blocks|key|926101|text|您确定您的测试类在build文件夹中吗？您将在单独的JVM+(fork=true)中调用junit，因此工作文件夹可能会在调用过程中更改，并且由于构建是相对的，这可能会导致问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926102|使用-verbose或-debug开关从命令行(而不是Eclipse)运行ant，以查看调用junit的详细类路径/工作目录，如果您仍然不能解决此问题，请将结果发送回此处。|926103|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Are you sure your test class is in the build folder? You're invoking junit in a separate JVM (fork=true) so it's possible that working folder would change during that invocation and with build being relative, that may cause a problem.

Run ant from command line (not from Eclipse) with -verbose or -debug switch to see the detailed classpath / working dir junit is being invoked with and post the results back here if you're still can't resolve this issue.

blocks|key|709925|text|在类路径中找不到ConfigurationManagerTest。确保ConfigurationManagerTest.class文件在类路径上可用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|709926|如果它没有被成功编译，或者如果它是在您还没有告诉Eclipse项目应该在类路径上的目录中创建的，那么它可能不存在。|709927|假设您已经将测试类放在一个单独的文件夹中，请确保它显示在"Package+Explorer“视图(而不是"Navigator”视图)中。|709928|在项目属性"Java+Build+Path“和"+source”选项卡下，您还可以看到是否包含用于构建的源文件夹以及生成.class文件的位置。|709929|entityMap^0|8|O|Z|U|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|U|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|M|$]]

<code>ConfigurationManagerTest</code> is not being found on your classpath. Ensure that the <code>ConfigurationManagerTest.class</code> file is available on your classpath. 

It might not exist if it wasn't successfully compiled or if it's being created in a directory that you haven't told the Eclipse project should be on the classpath. 

Assuming that you've put your test classes in a separate folder, make sure that it shows up in the "Package Explorer" view (rather than the "Navigator" view). 

Under the project properties, "Java Build Path" and the "Source" tab, you can also see if the source folder is included for building as well as where the .class files are generated.

blocks|key|926197|text|另一个可能的问题是缺少构建器(它将阻止您的.class文件被构建)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926198|检查您的.project文件是否包含以下行|926199|<buildSpec>
++<buildCommand>
++++<name>org.eclipse.jdt.core.javabuilder</name>
++++<arguments>
++++</arguments>
++</buildCommand>
</buildSpec>
<natures>
++<nature>org.eclipse.jdt.core.javanature</nature>
</natures>|code-block|syntax|javascript|926200|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Another possible problem is a missing builder (it will prevent from your .class file from being built).

Check that your .project file has the following lines

<pre><code>&lt;buildSpec&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;org.eclipse.jdt.core.javabuilder&lt;/name&gt;
 &lt;arguments&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
&lt;/buildSpec&gt;
&lt;natures&gt;
 &lt;nature&gt;org.eclipse.jdt.core.javanature&lt;/nature&gt;
&lt;/natures&gt;
</code></pre>

blocks|key|710048|text|上面盖伊答案的一个变体，涉及到额外的构建者。假设您配置了一个Ant构建器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710049|<buildSpec>
++++<buildCommand>
++++++++<name>org.eclipse.jdt.core.javabuilder</name>
++++++++<arguments>
++++++++</arguments>
++++</buildCommand>
++++<buildCommand>
++++++++<name>org.eclipse.ui.externaltools.ExternalToolBuilder</name>
++++++++<arguments>
++++++++++++<dictionary>
++++++++++++++++<key>LaunchConfigHandle</key>
++++++++++++++++<value>&lt;project&gt;/.externalToolBuilders/myprojectantlaunch.launch</value>
++++++++++++</dictionary>
++++++++</arguments>
++++</buildCommand>
</buildSpec>|code-block|syntax|javascript|710050|如果Ant构建和Eclipse构建具有不同的输出位置，那么Eclipse可能无法在类路径上定位测试类。对于Ant构建器，还要检查干净、自动、手动和清理后构建的配置目标，以确保构建单元测试的目标是被调用的。|710051|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

A variation on Guy's answer above, involving additional builders. Say you have an Ant builder configured:

<pre><code>&lt;buildSpec&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;org.eclipse.jdt.core.javabuilder&lt;/name&gt;
 &lt;arguments&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;org.eclipse.ui.externaltools.ExternalToolBuilder&lt;/name&gt;
 &lt;arguments&gt;
 &lt;dictionary&gt;
 &lt;key&gt;LaunchConfigHandle&lt;/key&gt;
 &lt;value&gt;&amp;lt;project&amp;gt;/.externalToolBuilders/myprojectantlaunch.launch&lt;/value&gt;
 &lt;/dictionary&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
&lt;/buildSpec&gt;
</code></pre>

If the Ant build and Eclipse build have differing output locations, Eclipse may not be able to locate the test class on the classpath. In the case of an Ant builder, also check the configured targets for clean, auto, manual and after-clean builds, to ensure that the target which builds the unit tests is called.

blocks|key|926309|text|我遇到了这个问题，很难意识到哪里出了问题。该项目有一个包含某些错误的依赖项目，这导致生成无法执行。当我删除这个依赖问题时，项目就像预期的那样构建了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926310|附注:我正在做一个有许多编译错误的项目，因为我们正在移植一个从Delphi转换到Java的应用程序，所以我一开始并不关心编译错误，这就是为什么我花了一些时间来找出问题的原因。|926311|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had this problem and it was kind of tricky to realise what was wrong. The project had a dependency project with some error, which stopped the build from execute. When I remove this dependency problem, the project was built as expected.

Ps.: I am working on a project that has many compilation errors, because we are porting an application that was converted from Delphi to Java, so I didn't care to the compilation error at the beginning, that's why it took me some time to find out the problem.

blocks|key|926402|text|我尝试了这里描述的所有答案，但都不起作用，但找到了这个thread，其中slomek以一种非常简单的方式解决了问题。只需转到项目->属性-->+java构建路径。然后通过点击右上角的底部将Junit移动到顶部。然后一切都编译得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|926403|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/11381068/class-not-found-exception-when-running-junit-test^0|R|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I tried all the answers described here but none worked, but found this <a href="https://stackoverflow.com/questions/11381068/class-not-found-exception-when-running-junit-test">thread</a> where slomek solves the problem in a very easy manner. Just go to project -> properties --> java build path. Then move Junit to the top by hitting the up bottom to the right. Then everything compiles just fine.

blocks|key|926463|text|检查属性->+java构建路径->库。应该没有错误，在我的情况下，在maven中有错误。一旦我将所需的jar放入maven+repo中，它就能正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926464|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

check properties->java build path -> libraries. there should be no errors, in my case there was errors in the maven. once I put the required jar in the maven repo, it worked fine

blocks|key|926552|text|右键单击资源管理器中的项目:+Build+Path、Explorer和Export+->，选择JRE+System+Library+jdk，然后单击底部按钮。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926553|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Right click the project in the Explorer: Build Path -> Order and Export -> Select JRE System Library [jdk] and click Bottom button.

blocks|key|926637|text|对我来说起作用的是删除了测试的运行配置。然后右键单击testclass并单击run+as+junit+test。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926638|现在它为我重新创建了一个正确的运行配置。|926639|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

what worked for me is to remove the runconfiguration of the test. Then right click the testclass and click run as junit test. 

now it recreates a correct run config for me.

blocks|key|710508|text|还有另一种变种。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710509|不知何故，我以前工作的测试类似乎是从其他位置运行的；当我运行测试时，我的编辑将不会执行。|710510|我发现我的${project_loc}src/test/java文件的输出文件夹不是我所期望的。它被无意中设置为${project_loc}目标/类。我在项目属性、Java+Build+Path、Source选项卡中正确设置了它。|710511|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Yet another variation. 
Somehow, my formerly working test classes appeared to be running from some other location; my edits would not execute when I ran the tests. 

I found that the output folder for my ${project_loc}src/test/java files was not what I expected. It had inadvertently been set to ${project_loc}target/classes.
I set it properly in project properties, Java Build Path, Source tab.

blocks|key|710566|text|如果你有一个maven项目，试着运行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|710567|mvn+clean+compile|code-block|syntax|javascript|710568|然后在eclipse中清理和构建你的项目。|710569|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you have a maven project try to run:

<pre><code>mvn clean compile
</code></pre>

and then in eclipse clean &amp; build your project.

blocks|key|926772|text|我在调试Junit的Eclipse+Helios上也遇到了类似的问题。我的问题几乎没有什么不同，因为我能够成功地运行JUNITs，但是当我在调试相同的Junits时获得ClassNotFoundException。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926773|我在Stackoverflow.com和其他地方的论坛上尝试了所有不同的解决方案，但似乎都不起作用。在与这些问题纠缠了近两天之后，我终于找到了解决方案。|926774|如果所有解决方案似乎都不起作用，只需删除在您的工作区中创建的.metadata文件夹。这将增加导入项目和您所做的各种配置的额外开销，但这些肯定会解决这些问题。|926775|希望这些能有所帮助。|926776|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I had the similar problem with my Eclipse Helios which debugging Junits. My problem was little different as i was able to run Junits successfully but when i was getting ClassNotFoundException while debugging the same JUNITs.

I have tried all sort of different solutions available in Stackoverflow.com and forums elsewhere, but nothing seem to work. After banging my head with these issue for close to two days, finally i figured out the solution to it.

If none of the solutions seem to work, just delete the .metadata folder created in your workspace. This would create an additional overhead of importing the projects and all sorts of configuration you have done, but these will surely solve these issue.

Hope these helps.

blocks|key|926810|text|在"Package+Explorer“视图中，右键单击您的测试类，然后"Build+Path">>"Include"，它应该是OK的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926811|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In "Package Explorer" view, Right click your test class, then "Build Path">>"Include", it should be OK.

blocks|key|926905|text|我也面临着同样的例外，互联网上的解决方案都没有帮到我。我的项目包含多个模块。我的Junit代码驻留在Web模块中。它引用的是客户端模块的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|926906|最后，我尝试了:右键单击(Web模块)项目-->构建路径-->源代码选项卡-->链接源代码-->添加src文件位置(客户端模块)|926907|就是这样！它像护身符一样起作用希望它能帮上忙|926908|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I too faced the same exception, none of the solutions over internet helped me out.
my project contains multiple modules. My Junit code resides in Web module. And it's referring to client module's code.

Finally , I tried :
Right click on (Web module) project -->build path--> source tab--> Link source --> added the src files location (Client module's)

Thats it! It worked like a charm 
Hope it helps

blocks|key|926972|text|我收到这个错误是因为我最近创建了一个新的工作区，并且我的“已安装JRE”没有正确设置。确保在Preferences+->+Java+->+Installed+JREs中选择了JDK的根文件夹。由于某些原因，我在新工作空间中的默认设置是JRE。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|926973|entityMap^0|1A|11|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I received this error because I had recently created a new workspace and my "Installed JREs" were not set up correctly. Make sure in <code>Preferences -&gt; Java -&gt; Installed JREs</code> 
the root folder of your JDK is selected. The default for me in a new workspace was a JRE for some reason.

blocks|key|927061|text|我知道这个问题很久以前就已经回答了，但是答案并没有为我解决这个问题，但是，我只是从buildpath设置中的源代码中删除了所有内容并重新添加了它们|type|unstyled|depth|inlineStyleRanges|entityRanges|data|927062|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I know this has been already answered a long time ago but the answer didnt fix it for me but, I just removed everything from the sources in the buildpath settings and re-added them

blocks|key|927177|text|我遇到了这个问题，在我的例子中，问题在于编译，我使用的是maven，测试类没有编译。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|927178|我通过执行maven+install修复了这个问题(它会编译所有的文件)，你也可以检查其他原因，避免测试编译，比如你的“运行配置”是否跳过了测试以节省时间。|927179|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had this problem, in my case the problem relies in the compilation, I am using maven and test classes didn't compile.

I fixed it by doing a maven install (it compiles all the files), also you can check for other reasons, that avoid test to compile like if your "run configurations" is skipping the tests to save time.

blocks|key|927327|text|请确保Java+Build+Path选项卡中的输出文件夹如下所示，这将确定.class文件generated.Then清理项目的位置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|927328|​|927329|📷|atomic|927330|927331|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/8d6ac7650fdb7baf09b68054f60ce5fc.png|imageAlt^0|3|F|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|K|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]]]

Please make sure the output folder in <code>Java Build Path</code> tab set as like below,which would determine where the .class file are generated.Then clean the project.

<a href="https://i.stack.imgur.com/PLWs6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PLWs6.png" alt="enter image description here"></a>

blocks|key|711182|text|上面提到的解决方案对我不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|711183|我只是通过关闭并重新打开IDE来重新启动它。|711184|然后错误消失了，现在它工作得很好。|711185|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

The above mentioned solutions didn't work for me.

I just restarted my IDE by closing it and reopening it.

And then error disappeared and its working fine now.

blocks|key|927406|text|您可能需要执行以上操作的组合才能解决此问题。当我这样做时，我通常会得到这个错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|927407|mvn+clean+install|offset|length|style|CODE|927408|并看到一个编译错误，阻止我的测试完全编译。|927409|假设上面解决的问题已经得到解决，请尝试单击Project、Clean，然后清除包含您要运行的测试的项目。另外，还要确保选中了自动构建。|927410|entityMap^0|0|0|H|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

You may need to do a combination of the above to resolve this problem. I normally get this error when I do
<code>mvn clean install</code>
and see a compile error preventing the my tests from fully compiling.
Assuming the issues resolved by the above have been dealt with, try clicking Project, Clean, and clean the project which contains the test you want to run. Also make sure Build Automatically is checked.

I'm trying to run my junit test (to verify that a properties file loads correctly) but 
I get <code>ClassNotFoundException</code> although the class is there and all required libraries are there too.

Here it is the error I get :

<pre><code>Class not found ConfigurationManagerTest java.lang.ClassNotFoundException: ConfigurationManagerTest
 at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClass(RemoteTestRunner.java:693)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClasses(RemoteTestRunner.java:429)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
</code></pre>

any ideas on how to fix this ?

Thanks.

JUNIT Test class in Eclipse - java.lang.ClassNotFoundException

单元测试

Eclipse

Java

我正在尝试运行我的junit测试(以验证属性文件是否正确加载)，但是我得到了ClassNotFoundException，尽管类已经存在，所有需要的库也都存在。下面是我得到的错误：Class not found ConfigurationManagerTest                              ...

问Eclipse中的JUNIT测试类- java.lang.ClassNotFoundException
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