blocks|key|4627945|text|对于追随者，有一件事对我很有帮助(自动补全只显示了cast字段instanceof等)我打开了一个没有正确链接到它的子模块的maven模块(它有一个注释掉的子模块部分)，所以IntelliJ只是在项目窗格中将maven+java文件显示为基本的“文本”文件，在其图标中带有一个很小的"j“。修复根maven+pom.xml文件，将子目录作为模块包含在内，瞧，它们又被当作真正的java文件对待了，哇！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4627946|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|$]]

For followers, one thing that helped me (auto complete only showed cast
field
instanceof
etc.) was that I had opened a maven module that didn't link correctly to its children (it had a commented out submodules section), so IntelliJ just showed the maven java files as basically "text" files with a tiny "j" in their icon in the project pane. Fixing up the root maven pom.xml file to include the children dirs as modules and voila, they are treated as real java files again, woot!

blocks|key|122054|text|确保在文件->项目结构->模块中标记所有源目录。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122055|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|$]]

Make sure you mark all your Source directories as such in File -> Project Structure -> Modules.

blocks|key|4627905|text|确保在运行IntelliJ时未处于省电模式(选中或未选中文件菜单->省电模式)。如果启用了省电模式，IntelliJ将不会运行background+tasks,+including+code+completion。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4627906|entityMap|0|LINK|mutability|MUTABLE|url|http://www.jetbrains.com/idea/webhelp/status-bar.html^0|1R|17|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]]]]

Ensure that you are not in Power Save Mode while running IntelliJ (File [menu] -> Power Save Mode checked or not). If Power Save Mode is enabled, IntelliJ will not run <a href="http://www.jetbrains.com/idea/webhelp/status-bar.html" rel="noreferrer">background tasks, including code completion</a>.

blocks|key|122253|text|我也遇到了同样的问题，这是因为我没有将文件夹标记为源代码根目录。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122254|右键单击src目录并将目录标记为>+Sources+Root。|122255|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 same problem and it was caused by me not having a folder marked as sources root.

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

blocks|key|122437|text|它帮助我将src目录标记为"Source+Root“。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122438|📷|atomic|offset|length|122439|​|122440|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/82d2132061790ba350b3c7810b52ccd9.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

It helped me to mark the src directory as the "Source Root".
<a href="https://i.stack.imgur.com/YC7V8.png" rel="noreferrer"><img src="https://i.stack.imgur.com/YC7V8.png" alt="enter image description here"></a>

blocks|key|4628103|text|剪切根文件夹中的文件夹.idea和文件*.iml，并将其粘贴到项目外的其他位置。当您重新打开项目时，自动导入将再次神奇地工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4628104|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|$]]

Cut the folder .idea and the files *.iml in the root folder and paste somewhere else out of project. when you re-open the project , auto import will work again magically.

blocks|key|4628018|text|右键单击项目->添加框架支持->选择Maven+->单击确定|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4628019|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 on project -> Add framework support -> Select Maven -> Click OK

blocks|key|122140|text|对我来说唯一有效的事情就是杀死IntelliJ+(在Ubuntu上)，然后重新启动它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122141|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|$]]

The only thing that worked for me was killing IntelliJ (on Ubuntu) and starting it again.

blocks|key|122238|text|这不是IntelliJ+13，而是更新的2017.1.1社区版本。在这里添加这个答案，这样其他人就可以从根源于Gradle配置的事业中受益。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122239|现在，在我的例子中，自动完成、生成覆盖方法和其他功能也不起作用。我弄清楚的是，在我的项目设置中，我对gradle模块有多个配置。当我清理了其余的模块并保留了项目所需的唯一一个模块(除了测试)时，所有的行为都恢复了正常。|122240|此外，在Gradle项目的这种情况下，请记住标记所有的sourceSet根文件夹和源文件夹。|122241|编辑:如果您不想为每个sourceSet创建多个配置，并且您正在导入gradle模块，那么在导入屏幕上，您还应该禁用为每个sourceSet创建模块标志。如果没有这个，我就必须在导入模块后删除多个模块。|122242|📷|atomic|offset|length|122243|​|122244|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/dc64fd8584204512c642cca44a34254e.png|imageAlt^0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@$K|12|L|13|1|14]]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]]]

This is not IntelliJ 13 but a more recent 2017.1.1 Community version. Adding this answer here so that others benefit from a cause that has its roots in the Gradle Configurations.

Now, in my case too the auto complete, Generate Override methods and other features were not working. What I figured out is that in my project settings, I had multiple configurations for the gradle modules. The moment I cleaned up the rest of the modules and retained the only one (apart from test) I needed for that project, all behaviors were back to normal.

Also in such cases of Gradle projects, remember to mark all your sourceSet root folders ad the Source folders.

Edit: If you do not want to create multiple configurations per sourceSet and you are importing a gradle module, on the import screen, you should also disable the Create a module for per sourceSet flag. Without this, I was having to remove the multiple modules after importing the module.<a href="https://i.stack.imgur.com/LSGKq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LSGKq.png" alt="Create module per sourceSet"></a>

blocks|key|122385|text|对于我来说，这是在一个没有添加到父项目pom中的模块中发生的(他们是故意这样做的)，这就是原因，我右键单击有问题的模块的pom.xml，然后单击|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|122386|​|122387|📷|atomic|122388|122389|现在，自动完成功能来了，除此之外，我还可以在右上角的maven选项卡中看到该模块作为一个单独的项目。|122390|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/1c6d288ca2f8f72d85a9b0852436ae67.png|imageAlt^0|1O|7|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|K|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|15|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

It was happening for me in a module that was not added in the parent project pom (they did it on purpose), that was the reason, I right clicked the <code>pom.xml</code> of the module that has the issue and clicked the

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

now the autocomplete came and in addition to that I can see the module as a separate project in the maven tab on the top right.

blocks|key|122167|text|我在编写eclipse-che客户端扩展代码时遇到了这个问题。Eclipse+che模块都是maven类型的。我的客户端扩展项目是一个独立的模块，可以独立于父项目进行编译。当我将相同的结构导入Intellij时，我的客户端扩展项目没有给出任何建议。在我将客户端扩展项目包含到父模块中(将其添加到pom.xml中)之后，建议就开始出现了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|122168|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 was facing this issue while coding for eclipse-che client extension. Eclipse che modules are all of maven type. My client extension project was an independent module which can be compiled independent of the parent project. When I imported the same structure to Intellij my client-side extension project was not giving suggestions. After I include the client-extension project to the parent module (adding it to pom.xml) the suggestions started showing up.

blocks|key|4628265|text|我也遇到过类似的问题，这个话题没有任何帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4628266|所以最后我让它工作了，我清除了缓存中的IntelliJ并重启。|4628267|文件>无效缓存/重新启动..>+Invalidate+Cache+and+Restart+(按钮)|offset|length|style|CODE|4628268|​|4628269|📷|atomic|4628270|4628271|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/3f4a6d1a2e55da2eccd8cef9f6d3af5b.png|imageAlt^0|0|0|G|S|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@$F|11|G|12|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|14|8|@]|9|@$F|15|G|16|1|17]]|A|$]]|$1|O|3|K|5|6|7|18|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]]]

I had similar problem, nothing in this topic helped.

So finally I made it work, I clear cache of IntelliJ and restart.

File > Invalidate Caches / Restart.. > <code>Invalidate Cache and Restart</code> (button)

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

<code>IntelliJ IDEA</code> 13 has started exhibiting a very weird behavior in my local setup.

Namely, in any new <code>Java</code> class added to an existing project, <code>Code Completion</code> does not work. So, after declaring an object variable of any type in the new class and then typing the name of that variable, followed by the dot (.), no suggestions come up for any of the methods of the corresponding object.

For example, after declaring

<pre><code>File f = new File("/home");
</code></pre>

typing <code>f.</code> does not bring up a list of all the methods in the <code>File</code> class, to select one from. As a matter of fact, when typing the dot (.), no suggestions appear and at the bottom left (in the status bar) of the IDE window, the message "Identifier expected. Identifier expected." is displayed. Sometimes, a long list of totally irrelevant methods from irrelevant components or libraries are proposed.

Strangely, <code>Code Completion</code> works as expected if the above declaration happens in any of the existing classes.

This behavior persists after many combinations of machine restart, IDE restart, project re-importing, closing/reopening, or rebuilding.

Any ideas?

IntelliJ Code Completion not working for new Java classes

IntelliJ IDEA

Eclipse

Ubuntu

Java

在我的本地设置中，IntelliJ IDEA 13开始显示出非常奇怪的行为。也就是说，在添加到现有项目中的任何新Java类中，Code Completion都不起作用。因此，在新类中声明任何类型的对象变量，然后键入该变量的名称，后跟圆点(.)之后，对于相应对象的任何方法都不会出现任何建议。例如，在声明File f = new File("/home");键入f.并不会调出File类中可供选择的所有

问IntelliJ代码完成不适用于新的Java类
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