In Spring Boot, we have ApplicationContextAware interface, providing a way to set ApplicationContext, which is then used to inject some beans (that can only be initiated by the programme) into the 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);
}
}
I was trying to find such a method in Micronaut framework. I looked into documentation and tried a few classes like ApplicationContextConfigurer, ApplicationContextBuilder etc. but none seemed to work
By looking at what the code above does, is there a way to achieve the same thing in Micronaut?
More background:
I deployed a Micronaut application onto AWS Lambda and got NullPointerException. I referred to this post, which mentioned ApplicationContextAware. This post uses Spring, but I suspect the underlysing mechanism should be similar
Posting my pom.xml, as asked by the comments
<?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>
In Micronaut you don't need such an interface. If any Micronaut managed bean accepts the ApplicationContext as a constructor parameter, or includes a property marked with @Inject, the ApplicationContext will be injected.
Ex:
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() {
// ...
}
}