blocks|key|1755012|text|右键单击src目录并选择标记目录作为>源根。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1755013|entityMap^0|4|3|C|6|J|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Right click on src directory and select option Mark Directory As > Sources Root.

blocks|key|2512122|text|有一个Intellij错误，它会导致源代码左侧那个小小的绿色运行按钮(在红色圆圈断点所在的同一列上)的间断消失。是的，你可以右键点击鼠标，并可以通过菜单运行，，但我们喜欢那个小绿色按钮，所以把它拿回来！！有时，我看到这个绿色的朋友，突然它神秘地消失了，然后又回来了。我做了所有的事情，如rm+-rf+.idea和其他奇怪的东西，但从来没有任何解释来解释消失的绿色按钮和它突然出现间歇性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|2512123|我正在起草这个答案，因为以上所有的答案似乎都声称，我们的绿色小朋友的断断续续消失是有逻辑的解释，并且有一系列的步骤让我们的绿色朋友重新出现，而事实上，没有这样的步骤，我们只需要接受这是一个错误，以保存我们头皮上剩下的毛发。|2512124|entityMap^0|27|2|3Z|C|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@$9|L|A|M|B|C]|$9|N|A|O|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|P|8|@]|E|@]|F|$]]|$1|I|3|-4|5|6|7|Q|8|@]|E|@]|F|$]]]|J|$]]

There is an Intellij bug that will result to an intermittent disappearance of that little tiny green run button on the left side of the source code (on same column where the red circle breakpoints are). Yes, you can right-click on the mouse and can do the run via the menu, BUT we love that tiny green button so bring it back!! From time to time, i see this green friend and then suddenly it vanish mysteriously and comes back again. I did all, such as <code>rm -rf .idea</code> and other weird stuff, but no explanation has ever been achieved to explain the vanishing green button and it's sudden re-appearance intermittently.
I am drafting this answer, because all of the above answers seems to claim that there is a logical explanation of the intermittent disappearance of our little green friend and that a sequence of steps exists to make our little green friend re-appear, when in fact, there is no such steps and we just have to accept this is a bug to save the remaining hairs in our scalp.

blocks|key|2511966|text|在我的例子中，在从IDEA+2019.2升级到2019.3之后，所有项目的Run/Debug按钮都消失了。尝试检查源代码根，使缓存无效，运行/调试配置等等-没有成功。只有还原Run/Debug操作组才有帮助：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2511967|右键单击主工具栏(按钮消失的地方)>自定义菜单和工具栏.>选择Run/Debug+>还原Run/Debug。|2511968|​|2511969|📷|atomic|2511970|2511971|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/59d9956d6ab72d1296bc203ed3924d67.png|imageAlt^0|11|3|15|5|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|M|3|I|5|6|7|17|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

In my case Run/Debug buttons disappeared for all projects after updating from IDEA 2019.2 to 2019.3. Tried checking Sources Root, Invalidate Caches, Run/Debug configurations etc - no luck. Only restoring Run/Debug action group helped:

Right click on main toolbar (where the button disappeared) > Customize Menus and Toolbars... > select Run/Debug > Restore Run/Debug.

<a href="https://i.stack.imgur.com/85Bc0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/85Bc0.png" alt="enter image description here"></a>

blocks|key|1755097|text|我在intellij+2019.3和2020.1中遇到了同样的问题，并在这里找到了解决方案：https://youtrack.jetbrains.com/issue/IDEA-228180。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1755098|基本上，在IDE中，运行/调试按钮和代码中的错误检测都丢失了。|1755099|修复方法是禁用插件'+Gradle‘(反正我也不需要它)：设置>+Plugins+>Gradle，然后单击禁用并应用。在重新启动IDE之后，它应该可以工作|1755100|entityMap|0|LINK|mutability|MUTABLE|url|https://youtrack.jetbrains.com/issue/IDEA-228180^0|1A|1C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

I got the same problem with intellij 2019.3 and 2020.1 and found the solution here : <a href="https://youtrack.jetbrains.com/issue/IDEA-228180" rel="nofollow noreferrer">https://youtrack.jetbrains.com/issue/IDEA-228180</a>.
Basically, in the IDE the buttons run/debug and the error detection in the code were missing.
The fix was to disable the plugin 'Gradle' (I don't need it anyway) :
Settings &gt; Plugins &gt; Gradle and click disable and apply.
After restarting your IDE it should work

blocks|key|1755265|text|在使用SpringBoot构建微服务时，我遇到了这个问题。我在根文件夹中添加了一个新的微服务，但我无法运行它，我正在使用Maven。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1755266|步骤：|1755267|开放pom.xml|unordered-list-item|1755268|右键单击并选择"Add项目“，它将立即解决它，但如果IDE不立即更新，则可以重新加载IDE。|1755269|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|N|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|O|8|@]|9|@]|A|$]]]|J|$]]

I had this issue when building a microservice with SpringBoot.
I added a new microservice into the root folder and I could not run it.I am using Maven.
Step:
<ul>
<li>Open pom.xml</li>
<li>right click and select &quot;Add as maven project&quot;
It should resolve it immediately but you can reload the IDE if it does not update immediately.</li>
</ul>

blocks|key|1755298|text|IDE：Idea+2021.2.3|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1755299|构建工具：Gradle|1755300|我删除了.idea并从Gradle源代码中重新导入了该项目。之后工作得很好。|CODE|1755301|entityMap^0|4|D|0|5|6|0|4|5|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|S|8|@$9|T|A|U|B|J]]|D|@]|E|$]]|$1|K|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|L|$]]

IDE: Idea 2021.2.3
Build tool: Gradle
I removed the <code>.idea</code> and reimported the project from the Gradle source. Worked fine after.

blocks|key|2617095|text|另一个原因可能是将突出显示级别设置为None，应该至少将其设置为语法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2617096|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|$]]

Another reason could be the Highlighting Level set to None, it should be set at least to Syntax.

blocks|key|1755223|text|首先，将文件夹作为源根。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1755224|其次，确保正确设置了项目的sdk。例如，如果您正确地设置了sdk，那么可以通过IDEA对import+java.util.Scanner进行分析。|offset|length|style|CODE|1755225|提示：|1755226|不要将SDK设置为IDEA的捆绑JDK。我将项目的SDK设置为JDK+11，最初由IDEA捆绑，然后发现它无法解决import+java.util.Scanner。设置为JDK+16+(由操作系统的包管理器安装)解决了这个问题，然后出现了“run”按钮。|ordered-list-item|1755227|如果IDEA可以索引一个java文件，那么文件图标将显示一个小的“c”，表示一个java类。如果不是，文件图标将显示一个小的“j”，正如这个问题的图像所显示的，表明一个java文件的IDEA没有索引。|1755228|entityMap^0|0|18|O|0|0|1L|O|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|M|3|N|5|L|7|Y|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|P|$]]

First, make the folder as source root.
Second, make sure you set the project’s sdk correctly. For example, if you set the sdk correctly then <code>import java.util.Scanner</code> can be analyzed by IDEA.
Tip:
<ol>
<li>try not setting the SDK to IDEA’s bundled JDK. I set the project’s SDK to JDK 11 bundled by IDEA at first then found it couldn’t resolve <code>import java.util.Scanner</code>. Setting to JDK 16 which is installed by the OS’s package manager solved this problem, then the “run” button showed up.
</li>
<li>If IDEA can index a java file then the file icon will show with a small “c”, indicating a java class. If not, the file icon will show with a small “j”, as this problem’s image shows, indicating a java file which IDEA doesn’t index.
</li>
</ol>

blocks|key|1755189|text|重新安装IDE，它解决了我的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1755190|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|$]]

Reinstall the IDE, it solved my problem.

blocks|key|2617121|text|我也应用了所有这些方法，但是它仍然不起作用，所以我停止了我的窗口防火墙并允许访问这个应用程序。我不知道它是如何为我工作的，但它只是显示在我的屏幕上，窗口防御防火墙已经停止了这个应用的一些功能，并有一个选项，所以我点击它，它现在工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2617122|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 also applied all these methods but it still didn't work so I stopped my window firewall and allowed access for this application. I don't know how it worked out for me but it just got displayed on top of my screen that window defender firewall has stopped some of this app's features and there was an option to allow so I clicked on it and it now works just fine.

Intellij doesn't show run button even if that file is in src folder.

<a href="https://i.stack.imgur.com/9O0lP.png"><img src="https://i.stack.imgur.com/9O0lP.png" alt="no run button"></a>

Maybe do you know what to do?

P. s. It's strange because that file used to show run button but after recloning git repository it just doesn't show any more.

Intellij doesn't show run button

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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Intellij不显示run按钮，即使该文件位于src文件夹中。​​也许你知道该怎么做吗？这很奇怪，因为那个文件过去常常显示run按钮，但是在重新克隆git存储库之后，它就不再显示了。

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