Java 使用Mockito注入模拟Spring存储库会导致NullPointerException

我正在尝试测试一个具有自动连接存储库字段的类

@Component
public class DefaultRuleTester implements RuleTester {

    private static final Logger LOG = LogManager.getLogger(DefaultRuleTester.class);

    @Autowired
    RuleChainRepository ruleChainRepository;

    public DefaultRuleTester() {
    }

    @Override
    public List<ResultChain> test(Entity entity) {
        if (entity == null)
            return Collections.emptyList();
        try {
            return selectAndTestAllRuleChains(entity);
        } catch (InvalidClassException e) {
            LOG.error("Unable to select RuleChains from database.", e);
            return Collections.emptyList();
        }
    }

    protected List<ResultChain> selectAndTestAllRuleChains(Entity entity) throws InvalidClassException {
        Collection<RuleChain> ruleChains = selectRuleChainsFromConnection();
        return testRuleChains(entity, ruleChains);
    }

    private Collection selectRuleChainsFromConnection() throws InvalidClassException {
        Collection<RuleChain> ruleChains = ruleChainRepository.findAll();
        if (ruleChains == null)
            return Collections.emptyList();
        return ruleChains;
    }

    protected List<ResultChain> testRuleChains(Entity entity, Collection<RuleChain> ruleChains) {
        // business logic
    }
}

我尝试在测试设置中使用

MockitoAnnotations.initMocks（this）

，而不是（同时使用

@RunWith（MockitoJUnitRunner.class）

）。我还尝试给

RuleChainRepository

一个

@组件

注释

我在其他地方使用同一组注释来模拟其他组件的同一存储库，我看不出它在这里不起作用的任何原因。我有什么明显的遗漏吗

pom的相关章节：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
</parent>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>RELEASE</version>
</dependency>

org.springframework.boot
spring启动程序父级
2.0.0.1版本
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧起动试验
org.mockito
莫基托磁芯
朱尼特
朱尼特
释放

非常感谢。这就是问题所在

 public void setUp() {
        tester = new DefaultRuleTester();
    }

删除这段代码

---

您正在执行

@InjectMocks

，然后创建一个新对象。因此，tester对象将不会注入存储库模拟。

如果您使用spring，为什么不将@RunWith（SpringRunner.class）与@MockBean结合使用呢？如果您使用MockitoJUnitRunner，您必须自己连接依赖项，比如

tester=new DefaultRuleTester（ruleChainRepository）

@Michal感谢您的建议，我会看看如何使用这个。我特别喜欢这样一个事实，即您可以专门为测试

@限定模拟组件。谢谢，这很有效。我只是想知道为什么我能够在另一个测试类中使用
@InectMocks
，在这个测试类中我实例化了CUT？设置几乎相同。
java.lang.NullPointerException
    at com.remsdaq.resque.officersubscription.entity_controller.DefaultRuleTester.selectRuleChainsFromConnection(DefaultRuleTester.java:30)
    at com.remsdaq.resque.officersubscription.entity_controller.DefaultRuleTester.selectAndTestAllRuleChains(DefaultRuleTester.java:25)
    at com.remsdaq.resque.officersubscription.entity_controller.DefaultRuleTester.test(DefaultRuleTester.java:17)
    at com.remsdaq.resque.officersubscription.entity_controller.DefaultRuleTesterTest.whenTested_shouldReturnGivenResultChains(DefaultRuleTesterTest.java:20)
    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:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    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.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79)
    at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85)
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$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)

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
</parent>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>
<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
</dependency>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>RELEASE</version>
</dependency>

 public void setUp() {
        tester = new DefaultRuleTester();
    }