I'd like to inject beans a Kotlin field in Quarkus. The sample file looks like
package org.example
import com.google.inject.Inject
import javax.enterprise.inject.spi.BeanManager
import javax.ws.rs.GET
import javax.ws.rs.Path
#Path("injectDemo")
open class InjectDemo #Inject constructor(val bm1: BeanManager) {
#field:Inject
protected open lateinit var bm2: BeanManager
#GET
fun demo() {
println("bm1 $bm1")
println("bm2 $bm2")
}
}
The constructor parameter injection works fine however field bm2 remains uninitialized.
Console output:
bm1 io.quarkus.arc.impl.BeanManagerImpl#6b7ac97f
2020-05-21 03:45:11,670 ERROR [io.qua.ver.htt.run.QuarkusErrorHandler] (executor-thread-1) HTTP Request to /injectDemo failed, error id: ac118d6b-a26e-47e7-8c10-12e6a96e50ba-3: org.jboss.resteasy.spi.UnhandledException: kotlin.UninitializedPropertyAccessException: lateinit property bm2 has not been initialized
at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:106)
at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:372)
at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:216)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:515)
at org.jboss.resteasy.core.SynchronousDispatcher.lambda$invoke$4(SynchronousDispatcher.java:259)
at org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess$0(SynchronousDispatcher.java:160)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:362)
at org.jboss.resteasy.core.SynchronousDispatcher.preprocess(SynchronousDispatcher.java:163)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:245)
at io.quarkus.resteasy.runtime.standalone.RequestDispatcher.service(RequestDispatcher.java:73)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.dispatch(VertxRequestHandler.java:123)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.access$000(VertxRequestHandler.java:36)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler$1.run(VertxRequestHandler.java:87)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2046)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1578)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1452)
at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
at java.base/java.lang.Thread.run(Thread.java:832)
at org.jboss.threads.JBossThread.run(JBossThread.java:479)
Caused by: kotlin.UninitializedPropertyAccessException: lateinit property bm2 has not been initialized
at org.example.InjectDemo.getBm2(InjectDemo.kt:12)
at org.example.InjectDemo.demo(InjectDemo.kt:17)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:130)
at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:621)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:487)
at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$2(ResourceMethodInvoker.java:437)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:362)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:439)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:400)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:374)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:67)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:488)
... 17 more
Is it possible possible to use CDI field injection in Quarkus in Kotlin? If yes, what needs to be set up for injection to work?
I'm running the app from an uberjar, not a native image.
The jar contains generated class org.example.InjectDemo_Bean containing a method create() disassembled version of which doesn't show any attempt of inject into bm2 field:
public InjectDemo create(CreationalContext var1) {
Object var2 = this.injectProviderSupplier1.get();
CreationalContextImpl var3 = CreationalContextImpl.child((InjectableReferenceProvider)var2, var1);
Object var4 = ((InjectableReferenceProvider)var2).get((CreationalContext)var3);
return new InjectDemo((BeanManager)var4);
}
According to https://quarkus.io/guides/kotlin#cdi-inject-with-kotlin Kotlin annotation reflection miss Target annotation which caused injection to fail. The solution is to add field javax.enterprise.inject.Default annotation:
#field:Default
#field:Inject
protected open lateinit var bm2: BeanManager
Related
I'm trying to get ahold of a ResourceLoader for a utility method by using injections, but I keep getting the following error:
Caused by: kotlin.UninitializedPropertyAccessException: lateinit property resourceResolver has not been initialized
#Singleton
class Injections {
#Inject
lateinit var resourceResolver: ResourceLoader
}
val inj = Injections()
fun <T> parseYaml(filePath: String): T {
if (!inj.resourceResolver.getResource(filePath).isPresent) {
throw IllegalArgumentException("Could not find file '$filePath'")
}
val inputStream = inj.resourceResolver.getResourceAsStream(filePath).get()
return Yaml().load(inputStream) as T
}
I don't need to be using injections to make this happen, I just need to access a ResourceResolver from the parseYaml method.
I don't need to be using injections to make this happen
You kind of do need to be using injections. That is why your code makes use of #Inject.
The problem is you are creating a new instance of Injections instead of using the one provided by the container, so your instance won't be initialized the way you want it to be. Instead of val inj = Injections() if you #Inject the Injections instance into whatever bean(s) need access to it, that will work.
I tried to solve the following problem by providing Kryo Serializer but it still doesn't work. It could not recognize the serializer of ModelCom. Also, any messages by print function don't show up.
I used Apache Flink 1.9.0 and Apache Jena 3.10.0
My code in Kotlin:
val serializer = object : Serializer<Model>(){
override fun write(kryo: Kryo, output: Output?, obj : Model?) {
print("write")
kryo.writeClassAndObject(output, obj)
}
override fun read(kryo: Kryo, input: Input?, type: Class<Model>?): Model {
print("read")
val m = kryo.readObject(input, Model::class.java)
return m
}
}
ExecutionContext.see.config.registerTypeWithKryoSerializer(ModelCom::class.java, serializer::class.java)
Error
Exception in thread "main" org.apache.flink.streaming.runtime.tasks.StreamTaskException: Cannot serialize operator object class org.apache.flink.streaming.api.operators.SimpleUdfStreamOperatorFactory.
at org.apache.flink.streaming.api.graph.StreamConfig.setStreamOperatorFactory(StreamConfig.java:222)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.setVertexConfig(StreamingJobGraphGenerator.java:460)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:272)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:243)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createChain(StreamingJobGraphGenerator.java:243)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.setChaining(StreamingJobGraphGenerator.java:207)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createJobGraph(StreamingJobGraphGenerator.java:159)
at org.apache.flink.streaming.api.graph.StreamingJobGraphGenerator.createJobGraph(StreamingJobGraphGenerator.java:94)
at org.apache.flink.streaming.api.graph.StreamGraph.getJobGraph(StreamGraph.java:737)
at org.apache.flink.optimizer.plan.StreamingPlan.getJobGraph(StreamingPlan.java:40)
at org.apache.flink.streaming.api.environment.LocalStreamEnvironment.execute(LocalStreamEnvironment.java:86)
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1507)
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1489)
at core.EgressEngine.start(EgressEngine.kt:187)
at core.EgressEngineKt.main(EgressEngine.kt:45)
Caused by: java.io.NotSerializableException: org.apache.jena.rdf.model.impl.ModelCom
at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1185)
at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at java.base/java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1553)
at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1510)
at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1433)
at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1179)
at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:349)
at org.apache.flink.util.InstantiationUtil.serializeObject(InstantiationUtil.java:586)
at org.apache.flink.util.InstantiationUtil.writeObjectToConfig(InstantiationUtil.java:515)
at org.apache.flink.streaming.api.graph.StreamConfig.setStreamOperatorFactory(StreamConfig.java:219)
... 14 more
Jena models are not serializable, so this approach isn't going to work. What you could do instead would be to send around just enough serialized data so that each instance that needs a model can instantiate one.
See this thread from the jena-users list about how to resolve this for Spark; the underlying issues are the same for any JVM-based framework that distributes computation.
I want to have my Dagger 2 inject the below class and doesn't plan to use #Module to do so.
So I put #Inejct constructor as below
class InjectClass #Inject constructor(var txt: String = "Default")
It doesn't work as it complaints
e: [kapt] An exception occurred: java.lang.IllegalStateException: Found multiple
#Inject constructors: [InjectClass(java.lang.String), InjectClass()]
Is there a way to make it work here?
Instead of using a default value, you could write a secondary constructor instead:
class InjectClass #Inject constructor(var txt: String) {
constructor(): this("Default")
}
Like this you make sure that the default constructor is not annotated with #Inject and Dagger knows how to create InjectClass.
Optionally, we could do this
class InjectClass(var txt: String) {
#Inject constructor(): this("Default")
}
I'm trying to learn how to implement Retrofit2 and Moshi inside the Kotlin programming language. However, I seem to be having trouble trying to compile my code.
I define the following data classes/models which map to the json response I receive from the api I am hitting:
#JsonClass(generateAdapter = true)
data class Catalogs(
val languages: List<LanguageCatalog>
)
#JsonClass(generateAdapter = true)
data class LanguageCatalog(
val direction: String,
val identifier: String,
val title: String,
val resources: List<ResourceCatalog>
)
#JsonClass(generateAdapter = true)
data class Project(
val identifier: String,
val sort: Int,
val title: String,
val versification: String?
)
#JsonClass(generateAdapter = true)
data class ResourceCatalog(
val identifier: String,
val modified: String,
val projects: List<Project>,
val title: String,
val version: String
)
Then I have an interface which defines the behavior for the API:
interface Door43Service
{
#GET("v3/catalog.json")
fun getFormat() : Observable<Catalogs>
companion object
{
fun create(): Door43Service
{
val retrofit = Retrofit.Builder()
.addCallAdapterFactory(
RxJava2CallAdapterFactory.create()
)
.addConverterFactory(
MoshiConverterFactory.create()
)
.baseUrl("https://api.door32.org/")
.build()
return retrofit.create(Door43Service::class.java)
}
}
}
Lastly, I implemented everything inside a main function to get the json data from the api:
val door43Service by lazy {
Door43Service.create()
}
var disposable: Disposable? = null
fun main(args: Array<String>)
{
door43Service.getFormat()
.subscribe(
{ result -> println(result.languages)},
{ error -> println(error.message)}
)
}
The data that gets returned from the api is pretty long, but an example of it can be found at http://api-info.readthedocs.io/en/latest/door43.html
My issue is I am getting the following error in my stack:
Exception in thread "main" java.lang.IllegalArgumentException: Unable to create converter for class model.Catalogs
for method Door43Service.getFormat
at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:755)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:741)
at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:172)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170)
at retrofit2.Retrofit$1.invoke(Retrofit.java:147)
at com.sun.proxy.$Proxy0.getFormat(Unknown Source)
at MainKt.main(main.kt:11)
Caused by: java.lang.RuntimeException: Failed to find the generated JsonAdapter class for class model.Catalogs
at com.squareup.moshi.StandardJsonAdapters.generatedAdapter(StandardJsonAdapters.java:249)
at com.squareup.moshi.StandardJsonAdapters$1.create(StandardJsonAdapters.java:62)
at com.squareup.moshi.Moshi.adapter(Moshi.java:130)
at retrofit2.converter.moshi.MoshiConverterFactory.responseBodyConverter(MoshiConverterFactory.java:91)
at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:330)
at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:313)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:739)
... 5 more
Caused by: java.lang.ClassNotFoundException: model.CatalogsJsonAdapter
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.squareup.moshi.StandardJsonAdapters.generatedAdapter(StandardJsonAdapters.java:236)
At first glance, my understanding is that the compiler thinks I haven't defined an adapter for my Catalogs class, but I think that's supposed to be covered using the #JsonClass(generateradapter = true) annotation. Is there anything I'm missing? Why can't my program generate the adapter for my Catalogs class?
So I got things working. All I had to do was rebuild the project by running gradle build in the terminal (I was originally running it in IntelliJ, but that didn't seem to actually run the build). The key issue was since the build wasn't running, the line in my gradle build script that says,
kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshi_version"
wasn't running. This line basically gives the compiler to understand annotations in the code like #JsonClass. Without this line, the compiler won't understand the annotation. This was the root cause of my issue. I am keeping this post up in case anyone runs into the same issue.
I need something that can make my class nullable/optional because of the runtime errors that is happening on some devices.
Is this possible?
class MyFragment extends Fragment {
#Inject
var presenter: MyPresenter? = null
// Other codes here...
}
I wanted to use the presenter as an option because SOME of the old Android devices especially are throwing this error (this is before I removed the lazyinit).
Code:
class MyFragment extends Fragment {
#Inject
lazyinit var presenter: MyPresenter? = null
// Other codes here...
override fun onDestroy() {
super.onDestroy()
presenter.somecode()
}
}
Error:
Fatal Exception: java.lang.RuntimeException: Unable to destroy activity {com.sample.MyActivity}: c.r: lateinit property presenter has not been initialized
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3497)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(NativeStart.java)
Caused by c.r: lateinit property presenter has not been initialized
at com.sample.MyFragment.onDestroy(SourceFile:459)
at android.support.v4.app.Fragment.performDestroy(SourceFile:2434)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1442)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(SourceFile:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1595)
at android.support.v4.app.FragmentManagerImpl.dispatchDestroy(SourceFile:2951)
at android.support.v4.app.FragmentController.dispatchDestroy(SourceFile:271)
at android.support.v4.app.FragmentActivity.onDestroy(SourceFile:390)
at android.support.v7.app.AppCompatActivity.onDestroy(SourceFile:209)
at android.app.Activity.performDestroy(Activity.java:5403)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1117)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3484)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(NativeStart.java)
Is there are way or workaround for this situation?
I had the same problem and solved like this:
#Inject
#JvmField
var presenter: Presenter? = null
Hope it helps.
If you don't have Java code that needs to access the presenter field you don't need to annotate it with #JvmField. Instead, you can declare your field like so:
#set:Inject
var presenter: Presenter? = null