Print entry preview NullPointerException handling (#13776)

* feat: print entry preview NullPointerException handling

* fix: typo

* feat: added a CHANGELOG.md entry for the latest fix

* Update CHANGELOG.md

* fix: added full link to latest CHANGELOG.md

---------

Co-authored-by: Subhramit Basu <[email protected]>

Author: dcarpentiero

CHANGELOG.md

@@ -11,6 +11,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 
 ### Added
 
+- We fixed an issue where "Print preview" would throw a `NullPointerException` if no printers were available. [#13708](https://github.com/JabRef/jabref/issues/13708)
 - We added the option to enable the language server in the preferences. [#13697](https://github.com/JabRef/jabref/pull/13697)
 - We introduced an option in Preferences under (under Linked files -> Linked file name conventions) to automatically rename linked files when an entry data changes. [#11316](https://github.com/JabRef/jabref/issues/11316)
 - We added tooltips (on hover) for 'Library-specific file directory', 'User-specific file directory' and 'LaTeX file directory' fields of the library properties window. [#12269](https://github.com/JabRef/jabref/issues/12269)

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

@@ -248,6 +248,11 @@ private void highlightLayoutText() {
 
     public void print() {
         PrinterJob job = PrinterJob.createPrinterJob();
+        if (job == null) {
+            LOGGER.warn("PrinterJob.createPrinterJob() returned null; printing not available");
+            dialogService.showErrorDialogAndWait("Could not find an available printer");
+            return;
+        }
         if ((entry == null) || !dialogService.showPrintDialog(job)) {
             return;
         }