Allow mvn launch and shade plugin of UI sample

spring-bootstrap-samples/pom.xml

@@ -87,6 +87,14 @@
 						</execution>
 					</executions>
 				</plugin>
+                <plugin>
+                  <groupId>org.codehaus.mojo</groupId>
+                  <artifactId>exec-maven-plugin</artifactId>
+                  <configuration>
+					<includePluginDependencies>true</includePluginDependencies>
+                    <mainClass>${start-class}</mainClass>
+                  </configuration>
+                </plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-shade-plugin</artifactId>

spring-bootstrap-samples/spring-bootstrap-ui-sample/pom.xml

@@ -54,7 +54,10 @@
 				<artifactId>maven-dependency-plugin</artifactId>
 			</plugin>
 			<plugin>
-				<artifactId>maven-assembly-plugin</artifactId>
+				<artifactId>maven-shade-plugin</artifactId>
+			</plugin>
+			<plugin>
+				<artifactId>maven-exec-plugin</artifactId>
 			</plugin>
 		</plugins>
 	</build>