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

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open class OfflineCacheInterceptorWithHeader : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        var request = chain.request()
        val header = request.headers["Cacheable"]

        if (header != null) {
            /* check if this request has the [Cacheable] header */
            if (header == "true" &&
                !PaymentApp.instance!!.isNetworkConnected()

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    @Test(expected = NotFoundException::class)
    @Throws(Exception::class)
    fun testIfCustomAnnotationIsPresent() {
        val httpLoggingInterceptor = HttpLoggingInterceptor(
            HttpLoggingInterceptor.Logger { message: String? -> Timber.i(message) }
        )
        httpLoggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
        val networkInterceptor = NetworkInterceptor()

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    @GET(Constant.PAYMENT_TYPES)
    @Headers("Cacheable: true")
    fun getPaymentTypesWithHeaders(): Call<MutableList<PaymentType>>

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    @Cacheable
    @GET(Constant.PAYMENT_TYPES)
    fun getPaymentTypes(): Call<MutableList<PaymentType>>

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        //OkHttpClient
        val okHttpClient: OkHttpClient = OkHttpClient().newBuilder()
            .cache(cache())
            .addInterceptor(httpLoggingInterceptor)
            .addNetworkInterceptor(networkInterceptor) // only used when network is on
            .addInterceptor(offlineCacheInterceptor)
            .build()

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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)

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            if (annotation != null &&
                annotation.annotationClass.simpleName.equals("Cacheable") &&
                !PaymentApp.instance!!.isNetworkConnected()) {
          
                // prevent caching when network is on. For that we use the "networkInterceptor"
                Timber.d("cache interceptor: called.")
                val cacheControl = CacheControl.Builder()
                    .maxStale(7, TimeUnit.DAYS)
                    .build()