Maven 错误: 包 org.junit 不存在

我尝试用 maven 创建 javadoc，但是失败了。

mvn verify

我得到以下错误:

(...)
[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
(···)

在 pom.xml 文件中，我有以下几行:

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

我的本地存储库包含 junit jar 文件:

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$

代码没问题，因为在我的笔记本电脑里，我现在无法访问，我可以运行:

mvn javadoc:javadoc
mvn verify

没有任何问题，而且测试工作在 eclipseIDE 中。

191257 次浏览
小开
最佳答案

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>.

小开

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>
<scope>test</scope>
</dependency>

into <dependencies> node.

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

小开

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:

see JUNIT conflict

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

小开

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>
小开

I solved this by using a combination of some of the above tips and other ideas found elsewhere on Stackoverflow.

Get the currently most recent version of Junit via Maven, by adding this to my pom.xml

<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.9.0-M1</version>
<scope>test</scope>
</dependency>

Specify different source directories for main code and test code in pom.xml

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

However, the most important change was that I had attempted to create some test methods in my main source code, which had this import statements.

import org.junit.jupiter.api.Test;

As soon as I removed all test functionality from the main source files, it all started working properly again.

This results in neater code, because all tests are now clearly separated from the main build.


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