fix: downgrade commons-demo because of jdk11 support

Author: mlopezFC

pom.xml

@@ -61,7 +61,7 @@
             <dependency>
             	<groupId>com.flowingcode.vaadin.addons.demo</groupId>
             	<artifactId>commons-demo</artifactId>
-            	<version>4.1.0</version>
+            	<version>3.6.0</version>
             </dependency>
 		</dependencies>
 	</dependencyManagement>
@@ -209,8 +209,7 @@
 			<groupId>javax.servlet</groupId>
 			<artifactId>javax.servlet-api</artifactId>
 			<version>3.1.0</version>
-			<type>jar</type>
-			<scope>test</scope>
+			<scope>provided</scope>
 		</dependency>
 		<dependency>
 			<groupId>io.github.bonigarcia</groupId>

src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java

@@ -20,7 +20,6 @@
 package com.flowingcode.vaadin.addons.gridexporter;
 
 import com.flowingcode.vaadin.addons.demo.DemoSource;
-import com.flowingcode.vaadin.addons.demo.SourceCodeViewer;
 import com.flowingcode.vaadin.addons.gridhelpers.GridHelper;
 import com.flowingcode.vaadin.addons.gridhelpers.HeightMode;
 import com.github.javafaker.Faker;
@@ -40,7 +39,6 @@
 import org.apache.poi.EncryptedDocumentException;
 
 @DemoSource
-@DemoSource(clazz = VaadinServiceInitListenerImpl.class)
 @PageTitle("Big Dataset")
 @Route(value = "gridexporter/bigdataset", layout = GridExporterDemoView.class)
 @SuppressWarnings("serial")
@@ -103,9 +101,6 @@ public GridExporterBigDatasetDemo() throws EncryptedDocumentException, IOExcepti
 
 
     add(block1, grid, block2);
-    SourceCodeViewer.highlightOnHover(block1, "concurrent");
-    SourceCodeViewer.highlightOnHover(block2,
-        "VaadinServiceInitListenerImpl.java#setConcurrentDownloadTimeout");
     // #endif
     // begin-block concurrent
     exporter.setConcurrentDownloadCost(9);