spring boot 2 mongo querydsl with kotlin on gradle not generating meta data classes I am using Spring boot 2,Mongo db with Kotlin and query dsl. I am not able to generate metadata classes. My build.gradle file has content dependencies { classpath("org.springframework.bootspring boot gradle plugin${springBootVersion}") classpath("org.jetbrains.kotlinkotlin gradle plugin${kotlinVersion}") classpath("org.jetbrains.kotlinkotlin allopen${kotlinVersion}") classpath "gradle.plugin.com.ewerk.gradle.pluginsquerydsl plugin1.0.7"...

Annotation class does not validate input as enum in Kotlin I'd like to create annotation instead of enum use it for when statement @Retention(AnnotationRetention.SOURCE) @IntDef(SELECT.toLong(), WEAR.toLong(), BAND.toLong()) annotation class CurrentState companion object { const val SELECT = 0 const val WEAR = 1 const val BAND = 2 } private fun handleFragment(@CurrentState state:Int) { val fragment:Fragment = when(state){ SELECT -> SelectDeviceFragment.newInstance() WEAR -> ConnectWatchFragment.newInstance()...

What is the use of Inflater in Android val view= inflater!!.inflate(R.layout.fragment_main_screen,container,false) I'm new to Android App Development. Please explain the purpose of inflater.

Accessing class generated by Annotation processor in the same round I am developing a annotation processor which generates 2 classes. The interesting thing is that one of the class is dependent on other. Example: We need to generate a class Foo which is dependent on another class Bar. Interestingly, class Bar is also generated in the Same round! public class Foo{ private Bar bar; } public class Bar{ } Do let me know, if it is possible to do it.

Delete Realm if error after Realm Migration I have a realm migration in an update i'm working on for an app and it works just fine when updating from the previous version of the app. However, if i install a version several updates old then it crashes with the "missing from scheme error". Is there a way to delete the realm file only if there are still missing models after the migration has completed?

how to deal with the Generic in Kotlin from java code code in java: public interface MvpPresenter { public void attachView(V view); public void detachView(boolean retainInstance); } when I write in kotlin: interface MvpPresenter { fun attachView(view: MvpView) fun detachView(retainInstance: Boolean) } fun attachView(view: V) compile error! So How can I deal with ? extend T in kotlin???

Coroutines Android 4.1: subsequent launches not working after blocking queue If I run a launch that blocks with a blocking queue inside, no other launch after that will run. This only happens on Android 4.1, other devices I tested with Android 6.0.1 and 7.0 work just fine. Here's an example: class MainActivity : AppCompatActivity() { private val blockingQueue = ArrayBlockingQueue(10) override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) launch { Log.d(javaClass.simpleName, "TEST 1") }...

How to scale-up or scale-down a Rect I am getting an image from our backend. Along with the URL of the image comes the Rect coordinates of a particular point in the image. Now, the image is quite large so when displayed on a ImageView, it's scaled down. This is where the problem comes in, the Rect coordinates sent from the backend, does not plot to the same position on the image. Please is there anyway, I can scale down or even scale up a Rect coordinates? I have seen answers like <a...

How set up retry config fetching in spring boot? I have config server and application fetches configs from this server. I want to set up retry mechanism of fetching. If config server is unavailable application shall sent requests for 10 minutes. In spring docs i found next configs spring.cloud.config.uri=http://localhost:9090 spring.cloud.config.fail-fast=true spring.cloud.config.retry.max-interval=10000 spring.cloud.config.retry.max-attempts=2000 But they change nothing. My app doesn't do retry requests it just fails with Caused by:...

How to transform a Custom Object List by excluding particular property in Kotlin? How to transform a List into a new List by excluding a property in T. data class User(val name: String, val age: Int) var userList = mutableListOf() var nameList= userList.map { it.name } If a List to be created without property 'age'. Like var withoutAgeList

Parse "yyyy-MM-dd'T'HH:mm:ss" to LocalDateTime in Kotlin by using annotation I want to parse String with template "yyyy-MM-dd'T'HHmmss" to LocalDateTime by using Annotation. I tried to parse through below coding but it throws me error. What should I do for fixing this error? Code: SearchREQ( @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HHmmss") @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) var departureDate: LocalDateTime, ) Thanks for your answer

Realm messes with Android data binding I have an app that builds OK but as soon as I make one of my classes Realm-aware by either @RealmClass/RealmModel or RealmObject I get a ton of errors like those below. Is this a bug or am I doing something wrong? e: C\Dane\Projekty\Livecycle\app\build\generated\data binding base class source out\debug\dataBindingGenBaseClassesDebug\out\pl\qus\livecycle\databinding\AccountsmoduleBinding.java49: error: cannot find symbol protected AccountsmoduleBinding(DataBindingComponent...

Read barcode info from bitmap using ML kit I want to get some info from barcode using my camera. It works when I use png image downloaded from site, but when I try to get it work with a photo I took, it outputs me the empty array. Seems like I need to make some preps with the image in order to make it work. Here is my code: fun getTheBarCode(bitmap: Bitmap) { val options = FirebaseVisionBarcodeDetectorOptions.Builder() .setBarcodeFormats( FirebaseVisionBarcode.FORMAT_AZTEC) .build()...

Retrofit POST request - parsing two JSON Objects having same name i am using retrofit for upload data to web service and i am getting response from web service accordingly. Upload data has following structure. and response contains following structure. As you can see upload data and response both contains data named object. So, my question is how can i make Model Class for handling this request and...

How to remove all keys pointing to given value Let's have the following (mutable) map: 1 -> A 45 -> A 88 -> R 98 -> X 105 -> A Now I want to remove all items pointing to A. I came up with the following code: // Version 1 myMap.forEach { key, value -> if (value == "A") myMap.remove(key) } // Version 2 with (myMap) { val filtered = filterValues { it != "A" } clear() putAll(filtered) } But somehow none of it seems right. So what is the correct, most elegant way?

How do you program to interface in Kotlin? In Java we can have code like this: List a = new ArrayList(); How can we do that in Kotlin?

android studio the '-d' option with a directory destination is ignored because '-Xbuild-file' is specified I am new to android development and just created my first "hello world" project in android studio 3.2 ( canary ) following this tutorial. https://developer.android.com/jetpack/docs/getting-started and then I just did Build- > make project project tried to build and gave me following error. Could not get unknown property 'archLifecycleVersion' for root project 'JetpackHelloWorld' of type...

Why do optionals in Kotlin require explicit initialisation? When defining an optional property in a class, Kotlin requires that it is explicitly initialised as null, like so: var myString: String? = null Is there any reason that the compiler cannot infer this initial value? I believe Swift would let you skip the = null part, however this is a compiler error in Kotlin. Wouldn't it be simpler to automatically have the value null after writing the following? var myString: String?

Keep reference of an activity in the companion object I have 2 activities: MainActivity and MySecondActivity. I start MySecondActivity, but while I'm working in it, I receive a callback from an external library in MainActivity. This callback should update some information in MySecondActivity. Question: Can I keep a reference of MySecondActivity in MainActivity in order to update it later ? Basically it would be like this: val mySecondIntent = Intent(applicationContext, MySecondActivity::class.java) startActivity(mySecondIntent) (...) fun...

Kotlin - Using apply or also on hashmap doesn't work as expected Here's a snippet where I'm trying to build some query params for an api call. The functions below attempt to add an entry into an existing hashmap : // Using Apply to insert another entry : fun getParamsUsingApply(): HashMap { return getBasicParams().apply { KEY to ANOTHER_VALUE } } // Using also to insert another entry : fun getParamsUsingAlso(): HashMap { return getBasicParams().also { KEY to ANOTHER_VALUE } } I find this confusing, I expect my hashmap above to have the...

Should I have a single POJO class representing all possible columns returned from a Room Table? This is currently my data class in Kotlin representing a File. Room is able to return columns by constructing POJO's that you specify in the return type as long as the column info matches. Depending on the use case, such as showing the model as a view or storing it, I require different columns. Should I create POJOs for each of those cases or use the one below since I can have null fields? My concern is primarily memory, since null values still create pointers that occupy space. Maintaining...

How can I create single-thread coroutine context under Common pool in Kotlin? Short requirement: have ability to create corotine context, which will executed in the single thread only (e.g. without parallelism). Additional requirement: it is better to use existing CommonPool (e.g. Thread Pool) for these tasks Actually kotlin coroutines have method newSingleThreadContext which will create separate thread and schedule all tasks into it. However, this is dedicated thread, so ~1000 such contexts will require a lot of resources. Therefore, I'd like to have context with...

Kotlin: Constructor of inner class can be called only with receiver of containing class I was trying inner classes in Kotlin and came across this error but didn't quite understand it. I tried to look at the documentation here but didn't quite get any direction as to how outer classes can access inner class constructors class OuterClass { fun someFun(): InnerClassSuper { return InnerClassX("Hello") //Error: Constructor of inner class InnerClassX can be called only with...

Redownloading android studio says that Sdk component not found 2.I have first download and then deleted due to some issues now redownloding says Sdk components missing .plz help me out this

Kotlin OAuth 2.0 library? I'm creating an Android application in Kotlin where I have to log in with OAuth 2.0. What is the best way to do this? Is there a library for this?

Not able to use Daggger in my application I don't really understand why is that happening but I'm not able to use Dagger in my application. When I'm not using dagger but it's added to the gradle the app is running. But when I import for exmaple: import dagger.Component then I got this error message: org.gradle.initialization.ReportedException: org.gradle.internal.exceptions.LocationAwareException: Execution failed for task 'appkaptDebugKotlin' I tried everything what I found about this issue but nothing seems to work for me....

Update list adapter from another class I am developing my first application in kotlin, and I have encountered the following problem: I have a "RecyclerView" in my activity with a method of updating it class GroupsActivity : AppCompatActivity() { val TAG = "GroupsActivity" companion object { var active: Boolean = false var tableModel: List? = null } fun updateList() { rv_list.adapter = GroupsListAdapter(this, tableModel) } override fun onCreate(savedInstanceState: Bundle?) {...

Wrap extension function into another I want to simplify my code. I have implemented a way to hide the soft keyboard when I touch the screen using a SearchView. I show you the code... Call (inside an activity where sv is an instance of a SearchView) hideKeyboard(this, sv) Fun extensions fun Activity.hideKeyboard(context: Context, sv: SearchView) { hideKeyboard(HideKeyboardWithSearchView(context, sv)) } fun Activity.hideKeyboard(hideKeyboard: HideKeyboardWithSearchView) {...

Dynamicly changing/resizing textmanipulator tornadofx Maybe my problem is solved quickly but after 3 days of trying I see no other way than asking the community. I am working on a XML Manipulator via tornadofx. I am new to tornadofx. My plan is to input a XML file of any kind or format and than get a kind of UI to manipulate the file. After this is done I want to write the file back. For example this: - - ui_settlement_building_church 400 5 2 - Should looks like this: <a href="" rel="nofollow...

Difference between class references in Kotlin I found that there are (at least) two ways to reference a class in kotlin: var tempRecipe: RecipeTemplate? = null and var tempRecipe2 = RecipeTemplate::class What's the difference between the two?