Use xml / javaconfig folders for samples

Fixes gh-3752

samples/xml/preauth/preauth.gradle

@@ -0,0 +1,32 @@
+// Preauth sample build file
+
+apply plugin: 'war'
+apply plugin: 'jetty'
+
+war.baseName = "sample"
+
+def excludeModules = ['jsr250-api', 'ehcache', 'spring-jdbc', 'spring-tx']
+
+configurations {
+	excludeModules.each {name ->
+		runtime.exclude module: name
+	}
+
+	runtime.exclude group: 'org.aspectj'
+}
+
+dependencies {
+	providedCompile "javax.servlet:javax.servlet-api:3.0.1"
+
+	runtime project(':spring-security-web'),
+			project(':spring-security-config'),
+			"org.slf4j:jcl-over-slf4j:$slf4jVersion",
+			"ch.qos.logback:logback-classic:$logbackVersion"
+
+	testCompile project(':spring-security-web'),
+			project(':spring-security-config')
+}
+
+jettyRun {
+	userRealms = [jettyRun.class.classLoader.loadClass('org.mortbay.jetty.security.HashUserRealm').newInstance('Preauth Realm', "$projectDir/realm.properties")]
+}