Testcontainers-java: Not started with @ClassRule

[4ntoine]

I use @ClassRule annotation to create container and start it:

@ClassRule
    public static MySQLContainer mySqlContainer = new MySQLContainer("mysql:5.6.40");
    protected EntityManager entityManager;

    @Before
    protected void setUp(Class... dbEntityClasses) throws Exception {
        // override EMF settings
        Map dataSourceProperties = new HashMap();
        String connectionSource = mySqlContainer.getJdbcUrl()
            + "?user=" + mySqlContainer.getUsername()
            + "&password=" + mySqlContainer.getPassword();
        dataSourceProperties.put("javax.persistence.jdbc.url", connectionSource);
        dataSourceProperties.put("javax.persistence.jdbc.driver", mySqlContainer.getDriverClassName());
        PersistenceFactory.getInstance().setProperties(dataSourceProperties);

        // get db connection
        entityManager = PersistenceFactory.getInstance().getEntityManager();
    }

However i'm getting an exception later:

java.lang.IllegalStateException: Mapped port can only be obtained after the container is started

    at org.testcontainers.shaded.com.google.common.base.Preconditions.checkState(Preconditions.java:174)
    at org.testcontainers.containers.ContainerState.getMappedPort(ContainerState.java:89)
    at org.testcontainers.containers.MySQLContainer.getJdbcUrl(MySQLContainer.java:56)

I've checked mySqlContainer.isRunning() returns false in mySqlContainer.getJdbcUrl() line (see code above).

Is it a bug or a feature?

[bsideup]

Hi @4ntoine,
You sure you're using JUnit? :)

Also, don't you want to just use the JDBC-style support?
https://www.testcontainers.org/usage/database_containers.html#jdbc-url

[4ntoine]

1. Sure:

/**
 * Test for Dao
 */
public abstract class DaoTest {

    @ClassRule
    public static MySQLContainer mySqlContainer = new MySQLContainer("mysql:5.6.40");
    protected EntityManager entityManager;
  ...

What makes you think i'm not?

1. I use JPA, so i need to override properties with map.

1. BTW DockerRule works as expected (starts using @ClassRule ann):
   https://github.com/geowarin/docker-junit-rule/blob/master/src/test/java/integration/RabbitIntegrationTest.java

[4ntoine]

Having both annotations and extending TestCase was the reason

[bbailey12]

@4ntoine I'm confused by how you solved it. Can you please give more details?

[Zanndorin]

For anyone finding this in 2019 the problem is probably that you are confused if you are using Junit4 or Junit5.

Junit5 -> @TestContainer
Junit4 -> @Classrule

Check your imports.

[raffig]

If test is parametrized take a look at: https://github.com/testcontainers/testcontainers-java/issues/1774

[aashraf-tableau]

Junit5 -> @TestContainer

Junit5 -> @Container