fix: exception when opening already opened files

CHANGELOG.md

@@ -15,6 +15,8 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 
 ### Fixed
 
+- We fixed an issue where opening a library from the recent libraries menu was not possible [#5939](https://github.com/JabRef/jabref/issues/5939)
+
 ### Removed
 
 ## [5.0] – 2020-03-06
@@ -47,7 +49,6 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where entries containing Unicode charaters were not parsed correctly [#5899](https://github.com/JabRef/jabref/issues/5899)
 - We fixed an issue where an entry containing an external filename with curly braces could not be saved. Curly braces are now longer allowed in filenames. [#5899](https://github.com/JabRef/jabref/issues/5899)
 - We fixed an issue where changing the type of an entry did not update the main table [#5906](https://github.com/JabRef/jabref/issues/5906)
-- We fixed an issue where opening a library from the recent libraries menu was not possible [#5939](https://github.com/JabRef/jabref/issues/5939)
 - We fixed an issue in the optics of the library properties, that cropped the dialog on scaled displays. [#5969](https://github.com/JabRef/jabref/issues/5969)
 - We fixed an issue where changing the type of an entry did not update the main table. [#5906](https://github.com/JabRef/jabref/issues/5906)
 - We fixed an issue where opening a library from the recent libraries menu was not possible. [#5939](https://github.com/JabRef/jabref/issues/5939)

src/main/java/org/jabref/gui/importer/actions/OpenDatabaseAction.java

@@ -3,6 +3,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.sql.SQLException;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
@@ -42,11 +43,11 @@ public class OpenDatabaseAction extends SimpleCommand {
     // List of actions that may need to be called after opening the file. Such as
     // upgrade actions etc. that may depend on the JabRef version that wrote the file:
     private static final List<GUIPostOpenAction> POST_OPEN_ACTIONS = Arrays.asList(
-                                                                                   // Migrations:
-                                                                                   // Warning for migrating the Review into the Comment field
-                                                                                   new MergeReviewIntoCommentAction(),
-                                                                                   // Check for new custom entry types loaded from the BIB file:
-                                                                                   new CheckForNewEntryTypesAction());
+            // Migrations:
+            // Warning for migrating the Review into the Comment field
+            new MergeReviewIntoCommentAction(),
+            // Check for new custom entry types loaded from the BIB file:
+            new CheckForNewEntryTypesAction());
 
     private final JabRefFrame frame;
     private final DialogService dialogService;
@@ -84,7 +85,6 @@ public void execute() {
     }
 
     /**
-     *
      * @return Path of current panel database directory or the working directory
      */
     private Path getInitialDirectory() {
@@ -102,7 +102,7 @@ private Path getInitialDirectory() {
      * @param file the file, may be null or not existing
      */
     public void openFile(Path file, boolean raisePanel) {
-        openFiles(Arrays.asList(file), raisePanel);
+        openFiles(new ArrayList<>(List.of(file)), raisePanel);
     }
 
     /**
@@ -116,12 +116,12 @@ public void openFiles(List<Path> filesToOpen, boolean raisePanel) {
         int removed = 0;
 
         // Check if any of the files are already open:
-        for (Iterator<Path> iterator = filesToOpen.iterator(); iterator.hasNext();) {
+        for (Iterator<Path> iterator = filesToOpen.iterator(); iterator.hasNext(); ) {
             Path file = iterator.next();
             for (int i = 0; i < frame.getTabbedPane().getTabs().size(); i++) {
                 BasePanel basePanel = frame.getBasePanelAt(i);
                 if ((basePanel.getBibDatabaseContext().getDatabasePath().isPresent())
-                    && basePanel.getBibDatabaseContext().getDatabasePath().get().equals(file)) {
+                        && basePanel.getBibDatabaseContext().getDatabasePath().get().equals(file)) {
                     iterator.remove();
                     removed++;
                     // See if we removed the final one. If so, we must perhaps
@@ -169,10 +169,9 @@ private void openTheFile(Path file, boolean raisePanel) {
                               OpenDatabaseAction.performPostOpenActions(panel, result);
                           })
                           .onFailure(ex -> dialogService.showErrorDialogAndWait(Localization.lang("Connection error"),
-                                                                                           ex.getMessage() + "\n\n" + Localization.lang("A local copy will be opened.")))
+                                  ex.getMessage() + "\n\n" + Localization.lang("A local copy will be opened.")))
                           .executeWith(Globals.TASK_EXECUTOR);
         }
-
     }
 
     private ParserResult loadDatabase(Path file) throws Exception {
@@ -187,23 +186,21 @@ private ParserResult loadDatabase(Path file) throws Exception {
         }
 
         ParserResult result = OpenDatabase.loadDatabase(fileToLoad.toString(),
-                                                        Globals.prefs.getImportFormatPreferences(), Globals.getFileUpdateMonitor());
+                Globals.prefs.getImportFormatPreferences(), Globals.getFileUpdateMonitor());
 
         if (result.getDatabase().isShared()) {
             try {
                 new SharedDatabaseUIManager(frame).openSharedDatabaseFromParserResult(result);
             } catch (SQLException | DatabaseNotSupportedException | InvalidDBMSConnectionPropertiesException |
-                     NotASharedDatabaseException e) {
+                    NotASharedDatabaseException e) {
                 result.getDatabaseContext().clearDatabaseFile(); // do not open the original file
                 result.getDatabase().clearSharedDatabaseID();
                 LOGGER.error("Connection error", e);
 
                 throw e;
-
             }
         }
         return result;
-
     }
 
     private BasePanel addNewDatabase(ParserResult result, final Path file, boolean raisePanel) {
@@ -214,6 +211,5 @@ private BasePanel addNewDatabase(ParserResult result, final Path file, boolean r
         BasePanel basePanel = new BasePanel(frame, BasePanelPreferences.from(Globals.prefs), result.getDatabaseContext(), ExternalFileTypes.getInstance());
         frame.addTab(basePanel, raisePanel);
         return basePanel;
-
     }
 }