UOCL-285: payment screen hanging

src/main/java/com/unicenta/pos/imports/CustomerCSVImport.java

@@ -308,7 +308,7 @@ public class CustomerCSVImport extends JPanel implements JPanelView {
       }
     };
     // pbWorker.execute();
-    customExecutor.execute(pbWorker);
+    customExecutor.submit(pbWorker);
   }
 
   /**

src/main/java/com/unicenta/pos/imports/JPanelCSVImport.java

@@ -324,7 +324,7 @@ public class JPanelCSVImport extends JPanel implements JPanelView {
             }
         };
         //pbWorker.execute();
-        customExecutor.execute(pbWorker);
+        customExecutor.submit(pbWorker);
     }
 
     /**

src/main/java/com/unicenta/pos/imports/StockQtyImport.java

@@ -543,7 +543,7 @@ public class StockQtyImport extends JPanel implements JPanelView {
       }
     };
     //pbWorker.execute();
-    customExecutor.execute(pbWorker);
+    customExecutor.submit(pbWorker);
   }
 
   /**

src/main/java/com/unicenta/pos/payment/JPaymentSelect.java

@@ -749,7 +749,7 @@ public abstract class JPaymentSelect extends javax.swing.JDialog
             };
 
             //worker.execute();
-            customExecutor.execute(worker);
+            customExecutor.submit(worker);
         }
         catch (Exception ex) {
             System.out.println(ex.getMessage());

src/main/java/com/unicenta/pos/transfer/Transfer.java

@@ -2735,7 +2735,7 @@ public final class Transfer extends JPanel implements JPanelView {
       };
 
       //worker.execute();
-      customExecutor.execute(worker);
+      customExecutor.submit(worker);
 
     }
     System.gc();