorElement) target;
+                    String href = anchorElement.getHref();
+                    try {
+                        JabRefDesktop.openBrowser(href);
+                    } catch (MalformedURLException exception) {
+                        LOGGER.error("Invalid URL", exception);
+                    } catch (IOException exception) {
+                        LOGGER.error("Invalid URL Input", exception);
+                    }
+                    evt.preventDefault();
+                }, false);
+            }
         });
     }