如何在 Kotlin 的 Quarkus 中使用 CDI 字段注入？

Question

我想将 bean 注入 Quarkus 中的 Kotlin 字段。样本文件看起来像

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")
    }
}

构造函数参数注入工作正常，但字段 bm2 仍未初始化。

控制台输出：

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$invoke(SynchronousDispatcher.java:259)
    at org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess[=11=](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[=11=]0(VertxRequestHandler.java:36)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.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(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

是否可以在 Kotlin 的 Quarkus 中使用 CDI 字段注入？如果是，需要设置什么才能使注入工作？

我是运行来自 uberjar 的应用程序，而不是本地图像。

该 jar 包含生成的 class org.example.InjectDemo_Bean 包含一个方法 create() 反汇编版本未显示任何注入到 bm2 字段的尝试：

    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);
    }

Answer 1

根据https://quarkus.io/guides/kotlin#cdi-inject-with-kotlin Kotlin注解反射遗漏Target注解导致注入失败。解决方法是在字段中添加javax.enterprise.inject.Default注解：

    @field:Default
    @field:Inject
    protected open lateinit var bm2: BeanManager

如何在 Kotlin 的 Quarkus 中使用 CDI 字段注入？

How to use CDI field injection in Quarkus in Kotlin?

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