Create and Connect a Micronaut Application to an Oracle Database on Amazon Relational Database Service

This guide describes how to create a database application using the Graal Development Kit for Micronaut (GDK). The application presents REST endpoints and stores data in an Oracle Database running on Amazon Relational Database Service (RDS) using Micronaut^® Data.

Micronaut Data is a database access toolkit that uses ahead-of-time compilation to precompute queries for repository interfaces that are then executed by a thin, lightweight runtime layer. Micronaut Data supports the following back ends: JPA (Hibernate and Hibernate Reactive); SQL (JDBC, R2DBC); and MongoDB.

Prerequisites #

JDK 17 or higher. See Setting up Your Desktop.
An Amazon Web Services (AWS) account with enough user permissions to create and manage DB instances in RDS. See Setting up Your Cloud Accounts.
The AWS CLI. Follow the AWS documentation for installing or updating the latest version of the AWS CLI.
SQLPlus CLI. See Oracle Instant Client download page for installation instructions.

Follow the steps below to create the application from scratch. However, you can also download the completed example:

Gradle
Maven

Gradle AWS Database Example Download completed example

Maven AWS Database Example Download completed example

A note regarding your development environment

Consider using Visual Studio Code, which provides native support for developing applications with the Graal Development Kit extension.

Note: If you use IntelliJ IDEA, enable annotation processing.

Windows platform: The GDK guides are compatible with Gradle only. Maven support is coming soon.

1. Create the Application #

Create an application using the GDK Launcher.

Open the GDK Launcher in advanced mode.
Create a new project using the following selections.
- Project Type: Application (Default)
- Project Name: aws-oracledb-demo
- Base Package: com.example (Default)
- Clouds: AWS
- Language: Java (Default)
- Build Tool: Gradle (Groovy) or Maven
- Test Framework: JUnit (Default)
- Java Version: 17 (Default)
- Micronaut Version: (Default)
- Cloud Services: Database
- Features: GraalVM Native Image and Oracle Database Server
- Sample Code: Yes (Default)
Click Generate Project, then click Download Zip. The GDK Launcher creates an application with the default package com.example in a directory named aws-oracledb-demo. The application ZIP file will be downloaded to your default downloads directory. Unzip it, open it in your code editor, and proceed to the next steps.

Alternatively, use the GDK CLI as follows:

Gradle
Maven

gdk create-app com.example.aws-oracledb-demo \
    --clouds=aws \
    --services=database \
    --features=graalvm,oracle \
    --build=gradle \
    --jdk=17 \
    --lang=java

gdk create-app com.example.aws-oracledb-demo \
    --clouds=aws \
    --services=database \
    --features=graalvm,oracle \
    --build=maven \
    --jdk=17 \
    --lang=java

1.1. Domain Entity #

The GDK Launcher created the sample domain entity in the lib/src/main/java/com/example/domain/Genre.java file:

package com.example.domain;

import io.micronaut.data.annotation.GeneratedValue;
import io.micronaut.data.annotation.Id;
import io.micronaut.data.annotation.MappedEntity;
import io.micronaut.serde.annotation.Serdeable;

import jakarta.validation.constraints.NotNull;

@Serdeable
@MappedEntity
public class Genre {

    @Id
    @GeneratedValue
    private Long id;

    @NotNull
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "Genre{" + "id=" + id + ", name='" + name + "'}";
    }
}

1.2. Repository Interface #

A repository interface defines the operations to access the database. Micronaut Data implements the interface at compilation time. A sample repository interface was created for you in lib/src/main/java/com/example/repository/GenreRepository.java:

package com.example.repository;

import com.example.domain.Genre;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.annotation.Id;
import io.micronaut.data.jdbc.annotation.JdbcRepository;
import io.micronaut.data.repository.PageableRepository;

import jakarta.validation.constraints.NotBlank;

import static io.micronaut.data.model.query.builder.sql.Dialect.ORACLE;

@JdbcRepository(dialect = ORACLE) // <1>
public interface GenreRepository extends PageableRepository<Genre, Long> { // <2>

    Genre save(@NonNull @NotBlank String name);

    long update(@Id long id, @NonNull @NotBlank String name);
}

1 @JdbcRepository with a specific dialect.

2 Genre, the entity to treat as the root entity for the purposes of querying, is established either from the method signature or from the generic type parameter specified to the GenericRepository interface.

The repository extends from PageableRepository. It inherits the hierarchy PageableRepository → CrudRepository → GenericRepository.

Repository	Description
`PageableRepository`	A repository that supports pagination. It provides `findAll(Pageable)` and `findAll(Sort)`.
`CrudRepository`	A repository interface for performing CRUD (Create, Read, Update, Delete). It provides methods such as `findAll()`, `save(Genre)`, `deleteById(Long)`, and `findById(Long)`.
`GenericRepository`	A root interface that features no methods but defines the entity type and ID type as generic arguments.

1.3. Controller #

Hibernate Validator is a reference implementation of the Validation API. Micronaut has built-in support for validation of beans that use jakarta.validation annotations. The necessary dependencies are included by default when creating a project.

The GDK Launcher created the main controller that exposes a resource with the common CRUD operations for you in lib/src/main/java/com/example/controller/GenreController.java:

package com.example.controller;

import com.example.domain.Genre;
import com.example.service.GenreService;
import io.micronaut.data.model.Pageable;
import io.micronaut.http.HttpResponse;
import io.micronaut.http.annotation.Body;
import io.micronaut.http.annotation.Controller;
import io.micronaut.http.annotation.Delete;
import io.micronaut.http.annotation.Get;
import io.micronaut.http.annotation.Post;
import io.micronaut.http.annotation.Put;
import io.micronaut.http.annotation.Status;
import io.micronaut.scheduling.TaskExecutors;
import io.micronaut.scheduling.annotation.ExecuteOn;

import jakarta.validation.Valid;
import jakarta.validation.constraints.NotBlank;
import java.net.URI;
import java.util.List;
import java.util.Optional;

import static io.micronaut.http.HttpHeaders.LOCATION;
import static io.micronaut.http.HttpStatus.NO_CONTENT;

@ExecuteOn(TaskExecutors.IO) // <1>
@Controller("/genres") // <2>
class GenreController {

    private final GenreService genreService;

    GenreController(GenreService genreService) { // <3>
        this.genreService = genreService;
    }

    @Get("/{id}") // <4>
    public Optional<Genre> show(Long id) {
        return genreService.findById(id);
    }

    @Put("/{id}/{name}") // <5>
    public HttpResponse<?> update(long id, String name) {
        genreService.update(id, name);
        return HttpResponse
                .noContent()
                .header(LOCATION, URI.create("/genres/" + id).getPath());
    }

    @Get("/list") // <6>
    public List<Genre> list(@Valid Pageable pageable) {
        return genreService.list(pageable);
    }

    @Post // <7>
    public HttpResponse<Genre> save(@Body("name") @NotBlank String name) {
        Genre genre = genreService.save(name);

        return HttpResponse
                .created(genre)
                .headers(headers -> headers.location(URI.create("/genres/" + genre.getId())));
    }

    @Delete("/{id}") // <8>
    @Status(NO_CONTENT)
    public void delete(Long id) {
        genreService.delete(id);
    }
}

1 It is critical that any blocking I/O operations (such as fetching the data from the database) are offloaded to a separate thread pool that does not block the event loop.

2 The class is defined as a controller with the @Controller annotation mapped to the path /genres.

3 Uses constructor injection to inject a bean of type GenreRepository.

4 Maps a GET request to /genres/{id}, which attempts to show a genre. This illustrates the use of a URL path variable (id).

5 Maps a PUT request to /genres/{id}/{name}, which attempts to update a genre. This illustrates the use of URL path variables (id and name).

6 Maps a GET request to /genres/list, which returns a list of genres. This mapping illustrates URL parameters being mapped to a single POJO.

7 Maps a POST request to /genres, which attempts to create a new genre.

8 Maps a DELETE request to /genres/{id}, which attempts to remove a genre. This illustrates the use of a URL path variable (id).

1.4. Service #

A service contains business logic and facilitates communication between the controller and the repository. The domain is used to communicate between the controller and service layers.

The GDK Launcher created a sample service class, lib/src/main/java/com/example/service/GenreService.java, for you:

package com.example.service;

import com.example.domain.Genre;
import com.example.repository.GenreRepository;
import io.micronaut.data.model.Pageable;
import jakarta.inject.Singleton;

import jakarta.transaction.Transactional;
import java.util.List;
import java.util.Optional;

@Singleton
public class GenreService {

    private final GenreRepository genreRepository;

    GenreService(GenreRepository genreRepository) {
        this.genreRepository = genreRepository;
    }

    public Optional<Genre> findById(Long id) {
        return genreRepository.findById(id);
    }

    @Transactional
    public long update(long id, String name) {
        return genreRepository.update(id, name);
    }

    public List<Genre> list(Pageable pageable) {
        return genreRepository.findAll(pageable).getContent();
    }

    @Transactional
    public Genre save(String name) {
        return genreRepository.save(name);
    }

    @Transactional
    public void delete(long id) {
        genreRepository.deleteById(id);
    }
}

1.5. Tests #

The GDK Launcher wrote tests for you, in aws/src/test/java/com/example/GenreControllerTest.java, to verify the CRUD operations:

package com.example;

import com.example.domain.Genre;
import com.example.repository.GenreRepository;
import io.micronaut.core.type.Argument;
import io.micronaut.context.env.Environment;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.HttpResponse;
import io.micronaut.http.client.HttpClient;
import io.micronaut.http.client.annotation.Client;
import io.micronaut.http.client.exceptions.HttpClientResponseException;
import io.micronaut.test.extensions.junit5.annotation.MicronautTest;
import jakarta.inject.Inject;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.Test;

import java.util.Collections;
import java.util.List;

import static io.micronaut.http.HttpHeaders.LOCATION;
import static io.micronaut.http.HttpStatus.CREATED;
import static io.micronaut.http.HttpStatus.NOT_FOUND;
import static io.micronaut.http.HttpStatus.NO_CONTENT;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;

@MicronautTest
class GenreControllerTest {

    @Inject
    @Client("/")
    HttpClient client;

    @Test
    void testFindNonExistingGenreReturns404() {
        HttpClientResponseException thrown = assertThrows(HttpClientResponseException.class, () -> {
            client.toBlocking().exchange(HttpRequest.GET("/genres/99999"));
        });

        assertNotNull(thrown.getResponse());
        assertEquals(NOT_FOUND, thrown.getStatus());
    }

    @Test
    void testGenreCrudOperations() {

        HttpResponse<?> response = client.toBlocking().exchange(
                HttpRequest.POST("/genres", Collections.singletonMap("name", "DevOps")));
        assertEquals(CREATED, response.getStatus());

        response = client.toBlocking().exchange(
                HttpRequest.POST("/genres", Collections.singletonMap("name", "Microservices")));
        assertEquals(CREATED, response.getStatus());

        Long id = entityId(response);

        Genre genre = client.toBlocking().retrieve(
                HttpRequest.GET("/genres/" + id), Genre.class);
        assertEquals("Microservices", genre.getName());

        response = client.toBlocking().exchange(
                HttpRequest.PUT("/genres/" + id + "/Micro-services", null));
        assertEquals(NO_CONTENT, response.getStatus());

        genre = client.toBlocking().retrieve(
                HttpRequest.GET("/genres/" + id), Genre.class);
        assertEquals("Micro-services", genre.getName());

        List<Genre> genres = client.toBlocking().retrieve(
                HttpRequest.GET("/genres/list"), Argument.listOf(Genre.class));
        assertEquals(2, genres.size());

        genres = client.toBlocking().retrieve(
                HttpRequest.GET("/genres/list?size=1"), Argument.listOf(Genre.class));
        assertEquals(1, genres.size());
        assertEquals("DevOps", genres.get(0).getName());

        genres = client.toBlocking().retrieve(
                HttpRequest.GET("/genres/list?size=1&sort=name,desc"), Argument.listOf(Genre.class));
        assertEquals(1, genres.size());
        assertEquals("Micro-services", genres.get(0).getName());

        genres = client.toBlocking().retrieve(
                HttpRequest.GET("/genres/list?size=1&page=2"), Argument.listOf(Genre.class));
        assertEquals(0, genres.size());

        response = client.toBlocking().exchange(
                HttpRequest.DELETE("/genres/" + id));
        assertEquals(NO_CONTENT, response.getStatus());
    }

    private Long entityId(HttpResponse<?> response) {
        String value = response.header(LOCATION);
        if (value == null) {
            return null;
        }
        String path = "/genres/";
        int index = value.indexOf(path);
        return index == -1 ? null : Long.valueOf(value.substring(index + path.length()));
    }

    @Inject
    GenreRepository genreRepository;

    @AfterEach
    void cleanup() {
        genreRepository.deleteAll();
    }
}

2. Create an Oracle Database on Amazon RDS #

You will create an Oracle Database instance with the AWS CLI. See the AWS CLI rds Command Reference to learn more about AWS RDS.

2.1. Create an Administrator Account #

Instead of using your AWS root account, use an administrator account. If you do not have one already, see Setting up Your Cloud Accounts.

2.2. Create VPC, Security Group, Subnets, and Subnet Group (Optional) #

To allow connections to the database from your local computer, create a VPC, and a security group that allows access to the database default port from your current public IP address.

Note: Exposing a database port to the internet is a security risk. This should be done only for development purposes.

You will also create two subnets in different availability zones and a subnet group to associate them.

Some of the following commands use jq, which is a lightweight and flexible command-line JSON processor.

# VPC, internet gateway and route table
export VPC_ID=$(aws ec2 create-vpc --cidr-block 10.0.0.0/16 | jq -r '.Vpc.VpcId')
export IG_ID=$(aws ec2 create-internet-gateway | jq -r '.InternetGateway.InternetGatewayId')
aws ec2 attach-internet-gateway --internet-gateway-id $IG_ID --vpc-id $VPC_ID
aws ec2 modify-vpc-attribute --enable-dns-hostnames --vpc-id $VPC_ID
export RT_ID=$(aws ec2 describe-route-tables --filters "Name=vpc-id,Values=$VPC_ID" --query "RouteTables[].RouteTableId" --output text)
aws ec2 create-route --route-table-id $RT_ID --destination-cidr-block 0.0.0.0/0 --gateway-id $IG_ID

# Security group
aws ec2 create-security-group --group-name gdk-guides-oracledb-sg --description "Security Group for the GDK Oracle DB guide" --vpc-id $VPC_ID
export SG_ID=$(aws ec2 describe-security-groups --query 'SecurityGroups[?GroupName==`gdk-guides-oracledb-sg`].GroupId' --output text)
aws ec2 authorize-security-group-ingress --group-id $SG_ID --protocol tcp --port 1521 --cidr $(curl ifconfig.me)/32

# Subnets and subnet group
export AZ_0=$(aws ec2 describe-availability-zones --filters "Name=state,Values=available" --query "AvailabilityZones[0].ZoneName" --output text)
export AZ_1=$(aws ec2 describe-availability-zones --filters "Name=state,Values=available" --query "AvailabilityZones[1].ZoneName" --output text)
export SN0_ID=$(aws ec2 create-subnet --vpc-id $VPC_ID --cidr-block 10.0.0.0/20 --availability-zone $AZ_0 | jq -r '.Subnet.SubnetId')
export SN1_ID=$(aws ec2 create-subnet --vpc-id $VPC_ID --cidr-block 10.0.16.0/20 --availability-zone $AZ_1 | jq -r '.Subnet.SubnetId')
aws ec2 modify-subnet-attribute --subnet-id $SN0_ID --map-public-ip-on-launch
aws ec2 modify-subnet-attribute --subnet-id $SN1_ID --map-public-ip-on-launch
aws rds create-db-subnet-group --db-subnet-group-name gdk-guides-oracledb-sng --db-subnet-group-description "DB subnet group for the GDK Oracle DB guide" --subnet-ids "$SN0_ID" "$SN1_ID"

2.3. Create an Oracle RDS Instance #

Run this command to create a MySQL instance in AWS RDS:

 aws rds create-db-instance \
     --db-name DATABASE \
     --db-instance-identifier gdk-guides-oracledb \
     --db-instance-class db.m5.large \
     --engine oracle-se2 \
     --master-username admin \
     --master-user-password secret99 \
     --allocated-storage 20 \
     --db-subnet-group-name gdk-guides-oracledb-sng \
     --vpc-security-group-ids $SG_ID \
     --license-model license-included \
     --publicly-accessible

Wait for the instance to become available:

 aws rds wait db-instance-available --db-instance-identifier gdk-guides-oracledb

Once the instance is available, set the value of an environment variable (named ORACLEDB_HOST) to represent its hostname:

 export ORACLEDB_HOST=$(aws rds describe-db-instances --query 'DBInstances[?DBInstanceIdentifier==`gdk-guides-oracledb`].Endpoint.Address' --output text)

2.4. Create a Database and a Database User #

Connect to the database using the SqlPlus Client CLI. When prompted, insert the master user password that you specified before.
```
 sqlplus admin@$ORACLEDB_HOST:1521/DATABASE
```
Run the following SQL commands. Replace the text “XXXXXXXXX” with a password of your choice (must be at least 12 characters and contain a number and an uppercase letter).
```
 CREATE USER gdk_user IDENTIFIED BY "XXXXXXXXX";
 GRANT CONNECT, RESOURCE TO gdk_user;
 GRANT UNLIMITED TABLESPACE TO gdk_user;
```
Exit the SQLPlus console by entering “exit”.

3. Configuration #

Before you can test or run your application, provide configuration for Flyway and the application’s datasources.

3.1. Configure Flyway #

The GDK Launcher included Flyway for database migrations. It uses the Micronaut integration with Flyway project that automates schema changes, significantly simplifies schema management tasks, such as migrating, rolling back, and reproducing in multiple environments.

Flyway migration is automatically triggered before your application starts. Flyway reads migration file(s) in the lib/src/main/resources/db/migration/ directory, runs them if necessary, and verifies that the configured datasource is consistent with them.

The migration file with the database schema, lib/src/main/resources/db/migration/V1__schema.sql, was also created for you by the GDK Launcher.

CREATE TABLE "GENRE" (
   "ID"    NUMBER(19) PRIMARY KEY NOT NULL,
   "NAME"  VARCHAR(255) NOT NULL
);
CREATE SEQUENCE "GENRE_SEQ" MINVALUE 1 START WITH 1 NOCACHE NOCYCLE;

During application startup, Flyway runs the commands in the SQL file and creates the schema needed for the application.

3.2. Configure Datasources #

Set values for the missing datasources.default.url, datasources.default.username, and datasources.default.password properties by exporting them as environment variables as follows:

export DATASOURCES_DEFAULT_URL=jdbc:oracle:thin:@$ORACLEDB_HOST:1521/DATABASE
export DATASOURCES_DEFAULT_USERNAME=<username> # 1
export DATASOURCES_DEFAULT_PASSWORD=<password> # 2

set DATASOURCES_DEFAULT_URL=jdbc:oracle:thin:@$ORACLEDB_HOST:1521/DATABASE
set DATASOURCES_DEFAULT_USERNAME=<username> # 1
set DATASOURCES_DEFAULT_PASSWORD=<password> # 2

$ENV:DATASOURCES_DEFAULT_URL = "jdbc:oracle:thin:@$ORACLEDB_HOST:1521/DATABASE"
$ENV:DATASOURCES_DEFAULT_USERNAME = "<username>" # 1
$ENV:DATASOURCES_DEFAULT_PASSWORD = "<password>" # 2

1 Replace the <username> with “gdk_user” (the name of the user you created).

2 Replace the <password> with the “gdk_user” password you created.

4. Run the Application #

To run the application, use the following command, which starts the application on port 8080.

Gradle
Maven

./gradlew :aws:run

./mvnw install -pl lib -am
./mvnw mn:run -pl aws

5. Test the Application #

Test the application by accessing its REST endpoints.

Run this command to test creating and storing a new Genre in the database:

curl -X "POST" "http://localhost:8080/genres" \
    -H 'Content-Type: application/json; charset=utf-8' \
    -d $'{ "name": "music" }'

You should see a response similar to:

{"id":1,"name":"music"}

Confirm that the new Genre is saved in the database by listing its contents:

curl localhost:8080/genres/list

You should see a response similar to:

[{"id":1,"name":"music"}]

Retrieve a single Genre from the database as follows:

curl -i http://localhost:8080/genres/1

You should see a response similar to:

{"id":1,"name":"music"}

Delete the Genre you added and then list the contents of the database to confirm that it has been deleted:

curl -X "DELETE" "http://localhost:8080/genres/1"
curl localhost:8080/genres/list

6. Generate a Native Executable Using GraalVM #

The GDK supports compiling a Java application ahead-of-time into a native executable using GraalVM Native Image. You can use the Gradle plugin for GraalVM Native Image building/Maven plugin for GraalVM Native Image building. Packaged as a native executable, it significantly reduces application startup time and memory footprint.

Make sure to add the reflect-config.json file in /Users/anlagrot/gdk/guides/testing/aws-adb-demo-java-gradle/aws/src/main/resources/META-INF/native-image/com/example with the following content:

[
{
  "name":"org.flywaydb.core.api.migration.baseline.BaselineMigrationConfigurationExtension",
  "allDeclaredFields":true,
  "queryAllDeclaredMethods":true,
  "queryAllDeclaredConstructors":true,
  "methods":[{"name":"<init>","parameterTypes":[] }, {"name":"getBaselineMigrationPrefix","parameterTypes":[] }, {"name":"setBaselineMigrationPrefix","parameterTypes":["java.lang.String"] }]
},
{
  "name":"org.flywaydb.core.extensibility.ConfigurationExtension",
  "queryAllDeclaredMethods":true
},
{
  "name":"org.flywaydb.core.extensibility.Plugin",
  "queryAllDeclaredMethods":true
},
{
  "name":"org.flywaydb.core.internal.command.clean.CleanModeConfigurationExtension",
  "allDeclaredFields":true,
  "queryAllDeclaredMethods":true,
  "queryAllDeclaredConstructors":true,
  "methods":[{"name":"<init>","parameterTypes":[] }, {"name":"getClean","parameterTypes":[] }, {"name":"setClean","parameterTypes":["org.flywaydb.core.internal.command.clean.CleanModel"] }]
},
{
  "name":"org.flywaydb.core.internal.command.clean.CleanModel",
  "allDeclaredFields":true,
  "queryAllDeclaredMethods":true,
  "queryAllDeclaredConstructors":true
},
{
  "name":"org.flywaydb.core.internal.command.clean.SchemaModel",
  "allDeclaredFields":true,
  "queryAllDeclaredMethods":true,
  "queryAllDeclaredConstructors":true
},
{
  "name":"org.flywaydb.core.internal.logging.slf4j.Slf4jLogCreator",
  "methods":[{"name":"<init>","parameterTypes":[] }]
},
{
  "name":"org.flywaydb.core.internal.proprietaryStubs.LicensingConfigurationExtensionStub",
  "allDeclaredFields":true
},
{
  "name":"org.flywaydb.database.oracle.OracleConfigurationExtension",
  "allDeclaredFields":true,
  "queryAllDeclaredMethods":true,
  "queryAllDeclaredConstructors":true,
  "methods":[{"name":"<init>","parameterTypes":[] }, {"name":"getKerberosCacheFile","parameterTypes":[] }, {"name":"getSqlplus","parameterTypes":[] }, {"name":"getSqlplusWarn","parameterTypes":[] }, {"name":"getWalletLocation","parameterTypes":[] }, {"name":"setKerberosCacheFile","parameterTypes":["java.lang.String"] }, {"name":"setSqlplus","parameterTypes":["java.lang.Boolean"] }, {"name":"setSqlplusWarn","parameterTypes":["java.lang.Boolean"] }, {"name":"setWalletLocation","parameterTypes":["java.lang.String"] }]
}
]

To generate a native executable, run the following command:

Gradle
Maven

./gradlew :aws:nativeCompile

The native executable is created in the aws/build/native/nativeCompile/ directory and can be run with the following command:

aws/build/native/nativeCompile/aws

./mvnw install -pl lib -am
./mvnw clean package -pl aws -Dpackaging=native-image

The native executable is created in the aws/target/ directory and can be run with the following command:

aws/target/aws-oracledb-demo-aws

7. Run and Test the Native Executable #

Run the native executable, and then perform the same tests as in step 5.

8. Clean Up Cloud Resources #

Once you are done with this guide, you can stop and/or delete the AWS resources created to avoid incurring unnecessary charges. Run these commands:

aws rds delete-db-instance --db-instance-identifier gdk-guides-oracledb --skip-final-snapshot
aws rds wait db-instance-deleted --db-instance-identifier gdk-guides-oracledb
aws ec2 delete-subnet --subnet-id $SN0_ID
aws ec2 delete-subnet --subnet-id $SN1_ID
aws rds delete-db-subnet-group --db-subnet-group-name gdk-guides-oracledb-sng
aws ec2 delete-security-group --group-id $SG_ID
aws ec2 detach-internet-gateway --internet-gateway-id $IG_ID --vpc-id $VPC_ID
aws ec2 delete-internet-gateway --internet-gateway-id $IG_ID
aws ec2 delete-vpc --vpc-id $VPC_ID

Summary #

This guide demonstrated how to use the GDK to create a database application that stores data in an Oracle Database on Amazon RDS using Micronaut Data. You also saw how to package this application into a native executable.

Create and Connect a Micronaut Application to an Oracle Database on Amazon Relational Database Service

Prerequisites #

A note regarding your development environment

1. Create the Application #

1.1. Domain Entity #

1.2. Repository Interface #

1.3. Controller #

1.4. Service #

1.5. Tests #

2. Create an Oracle Database on Amazon RDS #

2.1. Create an Administrator Account #

2.2. Create VPC, Security Group, Subnets, and Subnet Group (Optional) #

2.3. Create an Oracle RDS Instance #

2.4. Create a Database and a Database User #

3. Configuration #

3.1. Configure Flyway #

3.2. Configure Datasources #

4. Run the Application #

5. Test the Application #

6. Generate a Native Executable Using GraalVM #

7. Run and Test the Native Executable #

8. Clean Up Cloud Resources #

Summary #

Related Documentation #