Getting this error when trying to test active object reader method?

[Saurabh Gupta]

java.lang.NoClassDefFoundError: com/atlassian/activeobjects/spi/DatabaseType

 at com.zxc.activeobjects.test.TestActiveObjects.<clinit>(TestActiveObjects.java:18)
 at com.zxc.jira.app.service.DBManagerImplTest.setUp(DBManagerImplTest.java:30)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
 at net.java.ao.test.junit.ActiveObjectTransactionMethodRule$1.evaluate(ActiveObjectTransactionMethodRule.java:82)
 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
 at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
 at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
 at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
 at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.ClassNotFoundException: com.atlassian.activeobjects.spi.DatabaseType
 at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 ... 26 more

Actual class -

package com.zxc.jira.app.service;

import com.zxc.jira.app.ao.Credentials;
import com.atlassian.activeobjects.external.ActiveObjects;
import com.atlassian.activeobjects.test.TestActiveObjects;
import net.java.ao.EntityManager;
import net.java.ao.test.jdbc.DatabaseUpdater;
import net.java.ao.test.junit.ActiveObjectsJUnitRunner;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

@RunWith(ActiveObjectsJUnitRunner.class)
public class DBManagerImplTest {

    private ActiveObjects ao;
    private EntityManager entityManager;
    private DBManagerImpl dbManager;

    @Before
    public void setUp() throws Exception {
        assertNotNull(entityManager);
        ao = new TestActiveObjects(entityManager);
        dbManager = new DBManagerImpl(ao);
    }

    @After
    public void tearDown() throws Exception {
    }

    @Test
    public void getAuthToken() {
        Map<String, String> map = new HashMap<>();
        map.put("url", "https://www.zxc.com");
        map.put("authToken", "f1%Z8Z3YPxQ01NhBMj6&");
        assertEquals("https://www.zxc.com", dbManager.getAuthToken());
    }

    @Test
    public void doesAuthTokenExist() {
        assertEquals(true, dbManager.doesAuthTokenExist());
    }

    public static class DBManagerImplTestDatabaseUpdater implements DatabaseUpdater
    {
        @Override
        public void update(EntityManager em) throws Exception
        {
            em.migrate(Credentials.class);

            final Credentials credentials = em.create(Credentials.class);
            credentials.setUrl("https://www.zxc.com");
            credentials.setAuthToken("f1%Z8Z3YPxQ01NhBMj6&");
            credentials.save();
        }
    }
}

[Saurabh Gupta · Accepted solution]

My mistake did not add active-object SPI dependency. As it was not mentioned in the tutorial so I thought it was not needed. For those who got this error use - 

<dependency>
    <groupId>com.atlassian.activeobjects</groupId>
    <artifactId>activeobjects-spi</artifactId>
    <version>${ao.version}</version>
    <scope>test</scope>
</dependency>

Note:   Atlassian team, if you think this question is useless please delete it.