Migrate xml-helloworld groovy->java

This is a suggestion how to migrate the GebSpec based tests to Java / Selenium based tests.

Issue: gh-4939

samples/xml/helloworld/spring-security-samples-xml-helloworld.gradle

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2002-2018 the original author or authors.
+ *
+ * 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.
+ */
+
 apply plugin: 'io.spring.convention.spring-sample-war'
 
 dependencies {
@@ -9,5 +25,9 @@ dependencies {
 
 	providedCompile 'javax.servlet:javax.servlet-api'
 
-	integrationTestCompile gebDependencies
+	testCompile project(':spring-security-test')
+	testCompile 'org.skyscreamer:jsonassert'
+	testCompile 'org.springframework:spring-test'
+
+	integrationTestCompile seleniumDependencies
 }