The import org.junit cannot be resolved

Question

I need to solve a Java problem for an interview, and they have sent me the test class. It starts with

import org.junit.Before;

and also has the following syntax at places:

@RunWith(JUnit4.class)
...
@Before
...
@Test

I haven't used Java for a while, so this confuses me a little. I downloaded eclipse and when I tried to compile this test file, there are errors at the import and at the '@' signs. The import error throws:

The import org.junit cannot be resolved.

And the @RunWith is not even recognized, as it tries to resolve it to a type.

What have you searched on the net? You want us to give you a detailed explanation of how can you run a JUnit 4 test case? (Hint: there's this `JUnit4.class` in your code) — Luiggi Mendoza, Feb 27 '13 at 06:28
you need to add junit jar file to the project . You can use junit-dep-4.8.2.jar. Then you can right click and choose run as junit test case — Krushna, Feb 27 '13 at 06:28
Have you added jUnit's jar file to your build path in eclipse? — Pradeep Simha, Feb 27 '13 at 06:28
Just did, I should have just googled this question. Thanks for the help. — SKLAK, Feb 27 '13 at 06:31
Anyone know what to do if you're still getting this error even if JUnit4 *is* on the build path? — pellucidcoder, Oct 24 '17 at 21:23

score 214 · Accepted Answer · edited Jun 23 '22 at 13:08

214

You need to add JUnit library to the classpath of your project. There are several choices to achieve it depending on your development setup.

Command line: In the case of command-line invocations, you will have to add junit.jar to the classpath of your application with java -cp /path/to/junit.jar. Take a look at the answers here.
Using eclipse: Eclipse distributions are bundled with this library and this is how you can use it for your project. Right-click on the eclipse project and navigate:

Properties -> Java Build Path -> Libraries -> Add Library -> JUnit -> JUnit 3/4

In the scenarios where you want to use a different version of the jar, instead of clicking on Add Library above, you should click on Add External Jar and locate the library on the file system.

edited Jun 23 '22 at 13:08

Sae1962

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answered Feb 27 '13 at 06:29

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@NishantShreshth how to add this in a `maven` project? – Kasun Siyambalapitiya Sep 25 '17 at 10:30
I added JUnit 4 via Properties -> Java Build Path, but every now and then Eclipse still shows me this error, though running the tests is possible without problems. Restarting Eclipse resolves the problem - for a while. Any explanation for this? – Thomas W Jan 15 '18 at 13:27
Does not work for me. As soon as the project is modular, all the buttons in the Libraries tab are grey. (With eclipse 2019-09 and java 11.0.4). – Gyro Gearloose Dec 09 '19 at 12:42

score 15 · Answer 2 · edited Jun 23 '22 at 10:21

15

Right-click on the eclipse project and navigate to

Properties -> Java Build Path -> Libraries -> Add Library -> JUnit -> JUnit 3/4

It works for me.

edited Jun 23 '22 at 10:21

Sae1962

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answered Aug 30 '13 at 17:02

fastforward

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score 7 · Answer 3 · answered Dec 13 '17 at 11:01

7

If you use maven and this piece of code is located in the main folder, try relocating it to the test folder.

answered Dec 13 '17 at 11:01

Searene

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@VigneshrajSekarbabu Because people usually set `junit`'s scope as `test`, which means they will only work in the test folder. – Searene Dec 16 '18 at 06:47
Thank you @searene.. I tried to have my TestBase in the src/main/java but then was not able to get the testNG annotations. so moved to src/test/java. But now, i am trying to create a RetryAnalyzer in src/main/java and IRetrAnalyzer is in org.testng which i am not able to get in src/main/java classes. any idea what could solve this ? – Vigneshraj Sekarbabu Dec 16 '18 at 08:53
@VigneshrajSekarbabu One way is to check your test-related dependencies' scope, make sure they are not `test`, so that you could use everything inside `/src/main/java`. – Searene Dec 16 '18 at 10:54

score 6 · Answer 4 · edited May 04 '19 at 08:32

6

If you are using eclipse and working on a maven project, then also the above steps work.

Right-click on your root folder.

Properties -> Java Build Path -> Libraries -> Add Library -> JUnit -> Junit 3/4

Step By Step Instructions here

edited May 04 '19 at 08:32

Mehdi LAMRANI

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answered May 24 '18 at 11:25

sarthakgupta072

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For me this only worked. I was performing remote debugging of my web application, so eclipse had some issues with integrating junit. With regard to maven, yes maven imports junit and will run the tests when we'll run mvn clean install. Not an expert, but this is what I think that happens or atleast happened with me. – sarthakgupta072 Dec 12 '18 at 12:03

score 6 · Answer 5 · answered Jan 18 '20 at 04:45

6

you need to add Junit dependency in pom.xml file, it means you need to update with latest version.

<dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>

answered Jan 18 '20 at 04:45

Veera Reddy

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Thanks. Also the version can be left out – Gilbert Dec 18 '20 at 15:06

score 5 · Answer 6 · edited Jun 23 '22 at 10:54

5

You can easily search for a line like @Test and then use the quick-fix add JUnit 4 library to the build path at this line. I think this is faster than adding JUnit manually to the project.

edited Jun 23 '22 at 10:54

Sae1962

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answered Apr 21 '16 at 08:27

anion

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This does not solve it in my situation. JUnit is perfectly in the path but it keeps on showing the error. – 猫IT Oct 11 '18 at 23:48
1

Works for me ^^ – jumping_monkey Dec 18 '19 at 00:35

score 2 · Answer 7 · edited Jun 23 '22 at 13:08

2

Seems that the JUnit .jar file is not in the path. Also, make sure you are using JDK1.5 or above.

edited Jun 23 '22 at 13:08

Sae1962

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answered Feb 27 '13 at 06:29

zaffargachal

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Not just the jar, OP should run it as a JUnit test (maybe OP will ask how to run the Java class if it doesn't have a `public static void main(String[] args)` – Luiggi Mendoza Feb 27 '13 at 06:30
Didn't know how to link the JUnit. I figured it out. Right click the project name, and link JUnit. Thanks. – SKLAK Feb 27 '13 at 06:31

score 2 · Answer 8 · edited Jul 15 '18 at 13:56

2

In starting code line copy past 'Junit' or 'TestNG' elements will show with Error till you import library with the Project File.

To import Libraries in to project:

Right Click on the Project --> Properties --> Java Build Path --> Libraries -> Add Library -> 'Junit' or 'TestNG'

Add Junit Libraries

edited Jul 15 '18 at 13:56

kiner_shah

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answered Jul 15 '18 at 08:06

oshan Viduranga

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score 2 · Answer 9 · answered Aug 06 '18 at 22:52

2

If you are using Java 9 or above you may need to require the junit dependency in your module-info.java

module myModule {
    requires junit;
}

answered Aug 06 '18 at 22:52

janDro

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i'm pretty sure the issue I face which is the same as the original question is linked to this new module mechanism. Now i did add this line to my existing module-info.java and there is no more red cross in the package explorer but in the source everything remains the same. – 猫IT Oct 12 '18 at 00:14

score 2 · Answer 10 · answered Jul 25 '19 at 20:54

2

If using Maven you can context click and run 'Maven/Update Project...'

answered Jul 25 '19 at 20:54

ABC123

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When I do this, module-info.java is filled with errors and lambdas are not recognized. Eclipse/maven have reverted the library and java version to 1.5, and I do have org.apache.maven.plugins maven-compiler-plugin 3.8.0 11 in my pom – Gyro Gearloose Dec 09 '19 at 12:37

score 1 · Answer 11 · answered Feb 07 '18 at 06:49

1

In case you want to create your own Test Class. In Eclipse go to File -> New -> J Unit Test Case. You can then choose all your paths and testing class setup within the wizard pop-up.

answered Feb 07 '18 at 06:49

Dharu Ravi

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score 1 · Answer 12 · answered Jun 22 '19 at 07:34

1

When you add TestNG to your Maven dependencies , Change scope from test to compile.Hope this would solve your issue..

answered Jun 22 '19 at 07:34

Ajay

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Kindly consider putting such suggestions as comments. – Amit Kumar Lal Jun 22 '19 at 07:56

score 0 · Answer 13 · answered Apr 30 '21 at 09:17

0

I had the same problem right now. My solution: add JUnit to the pom.xml AND remove JUnit from the eclipse project properties (Java Build Path/Libraries).

answered Apr 30 '21 at 09:17

Ralf Renz

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Hiran Kariyawasam · Answer 14 · 2022-02-13T02:43:38.320

If you use Maven with Eclipse then You need to follow the below steps.

1). Add Junit dependency to the pom.xml file

<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>

Note : Please get the latest from the following link https://mvnrepository.com/artifact/junit/junit

2).On your test class (Ex. AdditionTest.class), you need to annotate with @Test on your test method (Ex. testAdd() )

Note : The Test annotation tells JUnit that the public void method to which it is attached can be run as a test case.

public class AdditionTest {

@Test
public void testAdd()
{

// Test code here...

The moment/ the first time you annotate as "@Test" the IDE asks whether you need to Add Junit jar files to Class path. Once you accept this it will add the Junit jar file into the class path.

With this you can achieve the following imports import org.junit.Test; import static org.junit.Assert.*; Regards

score 0 · Answer 15 · answered Mar 26 '23 at 18:48

VSCode 2023 (Java v17.0.3 & junit v4.12)

For anyone having this issue in VSCode, I recommend checking this short video on how you perform Testing Java with Visual Studio Code: code.visualstudio.com/docs/java/java-testing/enable-tests

For full documentation check out the official VSCode documentation: code.visualstudio.com/docs/java/java-testing

...and don't forget to add/enable the Java extension in VSCode

score -3 · Answer 16 · answered Sep 18 '18 at 07:39

-3

Update to latest JUnit version in pom.xml. It works for me.

answered Sep 18 '18 at 07:39

RKM

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this answer would be better with more details on how to do that - i.e. what code to paste, how to figure out the latest version, how to search for the code online to get the right text, etc. – LightCC Dec 21 '18 at 19:15

The import org.junit cannot be resolved

16 Answers16

VSCode 2023 (Java v17.0.3 & junit v4.12)

Linked