How I can resolve this problem (Class<SpringJUnit4ClassRunner> cannot be resolved to a type)? - spring

Question

I realized a simple projetc using spring and maven, my project contains an interface and 3 classes and the pom.xml file
Interface : CompactDisc.java
3 classes :
SgtPeppers.java that implements the CompactDisc interface
CDPlayersConfig.java is an empty class and contains the annotations of automatic scan
CDPlayersTest.java is a test class to test if the spring container works.
My problem is with #RunWith(SpringJUnit4ClassRunner.class) and #ContextConfiguration(classes=CDPlayersConfig.class), Eclipse suggests this proposition for the first annotation Class cannot be resolved to a type and it doesn't understand the second annotation.
You find here the code :
CompactDisc.java
package soundsystem;
public interface CompactDisc {
void play();
}
SgtPeppers.java
package soundsystem;
import org.springframework.stereotype.Component;
#Component
public class SgtPeppers implements CompactDisc{
private String title = "Sgt. Pepper's Lonely Hearts Club Band";
private String artist = "The Beatles";
public void play() {
System.out.println("Playing " + title + "by"+ artist);
}
}
CDPlayersConfig.java
package soundsystem;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
#Configuration
#ComponentScan
public class CDPlayersConfig {
}
CDPlayerTest.java
package soundsystem;
import static org.junit.Assert.assertNotNull;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.jta.SpringJtaSynchronizationAdapter;
#RunWith(SpringJUnit4ClassRunner.class)//Here is my problem
#ContextConfiguration(classes=CDPlayersConfig.class)//Here is my problem
public class CDPlayerTest {
#Autowired
private CompactDisc cd;
#Test
public void cdShouldNotBeNull() {
assertNotNull(cd);
}
}
Dependencies im the pom file
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.0.5.RELEASE</version>
<scope>test</scope>
</dependency>

Answer 1

In Eclipse
Right Click on your Project
Select Maven
Select Update Project
Tick
Update project config from pom.xml
Refresh workspace
Clean projects
After doing that the required libraries should be available to Eclipse and you should be able to import the classes as required.

Answer 2

I can't see
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.ContextConfiguration;
in your import section. Also, maybe you should use SpringRunner.class instead of SpringJUnit4ClassRunner.class

Answer 3

Control+click on the class. Eclipse will open the file. Copy the package name. Create a new import statement and paste the package name + the class name. Problem solved.
If Eclipse does not open the file when you control+click, you don't have it on your class path or imported correctly.

Answer 4

You are missing the imports (import org.springframework...) for SpringJUnit4ClassRunner and ContextConfiguration. That's why they are not recognized.

Answer 5

You have to add dependency:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.9.RELEASE</version>
</dependency>
And then
import org.springframework.test.context.ContextConfiguration;

Answer 6

It's working in my Gradle project after complete some steps.
1st: Add dependency in build.gradle file ->
testImplementation 'junit:junit:4.13.2'
implementation 'org.springframework:spring-test:4.0.0.RELEASE'
2nd: Clean Gradle project using IDE or using command prompt -> Open command prompt -> Go to project location c:\gradle_projects\test_gradle>gradlew clean build -> Enter
3rd: Refresh Gradle project -> Open command prompt -> Go to project location c:\gradle_projects\test_gradle>gradlew --refresh-dependencies -> Enter
4th: Go to IDE -> right-click on project name -> Gradle -> Refresh Gradle Project
-> finally download jar files and import class