maven error: package org.junit does not exist

问题:

I'm trying to create the javadoc with maven and it fails. It also fails when doing the verify.

mvn verify

I get the following error:

(...)
    [INFO] -------------------------------------------------------------
    [ERROR] COMPILATION ERROR : 
    [INFO] -------------------------------------------------------------
    [ERROR] /home/miquel/creaveu/createOmegaMatrix/src/main/java/edu/url/salle/gtm/hnm/dataStructures/HFrame.java:[6,23]
package org.junit does not exist
    [ERROR] /home/miquel/creaveu/createOmegaMatrix/src/main/java/edu/url/salle/gtm/hnm/dataStructures/HFrame.java:[6,0]
static import only from classes and interfaces
    (···)

In my pom.xml file I have the following lines:

<dependency>
  <groupId>org.junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.8.2</version>
  <scope>test</scope>
</dependency>

and my local repository contains the junit jar file:

miquel@ubuntu:~/creaveu/createOmegaMatrix$ ls -l /home/miquel/.m2/repository/org/junit/junit/4.8.2/
total 248
**-rw-r--r-- 1 miquel miquel 237344 2012-09-13 11:01 junit-4.8.2.jar**
-rw-r--r-- 1 miquel miquel    236 2012-09-13 11:13 junit-4.8.2-javadoc.jar.lastUpdated
-rw-r--r-- 1 miquel miquel      0 2012-09-13 11:13 junit-4.8.2-javadoc.jar-not-available
-rw-r--r-- 1 miquel miquel    458 2012-09-12 18:35 junit-4.8.2.pom
-rw-r--r-- 1 miquel miquel    236 2012-09-13 11:13 junit-4.8.2-sources.jar.lastUpdated
-rw-r--r-- 1 miquel miquel      0 2012-09-13 11:13 junit-4.8.2-sources.jar-not-available
-rw-r--r-- 1 miquel miquel    163 2012-09-13 11:22 _maven.repositories
miquel@ubuntu:~/creaveu/createOmegaMatrix$

The code is fine because in my laptop, which I have no access now, I van run:

mvn javadoc:javadoc
mvn verify

with no problems, and also the tests work in eclipse IDE.

回答1:

Ok, you've declared junit dependency for test classes only (those that are in src/test/java but you're trying to use it in main classes (those that are in src/main/java).

Either do not use it in main classes, or remove <scope>test</scope>.

回答2:

I fixed this error by inserting these lines of code:

<dependency>
  <groupId>junit</groupId>     <!-- NOT org.junit here -->
  <artifactId>junit-dep</artifactId>
  <version>4.8.2</version>
</dependency>

into <dependencies> node.

more details refer to: http://mvnrepository.com/artifact/junit/junit-dep/4.8.2

回答3:

if you are using Eclipse watch your POM dependencies and your Eclipse buildpath dependency on junit

if you select use Junit4 eclipse create TestCase using org.junit package but your POM use by default Junit3 (junit.framework package) that is the cause, like this picture:

Just update your Junit dependency in your POM file to Junit4 or your Eclipse BuildPath to Junit3

回答4:

In my case, the culprit was not distinguish the main and test sources folder within pom.xml (generated by eclipse maven project)

<build>
    <sourceDirectory>src</sourceDirectory>
    ....
</build>

If you override default source folder settings in pom file, you must explicitly set the main AND test source folders!!!!

<build>
    <sourceDirectory>src/main/java</sourceDirectory>
    <testSourceDirectory>src/test/java</testSourceDirectory>
    ....
</build>