Fix exception in ExtractReferences from pdf (#15308)

* Fix exception in ExtraRefernces Exception

* changelog

* revert

Author: Siedlerchr

CHANGELOG.md

@@ -44,6 +44,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We fixed an issue where the Windows installer was missing the JabRef icon. [#14965](https://github.com/JabRef/jabref/issues/14965)
 - We fixed an issue where quickly navigating up and down with the entry editor opened at the citations tab would lead to exception. [#15233](https://github.com/JabRef/jabref/pull/15233)
 - Fixed identifier selection not working on fresh start [#15000](https://github.com/JabRef/jabref/issues/15000)
+- We fixed an issue where an exception would be thrown when trying to extract references from a PDF [#15308](https://github.com/JabRef/jabref/pull/15308)
 
 ### Removed
 

jabgui/src/main/java/org/jabref/gui/maintable/ExtractReferencesAction.java

@@ -14,6 +14,7 @@
 import org.jabref.gui.actions.ActionHelper;
 import org.jabref.gui.actions.SimpleCommand;
 import org.jabref.gui.importer.ImportEntriesDialog;
+import org.jabref.gui.util.UiTaskExecutor;
 import org.jabref.logic.importer.ParserResult;
 import org.jabref.logic.importer.fileformat.pdf.RuleBasedBibliographyPdfImporter;
 import org.jabref.logic.importer.util.GrobidService;
@@ -44,7 +45,6 @@ public class ExtractReferencesAction extends SimpleCommand {
     private final StateManager stateManager;
     private final CliPreferences preferences;
     private final BibEntry entry;
-    private final LinkedFile linkedFile;
 
     private final RuleBasedBibliographyPdfImporter ruleBasedBibliographyPdfImporter;
 
@@ -67,10 +67,9 @@ private ExtractReferencesAction(@NonNull DialogService dialogService,
         this.stateManager = stateManager;
         this.preferences = preferences;
         this.entry = entry;
-        this.linkedFile = linkedFile;
         ruleBasedBibliographyPdfImporter = new RuleBasedBibliographyPdfImporter(preferences.getCitationKeyPatternPreferences());
 
-        if (this.linkedFile == null) {
+        if (linkedFile == null) {
             this.executable.bind(
                     ActionHelper.needsEntriesSelected(stateManager)
                                 .and(ActionHelper.hasLinkedFileForSelectedEntries(stateManager))
@@ -155,7 +154,9 @@ private void extractReferences(Iterator<Path> fileListIterator, ParserResult res
         }
 
         String cites = getCites(result.getDatabase().getEntries(), currentEntry);
-        currentEntry.setField(StandardField.CITES, cites);
+        UiTaskExecutor.runInJavaFXThread(() -> {
+            currentEntry.setField(StandardField.CITES, cites);
+        });
     }
 
     /// Creates the field content for the "cites" field. The field contains the citation keys of the imported entries.

test-support/src/manual-tests/issue-13689/issue-13689.bib

@@ -1,14 +1,14 @@
 @Misc{many,
-  author  = {Oliver Kopp and Carl Christian Snethlage and Christoph Schwentker},
-  title   = {JabRef: BibTeX-based literature management software},
-  year    = {2023},
-  doi     = {10.47397/tb/44-3/tb138kopp-jabref},
-  issn    = {0896-3207},
-  issue   = {138},
-  journal = {TUGboat},
-  number  = {3},
-  pages   = {441--447},
-  volume  = {44},
+    author  = {Oliver Kopp and Carl Christian Snethlage and Christoph Schwentker},
+    title   = {JabRef: BibTeX-based literature management software},
+    year    = {2023},
+    doi     = {10.47397/tb/44-3/tb138kopp-jabref},
+    issn    = {0896-3207},
+    issue   = {138},
+    journal = {TUGboat},
+    number  = {3},
+    pages   = {441--447},
+    volume  = {44},
 }
 
 @Misc{one,