eclipse Maven 突然想要 src/ 而不是 src/main/java

Maven suddenly wants src/ instead of src/main/java

提问by Aaron Digulla

I'm using Maven 3.3.3 together with Eclipse Mars and m2e. Yesterday, I created a new Java project and converted it into a Maven one.

我将 Maven 3.3.3 与 Eclipse Mars 和 m2e 一起使用。昨天，我创建了一个新的 Java 项目并将其转换为 Maven 项目。

Afterwards, the classpath contained only srcinstead of the standard src/main/java. I was surprised but I simply created the missing folders and ran m2e's "Update Project". This didn't solve the problem; m2e still insisted on using only src.

之后，类路径只包含src而不是标准的src/main/java. 我很惊讶，但我只是创建了丢失的文件夹并运行了 m2e 的“更新项目”。这并没有解决问题；m2e 仍然坚持只使用src.

So I edited the classpath manually to end up with with the usual

所以我手动编辑了类路径以得到通常的

src/test/java
src/test/resources
src/main/java
src/main/resources

When I try m2e's "Update Project" now, I get this error:

当我现在尝试 m2e 的“更新项目”时，出现此错误：

Cannot nest 'foo/src/test/java' inside 'foo/src'. To enable the nesting, exclude 'test/' from 'foo/src'

sighI went to the command line next and ran mvn eclipse:eclipseto get this classpath:

叹气我接下来去了命令行并运行mvn eclipse:eclipse以获取此类路径：

src/test/java
src/test/resources
src
src/main/resources

Now, I'm completely stumped. Why is that happening?

现在，我完全被难住了。为什么会这样？

回答by Aaron Digulla

Open your POM in the POM editor and click on the "Effective POM" tab. Search for sourceDirectory. You'll probably see something like this:

在 POM 编辑器中打开您的 POM，然后单击“Effective POM”选项卡。搜索sourceDirectory。你可能会看到这样的事情：

<sourceDirectory>src</sourceDirectory>

When you first converted the Java project to Maven, m2e tried to keep the classpath the same. Eclipse Java projects have a different layout by default. They use src/instead of src/main/java/. There is no test folder since Eclipse projects usually put their tests into a different project.

当您第一次将 Java 项目转换为 Maven 时，m2e 尝试保持类路径相同。默认情况下，Eclipse Java 项目具有不同的布局。他们使用src/代替src/main/java/. 没有测试文件夹，因为 Eclipse 项目通常将它们的测试放入不同的项目中。

To fix the issue:

要解决此问题：

1. Delete the sourceDirectoryelement from the POM (Note: It might be in a parent POM).
2. Go to the project
3. Select all the source folders
4. Remove them from the build path (context menu -> Build Path -> Remove From Build Path).
5. Update the project

1. sourceDirectory从 POM 中删除元素（注意：它可能在父 POM 中）。
2. 前往项目
3. 选择所有源文件夹
4. 从构建路径中删除它们（上下文菜单 -> 构建路径 -> 从构建路径中删除）。
5. 更新项目

The error should now be gone and the classpath should be correct.

错误现在应该消失了，类路径应该是正确的。

回答by Gene

There are two types of folders that you can create: 1) Package 2) Source Folder

您可以创建两种类型的文件夹：1) 包 2) 源文件夹

1) A package looks like this

1）一个包看起来像这样

To create a package, right click on the folder you want (in my example, I right clicked on Java Resources) --> New --> Package

要创建包，请右键单击所需的文件夹（在我的示例中，我右键单击 Java 资源）--> 新建 --> 包

A pop up window that looks like this should appear

应该出现一个看起来像这样的弹出窗口

“Source folder:” That is where you choose your project. If you don't see anything there, click on “Browse…” and find your project. If I click “Browse…” it shows this:

“源文件夹：”这是您选择项目的地方。如果您在那里没有看到任何内容，请单击“浏览...”并找到您的项目。如果我单击“浏览...”，它会显示：

“Name:” is the name you will give your package.

“名称：”是您为包裹取的名称。

Note: Packages should be within Source Folders. Source Folders are the parent folder.

注意：包应该在源文件夹中。源文件夹是父文件夹。

2) Source Folders look like this:

2) 源文件夹如下所示：

To create a Source Folder, right click on the folder you want (in my example, I right clicked on Java Resources) --> New --> Source Folder

要创建源文件夹，请右键单击所需的文件夹（在我的示例中，我右键单击 Java 资源）--> 新建 --> 源文件夹

Under “Project name:” write your project's name. If you need help, click “Browse…”

在“项目名称：”下写下您的项目名称。如果您需要帮助，请单击“浏览...”

Under “Folder name:” write the folder name you want.

在“文件夹名称：”下写下您想要的文件夹名称。

Error: If you're trying to create a “src/main/resources” folder and you're running into this error “Cannot nest ‘ProjectName' inside ‘ProjectName'. To enable the nesting exclude ‘main/' from

错误：如果您尝试创建“src/main/resources”文件夹并且遇到此错误“无法在“ProjectName”中嵌套“ProjectName”。启用嵌套排除 'main/' from

Solution:

解决方案：