JerseyTest and JUnit throws NullPointerException

Question

I have some problems with the jersey test framework. If i use the @Before and @After annotations, then the target method throws a NullPointerException. I thought JerseyTest works with JUnit? Where is my problem?

• Jersey: 2.12
• JUnit: 4.11

Code that fails:

public class MyResourceTest extends JerseyTest {
    @Before
    public void setUp() { }

    @After
    public void tearDown() { }

    @Override
    protected Application configure() {
        return new ResourceConfig(MyResource.class);
    }

    @Test
    public void SHOULD_RETURN_BAD_REQUEST() throws IOException {
        System.out.println(target("myPath"));
        assertEquals(1, 1);
    }
}

Result:

java.lang.NullPointerException at org.glassfish.jersey.test.JerseyTest.target(JerseyTest.java:566) at org.glassfish.jersey.test.JerseyTest.target(JerseyTest.java:580) at foo.bar.MyResourceTest.SHOULD_RETURN_BAD_REQUEST(MyResourceTest.java:43)

Code that works:

public class MyResourceTest extends JerseyTest {
    @Override
    protected Application configure() {
        return new ResourceConfig(MyResource.class);
    }

    @Test
    public void SHOULD_RETURN_BAD_REQUEST() throws IOException {
        System.out.println(target("myPath"));
        assertEquals(1, 1);
    }
}

Result:

JerseyWebTarget { http://localhost:9998/myPath }

Answer 1

Your methods seem to override some important initialization made in parent JerseyTest. Try to name them differently. E.g.:

@Before
public void setUpChild() { }

@After
public void tearDownChild() { }

Answer 2

I came here because I was using JUnit 5 and it seems that it wasn't seeing the @Before and @After annotations on the JerseyTest setup/tearDown methods. I had to override them and use the new JUnit 5 annotations

public class MyResourceTest extends JerseyTest {
    @BeforeEach
    @Override
    public void setUp() throws Exception {
        super.setUp();
    }

    @AfterEach
    @Override
    public void tearDown() throws Exception {
        super.tearDown();
    }

    @Override
    protected Application configure() {
        return new ResourceConfig(MyResource.class);
    }

    @Test
    public void SHOULD_RETURN_BAD_REQUEST() throws IOException {
        System.out.println(target("myPath"));
        assertEquals(1, 1);
    }
}