Fix client-side error when Upload in TabSheet and Push (#8779)

* Fix client-side error when Upload in TabSheet and Push

Fixes #8728

* Merge 7.7 into 7.7-upload-in-tab-exception-fix

client/src/main/java/com/vaadin/client/ui/VUpload.java

@@ -249,10 +249,12 @@ public class VUpload extends SimplePanel {
                             t.cancel();
                         }
                         VConsole.log("VUpload:Submit complete");
-                        ((UploadConnector) ConnectorMap.get(client)
-                                .getConnector(VUpload.this))
-                                        .getRpcProxy(UploadServerRpc.class)
-                                        .poll();
+                        if (isAttached()) {
+                            // no need to call poll() if component is already
+                            // detached #8728
+                            ((UploadConnector) ConnectorMap.get(client).getConnector(VUpload.this))
+                                .getRpcProxy(UploadServerRpc.class).poll();
+                        }
                     }
 
                     rebuildPanel();

uitest/src/main/java/com/vaadin/tests/components/upload/UploadInTabsheet.java

@@ -0,0 +1,54 @@
+package com.vaadin.tests.components.upload;
+
+import java.io.ByteArrayOutputStream;
+import java.io.OutputStream;
+
+import com.vaadin.annotations.Push;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.TabSheet;
+import com.vaadin.ui.Upload;
+
+/**
+ * Test UI for case where Upload is in a TabSheet and Tab is changed directly
+ * after Upload Succeed
+ */
+@Push
+public class UploadInTabsheet extends AbstractTestUI {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        final TabSheet t = new TabSheet();
+        final Upload upload = new Upload("Upload", new Upload.Receiver() {
+            @Override
+            public OutputStream receiveUpload(String filename, String mimeType) {
+                return new ByteArrayOutputStream();
+            }
+        });
+        upload.setImmediate(false);
+        upload.addSucceededListener(new Upload.SucceededListener() {
+            @Override
+            public void uploadSucceeded(Upload.SucceededEvent event) {
+                upload.getUI().access(new Runnable() {
+                    @Override
+                    public void run() {
+                        t.setSelectedTab(1);
+                    }
+                });
+            }
+        });
+        upload.setWidthUndefined();
+
+        t.addComponent(upload);
+        t.addComponent(new Label("Second tab"));
+
+        addComponent(t);
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        return 8728;
+    }
+
+}

uitest/src/test/java/com/vaadin/tests/components/upload/UploadInTabsheetTest.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2000-2016 Vaadin Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.components.upload;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebElement;
+import org.openqa.selenium.internal.WrapsElement;
+import org.openqa.selenium.remote.DesiredCapabilities;
+import org.openqa.selenium.remote.LocalFileDetector;
+import org.openqa.selenium.remote.RemoteWebElement;
+
+import com.vaadin.testbench.elements.UploadElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+
+/**
+ * Verifies that there's no client side errors when changing a tab containing
+ * Upload right after uploading is succeeded (#8728)
+ */
+public class UploadInTabsheetTest extends MultiBrowserTest {
+
+    @Override
+    public List<DesiredCapabilities> getBrowsersToTest() {
+        // PhantomJS fails to upload files for unknown reasons
+        return getBrowsersExcludingPhantomJS();
+    }
+
+    @Test
+    public void testThatChangingTabAfterUploadDoesntCauseErrors()
+        throws Exception {
+        setDebug(true);
+        openTestURL();
+
+        File tempFile = createTempFile();
+        fillPathToUploadInput(tempFile.getPath());
+
+        getSubmitButton().click();
+
+        assertNoErrorNotifications();
+    }
+
+    /**
+     * @return The generated temp file handle
+     * @throws IOException
+     */
+    private File createTempFile() throws IOException {
+        File tempFile = File.createTempFile("TestFileUpload", ".txt");
+        BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));
+        writer.write(getTempFileContents());
+        writer.close();
+        tempFile.deleteOnExit();
+        return tempFile;
+    }
+
+    private String getTempFileContents() {
+        return "This is a test file!\nRow 2\nRow3";
+    }
+
+    private void fillPathToUploadInput(String tempFileName) throws Exception {
+        // create a valid path in upload input element. Instead of selecting a
+        // file by some file browsing dialog, we use the local path directly.
+        WebElement input = getInput();
+        setLocalFileDetector(input);
+        input.sendKeys(tempFileName);
+    }
+
+    private WebElement getSubmitButton() {
+        UploadElement upload = $(UploadElement.class).first();
+        WebElement submitButton = upload.findElement(By.className("v-button"));
+        return submitButton;
+    }
+
+    private WebElement getInput() {
+        return getDriver().findElement(By.className("gwt-FileUpload"));
+    }
+
+    private void setLocalFileDetector(WebElement element) throws Exception {
+        if (getRunLocallyBrowser() != null) {
+            return;
+        }
+
+        if (element instanceof WrapsElement) {
+            element = ((WrapsElement) element).getWrappedElement();
+        }
+        if (element instanceof RemoteWebElement) {
+            ((RemoteWebElement) element)
+                    .setFileDetector(new LocalFileDetector());
+        } else {
+            throw new IllegalArgumentException(
+                    "Expected argument of type RemoteWebElement, received "
+                            + element.getClass().getName());
+        }
+    }
+}