blocks|key|4637521|text|打开项目的Properties+>+Java+Build+Path。选择Source选项卡，然后使用Add+Folders添加源文件夹。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4637522|entityMap^0|5|S|10|6|1E|B|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|$]]

Open <code>Properties &gt; Java Build Path</code> for the project. Select the <code>Source</code> tab and use <code>Add Folders</code> to add source folders.

blocks|key|4637550|text|删除构建路径中的实际源文件夹定义，并添加一个新的源文件夹，命名为src/main/java|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4637551|entityMap^0|W|D|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|$]]

Remove the actual source folder definition in the build path and add a new source folder an name it <code>src/main/java</code>

blocks|key|4637606|text|正如您已经发现的，您不能将源文件夹放在另一个源文件夹中，因此在创建src/main/java之前，您必须告诉Eclipse不要将src视为源文件夹。为此，右键单击src文件夹并选择build+path+->+remove+from+build+path。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4637607|完成此操作后，src将出现在文件夹树中的正常位置，因此您可以在其下创建main和java文件夹，并将现有的src/com移动到src/main/java/com。最后，右键单击新创建的源文件夹，并选择build+path+->+use+as+source+folder。|4637608|entityMap^0|X|D|1S|3|29|3|0|7|3|Z|4|14|4|1H|7|1R|H|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|I|$]]

As you've discovered, you can't have a source folder inside another source folder, so before you can create <code>src/main/java</code> you have to tell Eclipse not to treat <code>src</code> as a source folder. To do this, right click on the <code>src</code> folder and select build path -> remove from build path.

Once you have done this <code>src</code> will appear in the folder tree in its normal place, so you can create the <code>main</code> and <code>java</code> folders under it, and move the existing <code>src/com</code> to <code>src/main/java/com</code>. Finally right-click the newly-created <code>java</code> folder and select build path -> use as source folder.

blocks|key|4637649|text|我已经通过以下步骤解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4637650|右键单击“Maven+Project+->+Build+path”和“Configure+Build+Path”In+Order+->+Export选项卡，您可以看到类似“2+build+Path+entries+In”的消息，现在选择“JRE+System+Library”和“Maven+Dependencies”复选框单击“OK|4637651|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 have solved this issue by below steps:

Right click the Maven Project -> Build Path -> Configure Build Path
In Order and Export tab, you can see the message like '2 build path entries are missing'
Now select 'JRE System Library' and 'Maven Dependencies' checkbox
Click OK

blocks|key|131453|text|选中“JRE系统库”和“Maven依赖项”复选框单击“确定”，即可解决此问题。这可以在项目的“生成路径选项”中找到|type|unstyled|depth|inlineStyleRanges|entityRanges|data|131454|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 problem will be solved by checking on 'JRE System Library' and 'Maven Dependencies' checkboxs Click OK. this is found in the project's 'build path option'

blocks|key|131520|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|131521|📷|atomic|offset|length|131522|131523|如果您没有找到包含的路径，只需添加它将解析的路径即可。|131524|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c7d6d39c195a50870f5cd5053355c17f.png|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@$E|U|F|V|1|W]]|A|$]]|$1|G|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

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

If you don't find the Included Path just add the path it will resolve.

blocks|key|131580|text|如果包结构设置为src.main.java.com.inventica，而不是com.inventica，这通常是因为在项目属性>+Java+build+path+>+Source下，源文件夹设置为src而不是src/main/java。没有简单的方法来解决这个问题，所以删除src作为源文件夹，然后单击ok。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|131581|现在Eclipse将显示一个文件夹层次结构src/main/java。浏览到java文件夹>右键单击>构建路径>用作源文件夹。|131582|在此之后，您可能必须修复Eclipse和.classpath文件，使其使用.project来管理依赖项、构建等。|131583|通常，您可以从一个正在工作的项目中复制它，因为这里没有任何特定于项目的东西，假设您被构造为一个标准的Maven项目。|131584|entityMap^0|8|R|13|D|2R|3|2X|D|3U|3|0|L|D|12|4|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]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|13|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|14|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|M|$]]

If the package structure is setup as <code>src.main.java.com.inventica</code>, instead of <code>com.inventica</code>, that’s usually because under project properties > Java build path > Source, the source folder is setup as <code>src</code> instead of <code>src/main/java</code>. There’s no easy way to fix this, so remove <code>src</code> as a source folder and click ok. 

Now Eclipse will show a folder hierarchy <code>src/main/java</code>. Browse to the <code>java</code> folder > right-click > build path > use as source folder. 

After this, you may have to fix the Eclipse .project and .classpath files to have it use Maven to manage dependencies, builds etc. 

Typically, you can copy this from a working project since there isn’t anything project specific here assuming you’re structured as a standard Maven project.

blocks|key|131652|text|简单解决方案是直接在驱动器中创建'java‘文件夹，甚至在eclipse中打开它之前就将其放入src/main，这样eclipse就不会抱怨这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|131653|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|$]]

Simple solution would be create 'java' folder directly one the drive into src/main even before opening it in eclipse that way eclipse will not complain about the issue.

blocks|key|131770|text|解决方案一：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|131771|将JRE版本更改为1.8，并将其更改回原始版本(对于maven-archetype-webapp，原始版本为1.7)。|131772|​|131773|📷|atomic|offset|length|131774|131775|解决方案二：|131776|选中"Order+and+Export“中的JRE选项和Maven+Dependencies选项。|131777|131778|131779|131780|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/dbb46cb934442c55cfc77b5a9e7c1f07.jpeg|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/68bcd238b3383c763c0b62ffaec476d6.jpeg^0|0|0|0|0|1|0|0|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@$I|17|J|18|1|19]]|A|$]]|$1|K|3|E|5|6|7|1A|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1B|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1C|8|@]|9|@]|A|$]]|$1|P|3|E|5|6|7|1D|8|@]|9|@]|A|$]]|$1|Q|3|G|5|H|7|1E|8|@]|9|@$I|1F|J|1G|1|1H]]|A|$]]|$1|R|3|E|5|6|7|1I|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]|11|$5|V|W|X|A|$Y|12|10|-4]]]]

Solution One:
Change the JRE version to 1.8 and change it back to the original version (for maven-archetype-webapp, the original version is 1.7).
<a href="https://i.stack.imgur.com/udZ2x.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/udZ2x.jpg" alt="Steps Here" /></a>
Solution Two:
Check the JRE option and Maven Dependencies option in &quot;Order and Export&quot;.
<a href="https://i.stack.imgur.com/DyZHk.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DyZHk.jpg" alt="Steps Here" /></a>

How do I create the <code>src/main/java</code> and <code>src/test/java</code> in my default web application project in Eclipse without Maven? My current folder structure is 

<pre><code>TestApp
├── JavaResources
│ └── src 
│ └── com.mypackage
└── WebContent
</code></pre>

Creating a src/main/java folder structure in Eclipse without Maven

在没有Maven的情况下，如何在Eclipse的默认web应用程序项目中创建src/main/java和src/test/java？我当前的文件夹结构是TestApp├── JavaResources│   └── src  │       └── com.mypackage└── WebContent

问在没有Maven的Eclipse中创建src/main/java文件夹结构
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