private void execute()

in spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/intTest/java/org/springframework/boot/maven/MavenBuild.java [125:197]
70 lines of code
7 McCabe index (conditional complexity)

	private void execute(ProjectCallback callback, int expectedExitCode) {
		Invoker invoker = new DefaultInvoker();
		invoker.setMavenHome(this.home);
		InvocationRequest request = new DefaultInvocationRequest();
		try {
			Path destination = this.temp.toPath();
			Path source = this.projectDir.toPath();
			Files.walkFileTree(source, new SimpleFileVisitor<Path>() {

				@Override
				public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
					Files.createDirectories(destination.resolve(source.relativize(dir)));
					return FileVisitResult.CONTINUE;
				}

				@Override
				public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
					if (file.toFile().getName().equals("pom.xml")) {
						String pomXml = new String(Files.readAllBytes(file), StandardCharsets.UTF_8);
						for (Entry<String, String> replacement : MavenBuild.this.pomReplacements.entrySet()) {
							pomXml = pomXml.replace("@" + replacement.getKey() + "@", replacement.getValue());
						}
						Files.write(destination.resolve(source.relativize(file)),
								pomXml.getBytes(StandardCharsets.UTF_8), StandardOpenOption.CREATE_NEW);
					}
					else {
						Files.copy(file, destination.resolve(source.relativize(file)),
								StandardCopyOption.REPLACE_EXISTING);
					}
					return FileVisitResult.CONTINUE;
				}

			});
			String settingsXml = new String(Files.readAllBytes(Paths.get("src", "intTest", "projects", "settings.xml")),
					StandardCharsets.UTF_8)
							.replace("@localCentralUrl@",
									new File("build/int-test-maven-repository").toURI().toURL().toString())
							.replace("@localRepositoryPath@",
									new File("build/local-maven-repository").getAbsolutePath());
			Files.write(destination.resolve("settings.xml"), settingsXml.getBytes(StandardCharsets.UTF_8),
					StandardOpenOption.CREATE_NEW);
			request.setBaseDirectory(this.temp);
			request.setJavaHome(new File(System.getProperty("java.home")));
			request.setProperties(this.properties);
			request.setGoals(this.goals.isEmpty() ? Collections.singletonList("package") : this.goals);
			request.setUserSettingsFile(new File(this.temp, "settings.xml"));
			request.setUpdateSnapshots(true);
			request.setBatchMode(true);
			File target = new File(this.temp, "target");
			target.mkdirs();
			if (this.preparation != null) {
				this.preparation.doWith(this.temp);
			}
			File buildLogFile = new File(target, "build.log");
			try (PrintWriter buildLog = new PrintWriter(new FileWriter(buildLogFile))) {
				request.setOutputHandler((line) -> {
					buildLog.println(line);
					buildLog.flush();
				});
				try {
					InvocationResult result = invoker.execute(request);
					assertThat(result.getExitCode()).as(contentOf(buildLogFile)).isEqualTo(expectedExitCode);
				}
				catch (MavenInvocationException ex) {
					throw new RuntimeException(ex);
				}
			}
			callback.doWith(this.temp);
		}
		catch (Exception ex) {
			throw new RuntimeException(ex);
		}
	}