= Application Composer
:index-group: Testing Techniques
:jbake-type: page
:jbake-status: published

The `org.apache.openejb.junit.ApplicationComposer` is JUnit test runner modeled after the way we've done testing internally in OpenEJB for years (since about 2006).
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 `ApplicationComposer` you can do identical testing that OpenEJB uses internally, but with limited dependency on OpenEJB itself.  The main dependency is on the code
that is used to build the actual applications:

[source,xml]
----
<dependency>
  <groupId>org.apache.tomee</groupId>
  <artifactId>openejb-core</artifactId>
  <version>${openejb.version}</version>
</dependency>
----

== 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:

[source,java]
----
@Module
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

== Example

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

[source,java,numbered]
----
    import junit.framework.TestCase;
    import org.apache.openejb.jee.EjbJar;
    import org.apache.openejb.jee.StatefulBean;
    import org.apache.openejb.jee.jpa.unit.PersistenceUnit;
    import org.apache.openejb.junit.ApplicationComposer;
    import org.apache.openejb.testing.Configuration;
    import org.apache.openejb.testing.Module;
    import org.junit.Test;
    import org.junit.runner.RunWith;

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

    @RunWith(ApplicationComposer.class)
    public class MoviesTest extends TestCase {

        @EJB
        private Movies movies;

        @Resource
        private UserTransaction userTransaction;

        @PersistenceContext
        private EntityManager entityManager;

        @Module
        public PersistenceUnit persistence() {
            PersistenceUnit unit = new PersistenceUnit("movie-unit");
            unit.setJtaDataSource("movieDatabase");
            unit.setNonJtaDataSource("movieDatabaseUnmanaged");
            unit.getClazz().add(Movie.class.getName());
            unit.setProperty("openjpa.jdbc.SynchronizeMappings", "buildSchema(ForeignKeys=true)");
            return unit;
        }

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

        @Configuration
        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;
        }

        @Test
        public void test() throws Exception {

            userTransaction.begin();

            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("List.size()", 3, list.size());

                for (Movie movie : list) {
                    movies.deleteMovie(movie);
                }

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

            } finally {
                userTransaction.commit();
            }
        }
    }
----

# Running
```
    -------------------------------------------------------
     T E S T S
    -------------------------------------------------------
    Running org.superbiz.composed.MoviesTest
    INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
    INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
    INFO - Configuring Service(id=movieDatabase, type=Resource, provider-id=Default JDBC Database)
    INFO - Configuring enterprise application: /Users/dblevins/examples/application-composer/MoviesTest
    WARN - Method 'lookup' is not available for 'javax.annotation.Resource'. Probably using an older Runtime.
    INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
    INFO - Auto-creating a container for bean org.superbiz.composed.MoviesTest: Container(type=MANAGED, id=Default Managed Container)
    INFO - Configuring Service(id=Default Stateful Container, type=Container, provider-id=Default Stateful Container)
    INFO - Auto-creating a container for bean MoviesImpl: Container(type=STATEFUL, id=Default Stateful Container)
    INFO - Configuring PersistenceUnit(name=movie-unit)
    INFO - Auto-creating a Resource with id 'movieDatabaseNonJta' of type 'DataSource for 'movie-unit'.
    INFO - Configuring Service(id=movieDatabaseNonJta, type=Resource, provider-id=movieDatabase)
    INFO - Adjusting PersistenceUnit movie-unit <non-jta-data-source> to Resource ID 'movieDatabaseNonJta' from 'movieDatabaseUnmanaged'
    INFO - Enterprise application "/Users/dblevins/examples/application-composer/MoviesTest" loaded.
    INFO - Assembling app: /Users/dblevins/examples/application-composer/MoviesTest
    INFO - PersistenceUnit(name=movie-unit, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 449ms
    INFO - Jndi(name=org.superbiz.composed.MoviesTestLocalBean) --> Ejb(deployment-id=org.superbiz.composed.MoviesTest)
    INFO - Jndi(name=global/MoviesTest/EjbModule2027711095/MoviesTest!org.superbiz.composed.MoviesTest) --> Ejb(deployment-id=org.superbiz.composed.MoviesTest)
    INFO - Jndi(name=global/MoviesTest/EjbModule2027711095/MoviesTest) --> Ejb(deployment-id=org.superbiz.composed.MoviesTest)
    INFO - Jndi(name=MoviesImplLocal) --> Ejb(deployment-id=MoviesImpl)
    INFO - Jndi(name=global/MoviesTest/movie-beans/MoviesImpl!org.superbiz.composed.Movies) --> Ejb(deployment-id=MoviesImpl)
    INFO - Jndi(name=global/MoviesTest/movie-beans/MoviesImpl) --> Ejb(deployment-id=MoviesImpl)
    INFO - Created Ejb(deployment-id=org.superbiz.composed.MoviesTest, ejb-name=MoviesTest, container=Default Managed Container)
    INFO - Created Ejb(deployment-id=MoviesImpl, ejb-name=MoviesImpl, container=Default Stateful Container)
    INFO - Started Ejb(deployment-id=org.superbiz.composed.MoviesTest, ejb-name=MoviesTest, container=Default Managed Container)
    INFO - Started Ejb(deployment-id=MoviesImpl, ejb-name=MoviesImpl, container=Default Stateful Container)
    INFO - Deployed Application(path=/Users/dblevins/examples/application-composer/MoviesTest)
    INFO - Undeploying app: /Users/dblevins/examples/application-composer/MoviesTest
    Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.221 sec

    Results :

    Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
```