IntelliJ：找不到java.util.Optional [英] IntelliJ: cannot find java.util.Optional

问题描述

在IntelliJ的一个新项目中，我已经设置了Java 8 JRE / JDK和语言级别8.0。

In a new project in IntelliJ I have set up a Java 8 JRE/JDK and language level 8.0.

但由于某种原因，IDE无法找到 java.util.Optional 。该项目编译和工作正常（从IDE内部），但代码完成不起作用。

But for some reason, the IDE cannot find java.util.Optional. The project compiles and works just fine (from within the IDE, too) but code completion does not work.

任何想法？我想在他们的bugtracker上创建一张票之前询问其他一些用户...

Any ideas? I'd like to ask a few other users before creating a ticket on their bugtracker...

推荐答案

我终于弄明白了。无论出于何种原因，在编辑器，常规和自动导入下的exlus中都有一个java.util.Optional条目。

I finally figured this out. For whatever reason, there was an entry for java.util.Optional in the exlusions under Editor, General, and Auto Import.

删除它就可以了。不知道它是如何或为何最终存在的。听起来不像我想做的任何事情。

Removing that did the trick. No idea how or why it ended up being there. Doesn't sound like anything I would want to do.

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