Micronaut 等效於 Spring ApplicationContextAware

Question

在 Spring Boot 中，我們有ApplicationContextAware接口，提供了一種設置ApplicationContext的方法，然后用於將一些 bean（只能由程序啟動）注入 class

// this is a Spring Boot programme
package com.example.demo

import org.springframework.context.ApplicationContextAware;

public class MyClass implements ApplicationContextAware {

    private MyBean myBean;
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        this.applicationContext= applicationContext;
    }

    public void setBean(){
       this.myBean= applicationContext.getBean(MyBean.class);
    }
}

我試圖在Micronaut框架中找到這樣的方法。 我查看了文檔並嘗試了一些類，例如ApplicationContextConfigurer 、 ApplicationContextBuilder等，但似乎都沒有用

通過查看上面的代碼，有沒有辦法在 Micronaut 中實現同樣的事情？

---

更多背景：

我將一個 Micronaut 應用程序部署到 AWS Lambda 上並得到了 NullPointerException。 我參考了這篇文章，其中提到了 ApplicationContextAware。 這篇文章使用Spring，但我懷疑底層機制應該是類似的

---

按照評論的要求發布我的 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>MicronautExp</artifactId>
  <version>0.1</version>
  <packaging>${packaging}</packaging>

  <parent>
    <groupId>io.micronaut</groupId>
    <artifactId>micronaut-parent</artifactId>
    <version>3.7.4</version>
  </parent>

  <properties>
    <packaging>jar</packaging>
    <jdk.version>11</jdk.version>
    <release.version>11</release.version>
    <micronaut.version>3.7.4</micronaut.version>
    <micronaut.runtime>netty</micronaut.runtime>
    <micronaut.runtime>lambda</micronaut.runtime>
    <exec.mainClass>com.example.Application</exec.mainClass>
    <exec.mainClass>io.micronaut.function.aws.runtime.MicronautLambdaRuntime</exec.mainClass>
  </properties>

  <repositories>
    <repository>
      <id>central</id>
      <url>https://repo.maven.apache.org/maven2</url>
    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>io.micronaut</groupId>
      <artifactId>micronaut-inject</artifactId>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>io.micronaut</groupId>
      <artifactId>micronaut-validation</artifactId>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>io.micronaut</groupId>
      <artifactId>micronaut-jackson-databind</artifactId>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>jakarta.annotation</groupId>
      <artifactId>jakarta.annotation-api</artifactId>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>io.micronaut.test</groupId>
      <artifactId>micronaut-test-junit5</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-api</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-engine</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.24</version>
    </dependency>
    <dependency>
      <groupId>com.googlecode.json-simple</groupId>
      <artifactId>json-simple</artifactId>
      <version>1.1.1</version>
    </dependency>

<!--    micronaut http dependencies. Forgot why they are here, but better not touch it-->
    <dependency>
      <groupId>io.micronaut</groupId>
      <artifactId>micronaut-http-client</artifactId>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>io.micronaut</groupId>
      <artifactId>micronaut-http-server-netty</artifactId>
      <scope>compile</scope>
    </dependency>

<!--    graalvm compilers. Forgot why they are here, but better not touch it-->
    <dependency>
      <groupId>org.graalvm.nativeimage</groupId>
      <artifactId>svm</artifactId>
      <version>22.2.0</version>
    </dependency>
    <dependency>
      <groupId>org.graalvm.sdk</groupId>
      <artifactId>graal-sdk</artifactId>
      <version>22.2.0</version>
    </dependency>

<!--    micronaut email dependency-->
    <dependency>
      <groupId>io.micronaut.email</groupId>
      <artifactId>micronaut-email-javamail</artifactId>
    </dependency>
    <dependency>
      <groupId>io.micronaut.email</groupId>
      <artifactId>micronaut-email</artifactId>
      <version>1.5.0</version>
    </dependency>

<!--    AWS Lambda dependencies-->
    <dependency>
      <groupId>com.amazonaws</groupId>
      <artifactId>aws-lambda-java-core</artifactId>
      <version>1.2.2</version>
    </dependency>
    <dependency>
      <groupId>io.micronaut.aws</groupId>
      <artifactId>micronaut-function-aws-api-proxy</artifactId>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>io.micronaut.aws</groupId>
      <artifactId>micronaut-function-aws-api-proxy-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>io.micronaut.aws</groupId>
      <artifactId>micronaut-function-aws-custom-runtime</artifactId>
      <scope>compile</scope>
    </dependency>

    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.12.0</version>
    </dependency>

  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>io.micronaut.build</groupId>
        <artifactId>micronaut-maven-plugin</artifactId>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.10.1</version>
        <configuration>
          <!-- Uncomment to enable incremental compilation -->
          <!-- <useIncrementalCompilation>false</useIncrementalCompilation> -->

          <annotationProcessorPaths combine.children="append">
            <path>
              <groupId>io.micronaut</groupId>
              <artifactId>micronaut-http-validation</artifactId>
              <version>${micronaut.version}</version>
            </path>
          </annotationProcessorPaths>
          <compilerArgs>
            <arg>-Amicronaut.processing.group=com.example</arg>
            <arg>-Amicronaut.processing.module=MicronautExp</arg>
          </compilerArgs>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.4.3</version>
        <configuration>
          <createDependencyReducedPom>false</createDependencyReducedPom>
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>

Answer 1

在 Micronaut 中，您不需要這樣的界面。 如果任何 Micronaut 托管 bean 接受ApplicationContext作為構造函數參數，或包含標有@Inject的屬性，則ApplicationContext將被注入。

前任：

import io.micronaut.context.ApplicationContext;
import io.micronaut.http.annotation.*;

@Controller("/demo")
public class DemoController {

    private final ApplicationContext applicationContext;

    public DemoController(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    @Get(uri="/", produces="text/plain")
    public String index() {
        // ...
    }
}