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The org.apache.openejb.junit5.ApplicationComposerExtension is a JUnit 5 extension internally re-using ApplicationComposers, which has been used in the JUnit test runner ( ApplicationComposer) for testing OpenEJB in recent years. It involves no classpath scanning at all. If you want something to be in the app, you must build it directly in your testcase.

With the RunWithApplicationComposer you can do identical testing that OpenEJB uses internally, but with limited dependency on OpenEJB itself. The main dependency is:


Make sure to use a maven surefire version greater or equal to 3.0.0-M5 and add the required dependencies for JUnit 5.

Composing an Application

The main difference to the embedded EJBContainer API is building the application in the test code. This is done with one or more methods in the test case annotated with org.apache.openejb.testing.Module using the following format:

public <return-value> <module-name>() {

Where module-name is the name you wish to use for that module and return-value can be any one of the following:

  • java.lang.Class

  • java.lang.Class[]

  • org.apache.openejb.jee.EjbJar

  • org.apache.openejb.jee.EnterpriseBean

  • org.apache.openejb.jee.Application

  • org.apache.openejb.jee.Connector

  • org.apache.openejb.jee.Beans

  • org.apache.openejb.jee.jpa.unit.Persistence

  • org.apache.openejb.jee.jpa.unit.PersistenceUnit


Used in an actual testcase, that might look like so:

import org.apache.openejb.jee.EjbJar;
import org.apache.openejb.jee.StatefulBean;
import org.apache.openejb.jee.jpa.unit.PersistenceUnit;
import org.apache.openejb.junit5.RunWithApplicationComposer;
import org.apache.openejb.testing.Configuration;
import org.apache.openejb.testing.Module;
import org.junit.jupiter.api.Test;

import jakarta.annotation.Resource;
import jakarta.ejb.EJB;
import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import jakarta.transaction.UserTransaction;
import java.util.List;
import java.util.Properties;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class MoviesTest {

    private Movies movies;

    private UserTransaction userTransaction;

    private EntityManager entityManager;

    public PersistenceUnit persistence() {
        PersistenceUnit unit = new PersistenceUnit("movie-unit");
        unit.setProperty("openjpa.jdbc.SynchronizeMappings", "buildSchema(ForeignKeys=true)");
        return unit;

    public EjbJar beans() {
        EjbJar ejbJar = new EjbJar("movie-beans");
        ejbJar.addEnterpriseBean(new StatefulBean(MoviesImpl.class));
        return ejbJar;

    public Properties config() throws Exception {
        Properties p = new Properties();
        p.put("movieDatabase", "new://Resource?type=DataSource");
        p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver");
        p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb");
        return p;

    public void test() throws Exception {


        try {
            entityManager.persist(new Movie("Quentin Tarantino", "Reservoir Dogs", 1992));
            entityManager.persist(new Movie("Joel Coen", "Fargo", 1996));
            entityManager.persist(new Movie("Joel Coen", "The Big Lebowski", 1998));

            List<Movie> list = movies.getMovies();
            assertEquals(3, list.size(), "List.size()");

            for (Movie movie : list) {

            assertEquals(0, movies.getMovies().size(), "Movies.getMovies()");

        } finally {