Revert "Revert "UOCL-285: payment screen hanging (#42)""

This reverts commit acc38ba567.

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

@@ -41,6 +41,8 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 
 /**
@@ -276,6 +278,7 @@ public class CustomerCSVImport extends JPanel implements JPanelView {
    * the UI responsiveness.
    */
   private void setWorker() {
+    ExecutorService customExecutor = Executors.newCachedThreadPool();
     progress = 0;
     webPBar.setStringPainted(true);
 
@@ -304,7 +307,8 @@ public class CustomerCSVImport extends JPanel implements JPanelView {
         }
       }
     };
-    pbWorker.execute();
+    // pbWorker.execute();
+    customExecutor.submit(pbWorker);
   }
 
   /**

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

@@ -44,6 +44,8 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.UUID;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 
 /**
@@ -292,6 +294,7 @@ public class JPanelCSVImport extends JPanel implements JPanelView {
      * the UI responsiveness.
     */
     private void setWorker() {
+        ExecutorService customExecutor = Executors.newCachedThreadPool();
         progress = 0;
         webPBar.setStringPainted(true);
 
@@ -320,7 +323,8 @@ public class JPanelCSVImport extends JPanel implements JPanelView {
                 }    
             }
         };
-        pbWorker.execute();
+        //pbWorker.execute();
+        customExecutor.submit(pbWorker);
     }
 
     /**

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

@@ -43,6 +43,8 @@ import java.sql.SQLException;
 import java.util.List;
 import java.util.Properties;
 import java.util.UUID;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 
 /**
@@ -511,6 +513,7 @@ public class StockQtyImport extends JPanel implements JPanelView {
    * the UI responsiveness.
    */
   private void setWorker() {
+    ExecutorService customExecutor = Executors.newCachedThreadPool();
     progress = 0;
     webPBar.setStringPainted(true);
 
@@ -539,7 +542,8 @@ public class StockQtyImport extends JPanel implements JPanelView {
         }
       }
     };
-    pbWorker.execute();
+    //pbWorker.execute();
+    customExecutor.submit(pbWorker);
   }
 
   /**