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Eclipse MicroProfile is a community dedicated to optimizing the Enterprise Java mission for microservice-based architectures. The goal is to define a microservices application platform that is portable across multiple runtimes. Currently, the leading players in this group are IBM, Red Hat, Tomitribe, Payara, the London Java Community (LJC), and SouJava.

Java Enterprise Edition (Java EE) is an umbrella that holds specifications and APIs with enterprise features, like distributed computing and web services. Widely used in Java, Java EE runs on reference runtimes that can be anything from microservices to application servers that handle transactions, security, scalability, concurrency, and management for the components it’s deploying. Now, Enterprise Java has been standardized under the Eclipse Foundation with the name Jakarta EE.

Services Anchor to this heading

Configuration reader Anchor to this heading

While you can read the environment directly from your app, you might want to use theJava configuration reader library. It decodes service credentials, the correct port, and other information for you.

Note that the Java configuration reader library is used in the following examples.

MongoDB Anchor to this heading

You can use Jakarta NoSQL/JNoSQL to use MongoDB with your application by first determining the MongoDB client programmatically.

import com.mongodb.MongoClient;
import jakarta.nosql.document.DocumentCollectionManager;
import jakarta.nosql.document.DocumentCollectionManagerFactory;
import org.jnosql.diana.mongodb.document.MongoDBDocumentConfiguration;
import sh.platform.config.Config;
import sh.platform.config.MongoDB;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;

@ApplicationScoped
class DocumentManagerProducer {

    private DocumentCollectionManagerFactory managerFactory;

    private MongoDB mongoDB;

    @PostConstruct
    public void init() {
        Config config = new Config();
        this.mongoDB = config.getCredential("database", MongoDB::new);
        final MongoClient mongoClient = mongoDB.get();
        MongoDBDocumentConfiguration configuration = new MongoDBDocumentConfiguration();
        this.managerFactory = configuration.get(mongoClient);
    }

    @Produces
    public DocumentCollectionManager getManager() {
        return managerFactory.get(mongoDB.getDatabase());
    }

    public void destroy(@Disposes DocumentCollectionManager manager) {
        this.manager.close();
    }
}

Apache Solr Anchor to this heading

You can use Jakarta NoSQL/JNoSQL to use Solr with your application by first determining the Solr client programmatically.

import jakarta.nosql.document.DocumentCollectionManager;
import jakarta.nosql.document.DocumentCollectionManagerFactory;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.jnosql.diana.solr.document.SolrDocumentConfiguration;
import sh.platform.config.Config;
import sh.platform.config.Solr;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;

@ApplicationScoped
class DocumentManagerProducer {

    private DocumentCollectionManagerFactory managerFactory;

    @PostConstruct
    public void init() {
        Config config = new Config();
        Solr solr = config.getCredential("database", Solr::new);
        final HttpSolrClient httpSolrClient = solr.get();
        SolrDocumentConfiguration configuration = new SolrDocumentConfiguration();
        this.managerFactory = configuration.get(httpSolrClient);
    }

    @Produces
    public DocumentCollectionManager getManager() {
        return managerFactory.get("collection");
    }

    public void destroy(@Disposes DocumentCollectionManager manager) {
        this.manager.close();
    }
}

Elasticsearch Anchor to this heading

You can use Jakarta NoSQL/JNoSQL to use Elasticsearch with your application by first determining the Elasticsearch client programmatically.

import jakarta.nosql.document.DocumentCollectionManager;
import jakarta.nosql.document.DocumentCollectionManagerFactory;
import org.elasticsearch.client.RestHighLevelClient;
import org.jnosql.diana.elasticsearch.document.ElasticsearchDocumentConfiguration;
import sh.platform.config.Config;
import sh.platform.config.Elasticsearch;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;

@ApplicationScoped
class DocumentManagerProducer {

    private DocumentCollectionManagerFactory managerFactory;

    @PostConstruct
    public void init() {
        Config config = new Config();
        Elasticsearch elasticsearch = config.getCredential("database", Elasticsearch::new);
        final RestHighLevelClient client = elasticsearch.get();
        ElasticsearchDocumentConfiguration configuration = new ElasticsearchDocumentConfiguration();
        this.managerFactory = configuration.get(client);
    }

    @Produces
    public DocumentCollectionManager getManager() {
        return managerFactory.get("collection");
    }

    public void destroy(@Disposes DocumentCollectionManager manager) {
        this.manager.close();
    }
}

Redis Anchor to this heading

You can use Jakarta NoSQL/JNoSQL to use Redis with your application by first determining the Redis client programmatically.

import jakarta.nosql.keyvalue.BucketManager;
import org.jnosql.diana.redis.keyvalue.RedisBucketManagerFactory;
import org.jnosql.diana.redis.keyvalue.RedisConfiguration;
import redis.clients.jedis.JedisPool;
import sh.platform.config.Config;
import sh.platform.config.Redis;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;

@ApplicationScoped
class BucketManagerProducer {

    private static final String BUCKET = "olympus";

    private RedisBucketManagerFactory managerFactory;

    @PostConstruct
    public void init() {
        Config config = new Config();
        Redis redis = config.getCredential("redis", Redis::new);
        final JedisPool jedisPool = redis.get();
        RedisConfiguration configuration = new RedisConfiguration();
        managerFactory = configuration.get(jedisPool);
    }

    @Produces
    public BucketManager getManager() {
        return managerFactory.getBucketManager(BUCKET);
    }

    public void destroy(@Disposes BucketManager manager) {
        manager.close();
    }

}

MySQL Anchor to this heading

MySQL is an open-source relational database technology, and Jakarta EE supports a robust integration with it: JPA.

The first step is to choose the database that you would like to use in your project. Define the driver for MySQL and the Java dependencies. Then determine the DataSource client programmatically:

import sh.platform.config.Config;
import sh.platform.config.JPA;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

@ApplicationScoped
class EntityManagerConfiguration {

    private EntityManagerFactory entityManagerFactory;

    private EntityManager entityManager;

    @PostConstruct
    void setUp() {
        Config config = new Config();
        final JPA credential = config.getCredential("postgresql", JPA::new);
        entityManagerFactory = credential.getMySQL("jpa-example");
        this.entityManager = entityManagerFactory.createEntityManager();
    }

    @Produces
    @ApplicationScoped
    EntityManagerFactory getEntityManagerFactory() {
        return entityManagerFactory;
    }

    @Produces
    @ApplicationScoped
    EntityManager getEntityManager() {
        return entityManager;
    }

    void close(@Disposes EntityManagerFactory entityManagerFactory) {
        entityManagerFactory.close();
    }

    void close(@Disposes EntityManager entityManager) {
        entityManager.close();
    }

}

MariaDB Anchor to this heading

MariaDB is an open-source relational database technology, and Jakarta EE supports a robust integration with it: JPA.

The first step is to choose the database that you would like to use in your project. Define the driver for MariaDB and the Java dependencies. Then determine the DataSource client programmatically:

import sh.platform.config.Config;
import sh.platform.config.JPA;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

@ApplicationScoped
class EntityManagerConfiguration {

    private EntityManagerFactory entityManagerFactory;

    private EntityManager entityManager;

    @PostConstruct
    void setUp() {
        Config config = new Config();
        final JPA credential = config.getCredential("postgresql", JPA::new);
        entityManagerFactory = credential.getMariaDB("jpa-example");
        this.entityManager = entityManagerFactory.createEntityManager();
    }

    @Produces
    @ApplicationScoped
    EntityManagerFactory getEntityManagerFactory() {
        return entityManagerFactory;
    }

    @Produces
    @ApplicationScoped
    EntityManager getEntityManager() {
        return entityManager;
    }

    void close(@Disposes EntityManagerFactory entityManagerFactory) {
        entityManagerFactory.close();
    }

    void close(@Disposes EntityManager entityManager) {
        entityManager.close();
    }

}

PostgreSQL Anchor to this heading

PostgreSQL is an open-source relational database technology, and Jakarta EE supports a robust integration with it: JPA.

The first step is to choose the database that you would like to use in your project. Define the driver for PostgreSQL and the Java dependencies. Then determine the DataSource client programmatically:

import sh.platform.config.Config;
import sh.platform.config.JPA;

import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Disposes;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

@ApplicationScoped
class EntityManagerConfiguration {

    private EntityManagerFactory entityManagerFactory;

    private EntityManager entityManager;

    @PostConstruct
    void setUp() {
        Config config = new Config();
        final JPA credential = config.getCredential("postgresql", JPA::new);
        entityManagerFactory = credential.getPostgreSQL("jpa-example");
        entityManager = entityManagerFactory.createEntityManager();
    }

    @Produces
    @ApplicationScoped
    EntityManagerFactory getEntityManagerFactory() {
        return entityManagerFactory;
    }

    @Produces
    @ApplicationScoped
    EntityManager getEntityManager() {
        return entityManager;
    }

    void close(@Disposes EntityManagerFactory entityManagerFactory) {
        entityManagerFactory.close();
    }

    void close(@Disposes EntityManager entityManager) {
        entityManager.close();
    }

}

Transaction Anchor to this heading

To any Eclipse MicroProfile or any non-JTA application is essential to point out, CDI doesn’t provide transaction management implementation as part of its specs. Transaction management is left to be implemented by the programmer through the interceptors, such as the code below.

import javax.annotation.Priority;
import javax.inject.Inject;
import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;
import javax.transaction.Transactional;

@Transactional
@Interceptor
@Priority(Interceptor.Priority.APPLICATION)
public class TransactionInterceptor {

    @Inject
    private EntityManager manager;

    @AroundInvoke
    public Object manageTransaction(InvocationContext context) throws Exception {
        final EntityTransaction transaction = manager.getTransaction();
        transaction.begin();
        try {
            Object result = context.proceed();
            transaction.commit();
            return result;
        } catch (Exception exp) {
            transaction.rollback();
            throw exp;
        }
    }
}

To treat this issue, see the Apache Delta Spike docs.

Templates Anchor to this heading

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