ensure wallet export file streams are always closed

src/main/java/com/sparrowwallet/sparrow/control/FileWalletExportPane.java

@@ -127,9 +127,10 @@ public class FileWalletExportPane extends TitledDescriptionPane {
     private void exportWallet(File file, Wallet exportWallet) {
         try {
             if(file != null) {
-                OutputStream outputStream = new FileOutputStream(file);
-                exporter.exportWallet(exportWallet, outputStream);
-                EventManager.get().post(new WalletExportEvent(exportWallet));
+                try(OutputStream outputStream = new FileOutputStream(file)) {
+                    exporter.exportWallet(exportWallet, outputStream);
+                    EventManager.get().post(new WalletExportEvent(exportWallet));
+                }
             } else {
                 ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
                 exporter.exportWallet(exportWallet, outputStream);

src/main/java/com/sparrowwallet/sparrow/io/ColdcardMultisig.java

@@ -202,7 +202,6 @@ public class ColdcardMultisig implements WalletImport, KeystoreFileImport, Walle
             }
 
             writer.flush();
-            writer.close();
         } catch(Exception e) {
             log.error("Error exporting Coldcard multisig wallet", e);
             throw new ExportException("Error exporting Coldcard multisig wallet", e);

src/main/java/com/sparrowwallet/sparrow/io/Electrum.java

@@ -367,7 +367,6 @@ public class Electrum implements KeystoreFileImport, WalletImport, WalletExport
             String json = gson.toJson(eJson);
             outputStream.write(json.getBytes(StandardCharsets.UTF_8));
             outputStream.flush();
-            outputStream.close();
         } catch (Exception e) {
             log.error("Error exporting Electrum Wallet", e);
             throw new ExportException("Error exporting Electrum Wallet", e);

src/main/java/com/sparrowwallet/sparrow/io/Sparrow.java

@@ -28,7 +28,6 @@ public class Sparrow implements WalletExport {
             Storage storage = AppServices.get().getOpenWallets().get(wallet);
             Files.copy(storage.getWalletFile().toPath(), outputStream);
             outputStream.flush();
-            outputStream.close();
         } catch(Exception e) {
             log.error("Error exporting Sparrow wallet file", e);
             throw new ExportException("Error exporting Sparrow wallet file", e);

src/main/java/com/sparrowwallet/sparrow/io/SpecterDesktop.java

@@ -31,7 +31,6 @@ public class SpecterDesktop implements WalletImport, WalletExport {
             String json = gson.toJson(specterWallet);
             outputStream.write(json.getBytes(StandardCharsets.UTF_8));
             outputStream.flush();
-            outputStream.close();
         } catch(Exception e) {
             log.error("Error exporting Specter Desktop wallet", e);
             throw new ExportException("Error exporting Specter Desktop wallet", e);