Tukukkk

I created a Spring Boot 2 application with Junit 4 and Mockito. When I test some method. there will be an exception like this :

java.lang.NullPointerException
at com.xxx.service.SurveyServiceTest.getSurveyList(SurveyServiceTest.java:41)
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.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)

Here is my test code

@RunWith(MockitoJUnitRunner.class)

public class SurveyServiceTest {



    @MockBean

    SurveyRepository repostory;



    @InjectMocks

    SurveyService service;



    @Test

    public void getSurveyList() {

        when(repostory.findAll()).thenReturn(Arrays.asList( new Survey(new Long(1),101,"Test1"),

                new Survey(new Long(2),102,"Test2")  ));

        assertTrue(service.getSurveyList().size() >0);

    }

}

SuveryService.java

@Service

public class SurveyService {

    @Autowired

    private SurveyRepository repostory;



    public List<Survey> getSurveyList() {

        return repostory.findAll();

    }



    public Optional<Survey> getSurveyById() {

        return repostory.findById((long) 1);

    }



    public Survey add() {

        Survey survey = new Survey();

        survey.setSurveyID(1);

        survey.setSurveyContent("ddddd");



        return repostory.save(survey);

    }



    public Survey update() {

        Survey survey = new Survey();

        survey.setSurveyID(1);

        survey.setSurveyContent("gggg1");

        return repostory.save(survey);

    }



    public void delete() {

        repostory.deleteById((long) 1);

    }



    public List<Survey> findBySurveyContent() {

        return repostory.findBySurveyContent("gggg1");

    }



    public int updateBySurveyId(){

        return repostory.updateBySurveyId("hhhhhh", 1);

    }

}

SurveyRepository.java

    public interface SurveyRepository  extends JpaRepository<Survey, Long> {



    public List<Survey> findBySurveyContent(String surveyContent);



    @Query(value = "update XXX_DATA.SURVEYS set SURVEYCONTENT=? where SURVEYID=?",nativeQuery = true)  

    @Modifying

    @Transactional

    public int updateBySurveyId(String surveyContent,int surveyId);

}

Survey.java

@Entity

@Table(name="SURVEYS", schema="XXX_DATA")

public class Survey{

    @Id

    @GeneratedValue(strategy = GenerationType.IDENTITY)

    @Column(name = "ID")  

    private Long id; 



    @Column(name = "SURVEYID")  

    private Integer surveyID;



    @Column(name = "SURVEYCONTENT")  

    private String surveyContent;



    public Survey(){



    }



    public Survey(Long id,Integer surveyID,String surveyContent){

        this.id = id;

        this.surveyID = surveyID;

        this.surveyContent = surveyContent;

    }



    public Long getId() {

        return id;

    }



    public void setId(Long id) {

        this.id = id;

    }



    public Integer getSurveyID() {

        return surveyID;

    }



    public void setSurveyID(Integer surveyID) {

        this.surveyID = surveyID;

    }



    public String getSurveyContent() {

        return surveyContent;

    }



    public void setSurveyContent(String surveyContent) {

        this.surveyContent = surveyContent;

    }

}

POM.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 

http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>



<groupId>com.xxx.test</groupId>

<artifactId>xxx-service</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>war</packaging>



<name>xxx-service</name>

<description>XXX Service</description>



<parent>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-parent</artifactId>

    <version>2.0.1.RELEASE</version>

    <relativePath/> <!-- lookup parent from repository -->

</parent>



<properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

    <java.version>1.8</java.version>

</properties>



<repositories>

    <repository>

        <id>maven-repository</id>

        <url>file:///${project.basedir}/maven-repository</url>

    </repository>

    <repository>

        <id>com.ibm.db2.jcc</id>

        <url>https://artifacts.alfresco.com/nexus/content/repositories/public/</url>

    </repository>

</repositories>



<dependencies>

    <dependency>

        <groupId>com.ibm.db2.jcc</groupId>

        <artifactId>db2jcc4</artifactId>

        <version>10.1</version>

    </dependency>

    <dependency>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-data-jpa</artifactId>

    </dependency>



    <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>

        <scope>test</scope>

    </dependency>



    <dependency>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-security</artifactId>

    </dependency>

    <dependency>

        <groupId>org.springframework.security</groupId>

        <artifactId>spring-security-test</artifactId>

        <scope>test</scope>

    </dependency>

    <dependency>

        <groupId>com.ibm.watson.developer_cloud</groupId>

        <artifactId>java-sdk</artifactId>

        <version>5.1.1</version>

    </dependency>

    <dependency>

        <groupId>org.apache.httpcomponents</groupId>

        <artifactId>httpclient</artifactId>

     </dependency>

     <dependency>

        <groupId>com.ibm.swat.password</groupId>

        <artifactId>cwa2</artifactId>

        <version>2.3.5.3</version>

      </dependency>

      <dependency>

        <groupId>org.apache.poi</groupId>

        <artifactId>poi-ooxml</artifactId>

        <version>3.15</version>

      </dependency> 

      <dependency> 

        <groupId>org.apache.poi</groupId>

        <artifactId>poi-ooxml-schemas</artifactId>

        <version>3.15</version>

      </dependency>

    <dependency>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-test</artifactId>

        <scope>test</scope>

    </dependency>

</dependencies>



<build>

    <plugins>

        <plugin>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-maven-plugin</artifactId>

        </plugin>

        <plugin>

            <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-surefire-plugin</artifactId>

                <configuration>

                  <skip>true</skip>

                </configuration>

        </plugin>

    </plugins>

</build>

I referenced this article Mockito NullPointerException, but the issue still existed.
Any help will be appcirated.

@MockBean is a Spring annotation, which only has an effect if you create a Spring boot integration test, run with the SpringRunner.

You have a unit test here, run with MockitoJUnitRunner, and you just want Mockito to create your mock repository. The correct annotation is @Mock.

You sould do that :

@RunWith(MockitoJUnitRunner.class)

public class SurveyServiceTest {



    @Mock// and not MockBean

    SurveyRepository repostory;



    @InjectMocks

    SurveyService service;



    @Test

    public void getSurveyList() {

        when(repostory.findAll()).thenReturn(Arrays.asList( new Survey(new Long(1),101,"Test1"),

                new Survey(new Long(2),102,"Test2")  ));

        assertTrue(service.getSurveyList().size() >0);

    }

}