feat: handle UploadException

Close #42

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/addons/errorwindow/ErrorManager.java

@@ -21,6 +21,7 @@
 
 package com.flowingcode.vaadin.addons.errorwindow;
 
+import com.vaadin.flow.server.UploadException;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
@@ -31,6 +32,14 @@ public final class ErrorManager {
 
   static {
     factories.put(Object.class, new DefaultErrorWindowFactory());
+    factories.put(UploadException.class, details -> {
+      Throwable cause = details.getThrowable().getCause();
+      if (cause != null) {
+        showError(cause);
+      } else {
+        getErrorWindowFactory(Exception.class).showError(details);
+      }
+    });
   }
 
   private ErrorManager() {

src/test/java/com/flowingcode/vaadin/addons/errorwindow/ErrorwindowDemo.java

@@ -27,6 +27,7 @@
 import com.vaadin.flow.component.checkbox.Checkbox;
 import com.vaadin.flow.component.notification.Notification;
 import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.component.upload.Upload;
 import com.vaadin.flow.router.PageTitle;
 
 @PageTitle("Error Window Demo")
@@ -92,6 +93,11 @@ public ErrorwindowDemo() {
               "Currently production mode is: " + System.getProperty("productionMode"));
         });
 
+    Upload upload = new Upload(new NullMemoryBuffer());
+    upload.addSucceededListener(ev -> {
+      throw new UnsupportedOperationException("File upload is not allowed");
+    });
+
     setSizeFull();
     add(
         productionModeCb,
@@ -102,5 +108,8 @@ public ErrorwindowDemo() {
 
     add(new Button("Navigation error",
         ev -> UI.getCurrent().navigate(ThrowInConstructorView.class)));
+
+    add(upload);
+
   }
 }

src/test/java/com/flowingcode/vaadin/addons/errorwindow/NullMemoryBuffer.java

@@ -0,0 +1,24 @@
+package com.flowingcode.vaadin.addons.errorwindow;
+
+import com.vaadin.flow.component.upload.receivers.MemoryBuffer;
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class NullMemoryBuffer extends MemoryBuffer {
+
+  @Override
+  public OutputStream receiveUpload(String fileName, String MIMEType) {
+    super.receiveUpload(fileName, MIMEType);
+    return new OutputStream() {
+      @Override
+      public void write(int b) throws IOException {
+        // do nothing
+      }
+
+      @Override
+      public void write(byte[] b, int off, int len) throws IOException {
+        // do nothing
+      }
+    };
+  }
+}