Fix initial Java migration

This commit fixes several issues with the initial java migration.

On MacOS, the name of the temp directory can be `T` and the new tgz API
requires a parent folder whose name has at least 3 characters.

The Selenium tests require a more precise element to show the advanced
section.

The integration tests were generation the docs snippet on the wrong
accept header.

initializr-generator/src/main/groovy/io/spring/initializr/generator/ProjectGenerator.groovy

@@ -67,9 +67,10 @@ class ProjectGenerator {
 	@Autowired
 	ProjectResourceLocator projectResourceLocator = new ProjectResourceLocator()
 
-	@Value('${TMPDIR:.}')
+	@Value('${TMPDIR:.}/initializr')
 	String tmpdir
 
+	private File temporaryDirectory
 	private transient Map<String, List<File>> temporaryFiles = [:]
 
 	/**
@@ -126,7 +127,7 @@ class ProjectGenerator {
 	protected File doGenerateProjectStructure(ProjectRequest request) {
 		def model = resolveModel(request)
 
-		def rootDir = File.createTempFile('tmp', '', new File(tmpdir))
+		def rootDir = File.createTempFile('tmp', '', getTemporaryDirectory())
 		addTempFile(rootDir.name, rootDir)
 		rootDir.delete()
 		rootDir.mkdirs()
@@ -182,11 +183,19 @@ class ProjectGenerator {
 	 * directory and extension
 	 */
 	File createDistributionFile(File dir, String extension) {
-		def download = new File(tmpdir, dir.name + extension)
+		def download = new File(getTemporaryDirectory(), dir.name + extension)
 		addTempFile(dir.name, download)
 		download
 	}
 
+	private File getTemporaryDirectory() {
+		if (!temporaryDirectory) {
+			temporaryDirectory = new File(tmpdir, 'initializr')
+			temporaryDirectory.mkdirs()
+		}
+		temporaryDirectory
+	}
+
 	/**
 	 * Clean all the temporary files that are related to this root
 	 * directory.

initializr-service/src/main/groovy/io/spring/initializr/service/InitializrService.groovy

@@ -19,7 +19,6 @@ package io.spring.initializr.service
 import java.util.concurrent.Executor
 
 import io.spring.initializr.metadata.InitializrMetadataProvider
-import io.spring.initializr.util.GroovyTemplate
 import io.spring.initializr.web.project.LegacyStsController
 
 import org.springframework.boot.SpringApplication
@@ -47,9 +46,8 @@ class InitializrService {
 	@Bean
 	@SuppressWarnings("deprecation")
 	LegacyStsController legacyStsController(InitializrMetadataProvider metadataProvider,
-											ResourceUrlProvider resourceUrlProvider,
-											GroovyTemplate groovyTemplate) {
-		new LegacyStsController(metadataProvider, resourceUrlProvider, groovyTemplate)
+											ResourceUrlProvider resourceUrlProvider) {
+		new LegacyStsController(metadataProvider, resourceUrlProvider)
 	}
 
 	@Configuration

initializr-web/src/test/java/io/spring/initializr/web/project/MainControllerIntegrationTests.java

@@ -169,9 +169,6 @@ public class MainControllerIntegrationTests
 
 	@Test
 	public void metadataWithV2AcceptHeader() {
-		getRequests().setFields("_links.maven-project", "dependencies.values[0]",
-				"type.values[0]", "javaVersion.values[0]", "packaging.values[0]",
-				"bootVersion.values[0]", "language.values[0]");
 		ResponseEntity<String> response = invokeHome(null,
 				"application/vnd.initializr.v2+json");
 		validateMetadata(response, InitializrMetadataVersion.V2.getMediaType(), "2.0.0",
@@ -180,6 +177,9 @@ public class MainControllerIntegrationTests
 
 	@Test
 	public void metadataWithCurrentAcceptHeader() {
+		getRequests().setFields("_links.maven-project", "dependencies.values[0]",
+				"type.values[0]", "javaVersion.values[0]", "packaging.values[0]",
+				"bootVersion.values[0]", "language.values[0]");
 		ResponseEntity<String> response = invokeHome(null,
 				"application/vnd.initializr.v2.1+json");
 		assertThat(response.getHeaders().getFirst(HttpHeaders.ETAG), not(nullValue()));

initializr-web/src/test/java/io/spring/initializr/web/project/NewGenerationSmokeTests.java

@@ -436,7 +436,8 @@ class HomePage {
 	}
 
 	public void advanced() {
-		form.findElement(By.cssSelector(".tofullversion")).click();
+		form.findElement(By.cssSelector(".tofullversion"))
+				.findElement(By.tagName("a")).click();
 	}
 
 	public void simple() {