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How to Deploy a Spring Boot App with Docker to DigitalOcean App Platform

Introduction

DigitalOcean App platform is a Platform-as-a-service (Paas) that allows developers to publish code directly to DigialOcean servers without worrying about the underlying infrastructure. The Platform supports two ways to build an image for your app: Cloud Native Buildpacks and Dockerfiles.

When an app is deployed to the App Platform either via GitHub or DockerHub, it defaults to using Dockerfile if one is present in the root directory or specified app spec. Otherwise, the App Platform checks your code to determine what language or framework it uses. If it supports the language or framework, it chooses an appropriate resource type and uses the proper buildpack to build the app and deploy a container.

Java/Spring boot is no

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public class App extends Application {
    private static final String TAG = App.class.getSimpleName();
    private static final String BASE_URL = "https://66d252d7-61d1-44e0-be70-1f77477ac86c.mock.pstmn.io";

    private static App INSTANCE;


    private ApiService apiService;

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public class PlacePredictionProgrammatically extends AppCompatActivity {
    private static final String TAG = PlacePredictionProgrammatically.class.getSimpleName();
    private EditText queryText;
    private Button mSearchButton;
    private TextView mSearchResult;
    private StringBuilder mResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

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public class SyncDataWorker extends Worker {
    private BookService bookService;
    private BookDao bookDao;

    private static final String TAG = SyncDataWorker.class.getSimpleName();

    public SyncDataWorker(@NonNull Context appContext, @NonNull WorkerParameters workerParams) {
        super(appContext, workerParams);
        bookService = App.get().getBookService();
        bookDao = App.get().getBookDao();

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/**
 * Created by Ikhiloya Imokhai on 2019-10-19.
 * <p>
 * Retrofit Interceptor to intercept and decrypt response from the server
 */
public class DecryptionInterceptor implements Interceptor {

    private final CryptoStrategy mDecryptionStrategy;

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   //check if the token is in the blacklist 
  if (StringUtils.hasText(jwt) && jwtTokenBlacklistRepository.findByToken(jwt).isPresent()) {
            LOG.info("blacklisted token");
            ((HttpServletResponse) servletResponse).sendError(HttpServletResponse.SC_UNAUTHORIZED, "Invalid token");
        } 

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//Java
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("<your html file>"); //not in scope of this gist
webview.setWebViewClient(new WebViewClient(){
    public void onPageFinished(WebView view, String url){   
        //Here you want to use .loadUrl again 
        //on the webview object and pass in 
        //"javascript:<your javaScript function"
        webview.loadUrl("javascript:myJavaScriptFunc('" + argumentPassingIn + "')"); //if passing in an object. Mapping may need to take place
    }           

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class NetworkInterceptor: Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        Timber.d("network interceptor: called.")

        val response = chain.proceed(chain.request())

        val cacheControl = CacheControl.Builder()
            .maxAge(5, TimeUnit.SECONDS)
            .build()

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    private fun cache(): Cache? {
        val cacheSize = 5 * 1024 * 1024.toLong()
        return Cache(instance!!.applicationContext.cacheDir, cacheSize)
    }

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open class OfflineCacheInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        var request = chain.request()
        val invocation: Invocation? = request.tag(Invocation::class.java)

        if (invocation != null) {
            val annotation: Cacheable? =
                invocation.method().getAnnotation(Cacheable::class.java)