Junit Tests with Spring Boot Actuator дает исключение

Question

Когда я включаю Actuators в моем приложении Spring Boot, мои тесты Junit завершились с ошибкой NullPointer Exception. Приводы работают нормально, и тесты отлично работали, прежде чем добавить артефакт исполнительного механизма в файл pom.xml.

Похоже,

@MockBean 
MailSender mailSender; 

вызывает проблему

Мой pom.xml файл:

<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-actuator</artifactId> 
</dependency> 
<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-test</artifactId> 
    <scope>test</scope> 
</dependency> 

Мой Тест:

@RunWith(SpringRunner.class) 
@SpringBootTest 
@AutoConfigureTestDatabase 
public class MailServiceTest extends CommonServiceTest { 

    @Autowired 
    MailService mailService; 

    @MockBean 
    MailSender mailSender; 

    private static final String TO = "user@test.com"; 
    private static final String SUBJECT = "Subject"; 
    private static final String TEXT = "Text"; 
    private static final String TOKEN = "1234"; 

    @Value("${app.email.from}") 
    private String fromEmail; 

    @Value("${app.email.support}") 
    private String supportEmail; 

    private ArgumentCaptor<SimpleMailMessage> simpleMailMessageCaptor; 

    @Override 
    public void initObjects() { 
     simpleMailMessageCaptor = ArgumentCaptor.forClass(SimpleMailMessage.class); 
    } 

    @Override 
    public void initMocks() { 

    } 

    @Test 
    public void sendMailTest() { 

     mailService.sendMail(TO, SUBJECT, TEXT); 

     verify(mailSender).send(simpleMailMessageCaptor.capture()); 

     assertEquals(TO, simpleMailMessageCaptor.getValue().getTo()[0]); 
     assertEquals(SUBJECT, simpleMailMessageCaptor.getValue().getSubject()); 
     assertEquals(fromEmail, simpleMailMessageCaptor.getValue().getFrom()); 
     assertEquals(TEXT, simpleMailMessageCaptor.getValue().getText()); 
    } 

} 

Ошибка:

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$2.evaluate(ParentRunner.java:268) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191) 
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117) 
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) 
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262) 
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mailHealthIndicator' defined in class path resource [org/springframework/boot/actuate/autoconfigure/HealthIndicatorAutoConfiguration$MailHealthIndicatorConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.health.HealthIndicator]: Factory method 'mailHealthIndicator' threw exception; nested exception is java.lang.NullPointerException 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1128) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1023) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) 
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) 
    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) 
    ... 29 more 
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.health.HealthIndicator]: Factory method 'mailHealthIndicator' threw exception; nested exception is java.lang.NullPointerException 
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) 
    ... 46 more 
Caused by: java.lang.NullPointerException 
    at org.springframework.boot.actuate.autoconfigure.CompositeHealthIndicatorConfiguration.createHealthIndicator(CompositeHealthIndicatorConfiguration.java:42) 
    at org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$MailHealthIndicatorConfiguration.mailHealthIndicator(HealthIndicatorAutoConfiguration.java:334) 
    at org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$MailHealthIndicatorConfiguration$$EnhancerBySpringCGLIB$$25b5897.CGLIB$mailHealthIndicator$0(<generated>) 
    at org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$MailHealthIndicatorConfiguration$$EnhancerBySpringCGLIB$$25b5897$$FastClassBySpringCGLIB$$da72ce26.invoke(<generated>) 
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) 
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) 
    at org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration$MailHealthIndicatorConfiguration$$EnhancerBySpringCGLIB$$25b5897.mailHealthIndicator(<generated>) 
    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.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) 
    ... 47 more 

Answer 1

Единственное решение, которое я нашел в том, чтобы добавить свойства самого теста:

@RunWith(SpringRunner.class) 
@SpringBootTest 
@AutoConfigureTestDatabase 
// Otherwise I have a NullPointer, don't know why 
@TestPropertySource(
     properties = {"management.health.mail.enabled=false"}) 
public class MailServiceTest extends CommonServiceTest { 

Answer 2

Это, как правило, является симптомом того, некоторые прокси-класс оборачивать ваш JavaMailSenderImpl.

Проверьте, что вы используете интерфейсы в ваших зависимостях, например. JavaMailSender, и вы увидите, что HealthIndicatorAutoConfiguration.MailHealthIndicatorConfiguration находками и заселяет mailSenders:

public MailHealthIndicatorConfiguration(
     ObjectProvider<Map<String, JavaMailSenderImpl>> mailSenders) { 
    this.mailSenders = mailSenders.getIfAvailable(); 
}