Fix saving on network drive under macOS

Fixes #10452

Workaround for https://bugs.openjdk.org/browse/JDK-8167023

CHANGELOG.md

@@ -38,6 +38,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We fixed an issue where it was possible to create a group with no name or with a group separator inside the name [#9776](https://github.com/JabRef/jabref/issues/9776)
 - Biblatex's `journaltitle` is now also respected for showing the journal information. [#10397](https://github.com/JabRef/jabref/issues/10397)
 - JabRef does not hang anymore when exporting via CLI. [#10380](https://github.com/JabRef/jabref/issues/10380)
+- We fixed an issue where it was not possible to save a library on a network share under macOS due to an exception when acquiring a file lock [#10452](https://github.com/JabRef/jabref/issues/10452)
 
 ### Removed
 

src/main/java/org/jabref/logic/exporter/AtomicFileOutputStream.java

@@ -61,7 +61,7 @@ public class AtomicFileOutputStream extends FilterOutputStream {
      */
     private final Path temporaryFile;
 
-    private final FileLock temporaryFileLock;
+    private FileLock temporaryFileLock;
 
     /**
      * A backup of the target file (if it exists), created when the stream is closed
@@ -106,7 +106,12 @@ public AtomicFileOutputStream(Path path) throws IOException {
         try {
             // Lock files (so that at least not another JabRef instance writes at the same time to the same tmp file)
             if (out instanceof FileOutputStream stream) {
-                temporaryFileLock = stream.getChannel().lock();
+                try {
+                    temporaryFileLock = stream.getChannel().tryLock();
+                } catch (IOException ex) {
+                    LOGGER.warn("Could not acquire file lock. Maybe we are on a network drive?", ex);
+                    temporaryFileLock = null;
+                }
             } else {
                 temporaryFileLock = null;
             }