Spring – How to use random port for JUNIT Testcases using Spring Boot 1.4.0 +

junit4springspring-bootspring-testspring-test-mvc

I am using spring boot 1.3.6 and my JUNIT Test cases are running fine, after upgrading to spring boot 1.4.0 and attempting to remove deprecated classes is throwing me error

My JUNITCLASS with 1.3.x

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
@WebAppConfiguration
@IntegrationTest({"server.port=0"})
public class CustomerControllerIT {

    @Value("${local.server.port}")
    private int port;
    private URL base;
    private RestTemplate template;

    @Autowired
    private DataBuilder dataBuilder;

    @Autowired
    private CustomerRepository customerRepository;

    private static final String JSON_CONTENT_TYPE = "application/json;charset=UTF-8"; 


    @Before
    public void setUp() throws Exception {
        this.base = new URL("http://localhost:" + port + "/rest/customers");
        template = new TestRestTemplate();      

        /* remove and reload test data */
        customerRepository.deleteAll();     
        dataBuilder.createCustomers().forEach(customer -> customerRepository.save(customer));       
    }

    @Test
    public void getAllCustomers() throws Exception {
        ResponseEntity<String> response = template.getForEntity(base.toString(), String.class);     
        assertThat(response.getStatusCode(), equalTo(HttpStatus.OK));

        List<Customer> customers = convertJsonToCustomers(response.getBody());      
        assertThat(customers.size(), equalTo(3));       
    }

private List<Customer> convertJsonToCustomers(String json) throws Exception        {        
    ObjectMapper mapper = new ObjectMapper();
    return mapper.readValue(json, TypeFactory.defaultInstance().constructCollectionType(List.class, Customer.class));
}
}

MyClass with 1.4.0

Updates done

Removed deprecated TestRestTemplate with spring suggested one
Running with SpringRunner instead of SpringJUnit4ClassRunner
Replaced @SpringApplicationConfiguration(classes = Application.class) with @SpringBootTest(classes = Application.class , webEnvironment=WebEnvironment.RANDOM_PORT)

After Changes

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class , webEnvironment=WebEnvironment.RANDOM_PORT)
@WebAppConfiguration
public class CustomerControllerIT {

    @Value("${local.server.port}")
    private int port;
    private URL base;
    private TestRestTemplate template;

    @Autowired
    private DataBuilder dataBuilder;

    @Autowired
    private CustomerRepository customerRepository;

    private static final String JSON_CONTENT_TYPE = "application/json;charset=UTF-8"; 


    @Before
    public void setUp() throws Exception {
        this.base = new URL("http://localhost:" + port + "/rest/customers");
        template = new TestRestTemplate();      

        /* remove and reload test data */
        customerRepository.deleteAll();     
        dataBuilder.createCustomers().forEach(customer -> customerRepository.save(customer));       
    }
}

Now I am receiving NPE when i try to run JUNIT Testcase, How can I set the random port to make my JUNIT test case running in Spring Boot 1.4.0 +?

Update :

Here is the stacktrace of the issue

java.lang.IllegalStateException: Failed to load ApplicationContext
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
    at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
    at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189)
    at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131)
    at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.NullPointerException
    at org.springframework.test.context.web.socket.MockServerContainerContextCustomizer.customizeContext(MockServerContainerContextCustomizer.java:38)
    at org.springframework.boot.test.context.SpringBootContextLoader$ContextCustomizerAdapter.initialize(SpringBootContextLoader.java:270)
    at org.springframework.boot.SpringApplication.applyInitializers(SpringApplication.java:633)
    at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:347)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:311)
    at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:111)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
    at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
    ... 25 more

Best Answer

From Spring Blog I have updated your latest sample.

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class, webEnvironment=WebEnvironment.RANDOM_PORT)
public class CustomerControllerIT {
    @Autowired
    private TestRestTemplate template;

    @Autowired
    private DataBuilder dataBuilder;

    @Autowired
    private CustomerRepository customerRepository;

    private static final String JSON_CONTENT_TYPE = "application/json;charset=UTF-8"; 


    @Before
    public void setUp() throws Exception {
        /* remove and reload test data */
        customerRepository.deleteAll();     
        dataBuilder.createCustomers().forEach(customer -> customerRepository.save(customer));       
    }

    @Test
    public void getAllCustomers() throws Exception {
        ResponseEntity<String> response = template.getForEntity("/rest/customers", String.class);     
        assertThat(response.getStatusCode(), equalTo(HttpStatus.OK));

        List<Customer> customers = convertJsonToCustomers(response.getBody());      
        assertThat(customers.size(), equalTo(3));       
    }
}

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Spring 3 and JUnit 4 (autowiring)

First of all, the WEB-INF folder should never be in the classpath; it should be in the file system of the project. So if you use the Maven project structure, that folder would be located relative to the root of your project (i.e., src/main/webapp/WEB-INF). In that case you would want to declare an XML configuration file in that folder as a file system resource like this:

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Secondly, if this is a test configuration file, you should not store it under WEB-INF. Instead, you should store it in the classpath. Following the Maven project structure, this would be src/test/resources/application-context.xml, in which case you would use the following declaration in your test:

@ContextConfiguration("/application-context.xml")

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... whichever your prefer, but note that they are equivalent.

Regards and thanks,

Sam

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Then from the code behind :

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