Getting a NoClassDefFoundError when calling a kotlin extension function - kotlin

I'm using the Android Studio 3.0 Beta 2 Canary Preview, and am calling a Kotlin extension function from Java:
The Kotlin code:
fun Metadata.validate(context: Context) {
validateInnerList(context)
// other validation functions
}
private fun Metadata.validateInnerList(context: Context) {
taskGroupList.removeIf { !it.isDataValid() } // error goes here
}
the java code:
metadataDecoratorKt.validate(metadata, context);
The code compiles fine, but during runtime calling it gives me a - java.lang.NoClassDefFoundError
Am I doing something wrong? is there an error on Intellij's side?
If more information is needed please say so.

Related

Kotlin class servlet provoke NoClassDefFoundError

In a sample Java servlet project in my IntelliJ IDE, i have created this class in Kotlin :
#WebServlet(name = "TwitterAPIServlet", description = "This is used to test the servlet api", urlPatterns = ["/twitterAPIServlet"])
class TwitterAPIServlet : HttpServlet() {
#Throws(IOException::class)
override fun doGet(req: HttpServletRequest, resp: HttpServletResponse) {
// Print answer
val out = resp.writer
out.println("Request Done : </br>")
}
}
When i am trying to call this with my .jsp page, i have this error :
2020-05-10 15:30:34.218:WARN:oejs.HttpChannel:qtp60559178-27: /twitterAPIServlet
java.lang.NoClassDefFoundError: kotlin/jvm/internal/Intrinsics
at main.java.co.rezo.api.internal.v1.TwitterAPIServlet.doGet(TwitterAPIServlet.kt)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
When i am trying the same code in Java, it's working :
#WebServlet(
name = "TwitterAPIServlet",
description = "This is used to test the servlet api",
urlPatterns = "/twitterAPIServlet")
public class TwitterAPIServlet extends HttpServlet {
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
PrintWriter out = resp.getWriter();
out.println("Request Done : </br>");
}
}
What can i do to make my Kotlin code working?
Most probably the issue is that Kotlin's standard library is not included in the generated WAR (or is not on a classpath if you run the exploded app). Make sure to include it in your build.
Instructions for Gradle can be found in the official examples repository: kotlin-examples.
Maven is similar: https://kotlinlang.org/docs/reference/using-maven.html.
In case of pure IDEA (though it's recommended to use one of the build tools above), check the projects settings:
You should see Kotlin's stdlib included in the artifact:

java.lang.UnsupportedOperationException: Packages and file facades are not yet supported in Kotlin reflection

When starting a basic Ktor app, I get:
Exception in thread "main" java.lang.UnsupportedOperationException: Packages and file facades are not yet supported in Kotlin reflection. Meanwhile please use Java reflection to inspect this class: class com.example.ApplicationKt
at kotlin.reflect.jvm.internal.KClassImpl.reportUnresolvedClass(KClassImpl.kt:301)
at kotlin.reflect.jvm.internal.KClassImpl.access$reportUnresolvedClass(KClassImpl.kt:43)
at kotlin.reflect.jvm.internal.KClassImpl$Data$descriptor$2.invoke(KClassImpl.kt:53)
at kotlin.reflect.jvm.internal.KClassImpl$Data$descriptor$2.invoke(KClassImpl.kt:44)
at kotlin.reflect.jvm.internal.ReflectProperties$LazySoftVal.invoke(ReflectProperties.java:92)
at kotlin.reflect.jvm.internal.ReflectProperties$Val.getValue(ReflectProperties.java:31)
at kotlin.reflect.jvm.internal.KClassImpl$Data.getDescriptor(KClassImpl.kt)
at kotlin.reflect.jvm.internal.KClassImpl$Data$objectInstance$2.invoke(KClassImpl.kt:106)
at kotlin.reflect.jvm.internal.ReflectProperties$LazyVal.invoke(ReflectProperties.java:62)
at kotlin.reflect.jvm.internal.ReflectProperties$Val.getValue(ReflectProperties.java:31)
at kotlin.reflect.jvm.internal.KClassImpl$Data.getObjectInstance(KClassImpl.kt)
at kotlin.reflect.jvm.internal.KClassImpl.getObjectInstance(KClassImpl.kt:239)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createModuleContainer(ApplicationEngineEnvironmentReloading.kt:328)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.executeModuleFunction(ApplicationEngineEnvironmentReloading.kt:317)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:275)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:127)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:247)
at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:106)
at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:18)
at io.ktor.server.engine.ApplicationEngine$DefaultImpls.start$default(ApplicationEngine.kt:52)
at io.ktor.server.netty.EngineMain.main(EngineMain.kt:17)
at com.example.ApplicationKt.main(Application.kt:10)
The app is just:
fun main(args: Array<String>): Unit = EngineMain.main(args)
fun Application.demoModule() {
routing {
get("/") {
call.respondText("Hello ${call.parameters["name"]}")
}
}
}
I just noticed the file resources.application.conf had an issue.
It had the wrong module name. I changed com.example.ApplicationKt.module to com.example.ApplicationKt.demoModule:
ktor {
deployment {
port = 8080
port = ${?PORT}
}
application {
modules = [ com.example.ApplicationKt.demoModule ]
}
}
What's annoying is that the error help says nothing about it.

Quarkus Vert.x Example

I want to test Quarkus and the native image for Docker with an existing project written in Kotlin and using Vert.x verticles.
Can you point me to an example on how to deploy verticles using Quarkus?
My dependencies are vertx-sockjs-service-proxy and vertx-lang-kotlin.
I found some examples in the Vert.x extension tests but I cannot find how to deploy my verticles at server startup.
#Inject
EventBus eventBus;
#Route(path = "/hello-event-bus", methods = GET)
void helloEventBus (RoutingExchange exchange){
eventBus.send("hello", exchange.getParam("name").orElse("missing"), ar -> {
if (ar.succeeded()) {
exchange.ok(ar.result().body().toString());
} else {
exchange.serverError().end(ar.cause().getMessage());
}
});
}
You can use verticle as follows:
#Inject Vertx vertx;
void onStart(#Observes StartupEvent ev) {
vertx.deploy(new MyVerticleA());
vertx.deploy(new MyVerticleB());
}

Realm throws exception with empty unit test

In an Objective-C project, we started writing our new Unit Tests in Swift. I'm just now trying to create our first Unit Test of successfully saving the results of a parsed JSON. However, the test already fails during setup() due to the following error:
[ProjectTests.Project testInitializingOverlayCollectionCreatesAppropriateRealmObjects] : failed: caught "NSInvalidArgumentException", "+[RLMObjectBase ignoredProperties]: unrecognized selector sent to class 0x759b70
So apparently it tries to execute ignoredProperties on the RLMObjectBase class, and that method isn't implemented yet. Not sure how this happens, because I have yet to initialise anything, beyond creating a RLMRealms object with a random in-memory identifier.
ProjectTests.swift
import XCTest
class ProjectOverlayCollectionTests: XCTestCase {
var realm: RLMRealm!
override func setUp() {
super.setUp()
// Put setup code here. This method is called before the invocation of each test method in the class.
let realmConfig = RLMRealmConfiguration()
realmConfig.inMemoryIdentifier = NSUUID().UUIDString
do {
realm = try RLMRealm(configuration: realmConfig) // <-- Crashes here.
}
catch _ as NSError {
XCTFail()
}
}
override func tearDown() {
// Put teardown code here. This method is called after the invocation of each test method in the class.
super.tearDown()
}
func testInitializingOverlayCollectionCreatesAppropriateRealmObjects() {
XCTAssertTrue(true)
}
}
Project-Bridging-Header.h
#import <Realm/Realm.h>
Podfile
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '7.1'
def shared_pods
pod 'Realm', '0.95.0'
end
target 'Project' do
shared_pods
end
target 'ProjectTests' do
shared_pods
end
As mentioned in the Realm documentation;
Avoid Linking Realm and Tested Code in Test Target
Remove the Realm pod from the ProjectTests target and all is right with the world.
Update: This answer is outdated. As #rommex mentions in a comment, following the current Realm installation documentation should link it to both your module and test targets without problems. However, I have not checked this.

No source available when debuggin ninject

I have same the problem as here No Source Available Error With Ninject When Debugging Code
Checking "Tools/Options/Debug/Just my code" makes absolutely no difference at all.
The error appears when debugger steps out from class below:
class TestModule : Ninject.Modules.NinjectModule {
public override void Load() {
Bind<IWeapon>().To<Sword>();
Bind<IWeapon>().To<Dagger>();
}
}
I installed Ninject yesterday using 'Add library package reference' in VS2010