Micronaut: @Introspected with @AccessorsStyle demo

Sometimes you might have accessor methods that do not follow bean naming conventions. In that case, you can use readPrefixes, writePrefixes property of @AccessorsStyle annotation to convey the accessor method prefixes.

 

For example, 

@Introspected
@AccessorsStyle(readPrefixes = { "read" }, writePrefixes = { "write" })
public class Person {

	private Integer id;

	private String name;

	public Person(Integer id, String name) {
		this.id = id;
		this.name = name;
	}

	public Integer readId() {
		return id;
	}

	public void writeId(Integer id) {
		this.id = id;
	}

	public String readName() {
		return name;
	}

	public void writeName(String name) {
		this.name = name;
	}

}

In the above example, accessor methods starts with read and write prefixes, same is conveyed to Micronaut using @AccessorsStyle annotation.

 

Find the below working application.

 

Step 1: Create new maven project ‘micronaut-bean-introspection-accessor-style’.

 

Step 2: Update pom.xml with maven dependencies.

 

pom.xml

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.sample.app</groupId>
	<artifactId>micronaut-bean-introspection-accessor-style</artifactId>
	<version>1</version>

	<properties>
		<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
		<micronaut.version>3.7.2</micronaut.version>
		<slf4j.version>2.0.3</slf4j.version>

		<maven.compiler.target>15</maven.compiler.target>
		<maven.compiler.source>15</maven.compiler.source>
	</properties>

	<dependencies>

		<dependency>
			<groupId>io.micronaut</groupId>
			<artifactId>micronaut-inject-java</artifactId>
			<version>${micronaut.version}</version>
		</dependency>
		<dependency>
			<groupId>io.micronaut</groupId>
			<artifactId>micronaut-runtime</artifactId>
			<version>${micronaut.version}</version>
		</dependency>


		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>${slf4j.version}</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-simple</artifactId>
			<version>${slf4j.version}</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>

			<plugin>
				<artifactId>maven-assembly-plugin</artifactId>
				<configuration>
					<archive>
						<manifest>
							<mainClass>com.sample.app.App</mainClass>
						</manifest>
					</archive>
					<descriptorRefs>
						<descriptorRef>jar-with-dependencies</descriptorRef>
					</descriptorRefs>
				</configuration>

				<executions>
					<execution>
						<id>make-assembly</id>
						<phase>package</phase>
						<goals>
							<goal>single</goal>
						</goals>
					</execution>
				</executions>
			</plugin>

		</plugins>
	</build>
</project>

Step 3: Define Person model class.

 

Person.java

package com.sample.app.model;

import io.micronaut.core.annotation.AccessorsStyle;
import io.micronaut.core.annotation.Introspected;

@Introspected
@AccessorsStyle(readPrefixes = { "read" }, writePrefixes = { "write" })
public class Person {

	private Integer id;

	private String name;

	public Person(Integer id, String name) {
		this.id = id;
		this.name = name;
	}

	public Integer readId() {
		return id;
	}

	public void writeId(Integer id) {
		this.id = id;
	}

	public String readName() {
		return name;
	}

	public void writeName(String name) {
		this.name = name;
	}

}

Step 4: Define main application class.

 

App.java

package com.sample.app;

import com.sample.app.model.Person;

import io.micronaut.context.ApplicationContext;
import io.micronaut.core.beans.BeanIntrospection;
import io.micronaut.core.beans.BeanProperty;

public class App {

	public static void main(String[] args) {
		try (ApplicationContext applicationContext = ApplicationContext.run()) {
			final BeanIntrospection<Person> introspection = BeanIntrospection.getIntrospection(Person.class);
			Person person = introspection.instantiate(1, "Krishna");
			
			System.out.println("id : " + person.readId());
			System.out.println("name : " + person.readName());

			final BeanProperty<Person, String> property = introspection.getRequiredProperty("name", String.class); 
			property.set(person, "Ram"); //
			String name = property.get(person);
		
			System.out.println("\nname : " + name);	
			System.out.println("id : " + person.readId());
			System.out.println("name : " + person.readName());

		}

	}
}

Total project structure looks like below.

Build the project using mvn package command.

Navigate to the folder where pom.xml is located and execute the command ‘mvn package’.

 

Upon command successful execution, you can see the jar file ‘micronaut-bean-introspection-accessor-style-1-jar-with-dependencies.jar’ in project target folder.

$ls ./target/
archive-tmp
classes
generated-sources
maven-archiver
maven-status
micronaut-bean-introspection-accessor-style-1-jar-with-dependencies.jar
micronaut-bean-introspection-accessor-style-1.jar
test-classes

Execute below command to run the application.

$java -jar ./target/micronaut-bean-introspection-accessor-style-1-jar-with-dependencies.jar
id : 1
name : Krishna

name : Ram
id : 1
name : Ram

You can download this application from this link.

 

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