blocks|key|2903016|text|您可以通过以下方式将src文件夹添加到构建路径：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2903017|2903018|选择Java+perspective.|ordered-list-item|2903019|Right，单击src文件夹。|2903020|选择构建路径>使用源文件夹。|2903021|2903022|你就完了。希望这能有所帮助。|2903023|编辑：引用Eclipse+documentation|BOLD|2903024|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eclipse.org/documentation/^0|A|3|0|0|0|8|3|0|0|0|0|0|3|5|L|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|14|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|15|8|@]|D|@]|E|$]]|$1|J|3|K|5|I|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|L|3|M|5|I|7|19|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1B|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1C|8|@$9|1D|A|1E|B|S]]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|T|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|10]]]]

You can add the <code>src</code> folder to build path by:

<ol>
<li>Select Java perspective.</li>
<li>Right click on <code>src</code> folder.</li>
<li>Select Build Path > Use a source folder.</li>
</ol>

And you are done. Hope this help.

EDIT: Refer to the <a href="http://www.eclipse.org/documentation/">Eclipse documentation</a>

blocks|key|238136|text|我正在尝试使用Eclipse及其Maven插件来设置一个动态web项目。我选择了maven-archetype-webapp，也面临着同样的问题(当我试图为某些属性自动生成getter和setter时，我遇到了这个问题)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|238137|我的解决方法是右键单击项目，选择Build+Path+-->+Configure+Build+Path，然后删除我在/src/main/resources条目下找到的一个奇怪的排除过滤器"Excluded:**“。|238138|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 am trying to set up a dynamic web project using Eclipse and its Maven plugin.
I am selecting maven-archetype-webapp and am facing the same problem (which I run into when trying to automatically produce getters and setters for some attributes).
My way around this was to right-click on the project, select Build Path --&gt; Configure Build Path and then remove a weird exclusion filter &quot;Excluded:**&quot; which I found under the entry /src/main/resources.

blocks|key|2903131|text|最近我遇到了一个类似的问题。导入没有.project文件的项目时，会生成一个没有生成器的默认空.project文件。下面是一个使其工作的示例.project。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2903132|<buildSpec>
++++<buildCommand>
++++++++++++<name>org.eclipse.jdt.core.javabuilder</name>
++++++++<arguments>
++++++++</arguments>
++++</buildCommand>
</buildSpec>
<natures>
++++<nature>org.eclipse.jdt.core.javanature</nature>
</natures>|code-block|syntax|javascript|2903133|entityMap^0|I|8|1B|8|1Y|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

Recently I met a similar problem. When importing a project without a <code>.project</code> file, a default empty <code>.project</code> file was generated without builders. Here is an example <code>.project</code> to make it work.
<pre><code>&lt;buildSpec&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;org.eclipse.jdt.core.javabuilder&lt;/name&gt;
 &lt;arguments&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
&lt;/buildSpec&gt;
&lt;natures&gt;
 &lt;nature&gt;org.eclipse.jdt.core.javanature&lt;/nature&gt;
&lt;/natures&gt;
</code></pre>

blocks|key|2903165|text|你所要做的就是将你的项目文件夹移到Src下，就这样，一切都完成了。如果还有什么问题，请告诉我。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2903166|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|$]]

All you got to do is move your Project folder under the Src, that is all, it is done. Let me know if any more questions.

blocks|key|3117248|text|这意味着您的项目不在Eclipse的编译路径上。如果在接受答案后问题仍然存在，那么您需要首先将该项目放在编译路径上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3117249|为此，您需要将项目再次导入到您的工作区中。|3117250|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|$]]

It means your project isn't on the compilation path of Eclipse. If after the accepted answer the problem still persists, then you need to first place that project on the compilation path.
For that, you need to import the project again into your workspace.

blocks|key|237122|text|我发现了一个类似的问题，并通过更正.project文件修复了它。对于Java项目，.project文件的natures标记中必须包含以下标记|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|237123|org.eclipse.jdt.core.javanature|237124|237125|完整的.project文件示例|237126|<?xml+version="1.0"+encoding="UTF-8"?>
<projectDescription>
++++<name>SampleProjectName</name>
++++<comment></comment>
++++<projects>
++++</projects>
++++<buildSpec>
++++++++<buildCommand>
++++++++++++<name>org.maven.ide.eclipse.maven2Builder</name>
++++++++++++<arguments>
++++++++++++</arguments>
++++++++</buildCommand>
++++++++<buildCommand>
++++++++++++<name>oracle.eclipse.tools.weblogic.sharedLibraryFrameworkValidator</name>
++++++++++++<arguments>
++++++++++++</arguments>
++++++++</buildCommand>
++++</buildSpec>
++++<natures>
++++++++<nature>org.eclipse.jdt.core.javanature</nature>
++++</natures>
</projectDescription>|code-block|syntax|javascript|237127|entityMap^0|H|8|15|8|1G|7|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]|$1|I|3|J|5|6|7|10|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|11|8|@]|D|@]|E|$N|O]]|$1|P|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|Q|$]]

I found a similar issue and fixed it by correcting the <code>.project</code> file. For a Java project the <code>.project</code> file must have the below tag within the <code>natures</code> tag
org.eclipse.jdt.core.javanature
<hr />
Example of complete .project file
<pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;projectDescription&gt;
 &lt;name&gt;SampleProjectName&lt;/name&gt;
 &lt;comment&gt;&lt;/comment&gt;
 &lt;projects&gt;
 &lt;/projects&gt;
 &lt;buildSpec&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;org.maven.ide.eclipse.maven2Builder&lt;/name&gt;
 &lt;arguments&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;oracle.eclipse.tools.weblogic.sharedLibraryFrameworkValidator&lt;/name&gt;
 &lt;arguments&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
 &lt;/buildSpec&gt;
 &lt;natures&gt;
 &lt;nature&gt;org.eclipse.jdt.core.javanature&lt;/nature&gt;
 &lt;/natures&gt;
&lt;/projectDescription&gt;
</code></pre>

blocks|key|238233|text|看起来您在src/main/resources下创建了Java类，而不是在src/main/java下创建|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|238234|entityMap^0|5|I|11|D|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Looks like you created your Java class under src/main/resources instead of src/main/java

blocks|key|3117329|text|将文件夹src/main/resource的名称重构为src/main/java。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3117330|右键单击项目>构建路径>使用源代码文件夹。|3117331|entityMap^0|4|H|R|D|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

Refactor the name of the folder <code>src/main/resource</code> to <code>src/main/java</code>.

Right click the project > Build Path > Use Source Folder.

blocks|key|3117346|text|在我的例子中，我有一个包含许多子文件夹的java项目，每个子文件夹都包含自己的src文件夹。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3117347|project
-subfolder
--src/main/java
-subfolder2
--src/main/java|code-block|syntax|javascript|3117348|当我使用Build+Path+->右键单击选项时，没有可用的选项，正如其他响应所概述的那样。|3117349|我必须转到Properties+->+->+Facets并单击convert+to+faceted+project。|3117350|然后，我将所有的src文件夹添加到构建路径中。|3117351|entityMap^0|13|3|0|0|0|V|Q|0|8|3|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

In my case, I had a java project containing many subfolders, each containing its own <code>src</code> folder. 

<pre><code>project
-subfolder
--src/main/java
-subfolder2
--src/main/java
</code></pre>

There was no options available when I used the Build Path -> right click option, as outlined by other responses.

I had to go to Project -> Properties -> Project Facets and click <code>convert to faceted project</code>.

Then I got all the <code>src</code> folders added to the build path.

blocks|key|240081|text|如果在导入之后使用pom.xml从外部源导入了项目，请转到项目->属性->Maven并启用Java这将解决错误|type|unstyled|depth|inlineStyleRanges|entityRanges|data|240082|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|$]]

If you imported a project from external source with pom.xml after import, go to Project->Properties->Maven and enable Java EE - This will resolve the error

blocks|key|3117475|text|将Eclipse+Oxygen与multimodule+maven+project+make+sure+you're+not+editing+the+file+in+the+maven+parent+project结合使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3117476|这会导致"Open声明“、”Open+Type+Hierarchy“和”Open+Call+Hierarchy“显示出令人生畏的对话框，甚至会扰乱自动补全。|3117477|确保您不是在编辑父项目，而是编辑子项目以避免错误。|3117478|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/2206572/eclipse-this-compilation-unit-is-not-on-the-build-path-of-a-java-project/7415743?s=1%257C40.4885#7415743^0|G|2J|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]]]]

Using Eclipse Oxygen with a <a href="https://stackoverflow.com/questions/2206572/eclipse-this-compilation-unit-is-not-on-the-build-path-of-a-java-project/7415743?s=1%7C40.4885#7415743">multimodule maven project make sure you're not editing the file in the maven parent project</a>.
This caused the &quot;Open Declaration', 'Open Type Hierarchy' and 'Open Call Hierarchy' to show the dreaded dialog in question. It would even mess with the autocomplete.
Make sure you are not editing the parent project and instead edit the child project to avoid the error.

blocks|key|2903379|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2903380|从工作区删除项目(取消选中从磁盘物理删除项目)|ordered-list-item|2903381|转到项目位置并删除.project文件|2903382|再次导入项目。|2903383|2903384|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|K|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|L|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|M|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|N|7|@]|8|@]|9|$]]|$1|H|3|-4|4|5|6|O|7|@]|8|@]|9|$]]|$1|I|3|-4|4|5|6|P|7|@]|8|@]|9|$]]]|J|$]]

<ol>
<li>Delete project from workspace (Uncheck physical deletion of project from disk)</li>
<li>go to project location and delete .project file</li>
<li>Import the project again.</li>
</ol>

blocks|key|240111|text|在我的例子中，没有正确指定源文件夹。要解决问题，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|240112|240113|右键单击项目explorer|unordered-list-item|240114|Select+Properties|offset|length|style|CODE|240115|Select+Java+Build+Path|240116|Select+Source选项卡中的项目名称，并检查其中的内容。确保Add+Folder...并选择作为源文件根目录的文件夹。|240117|240118|因此，您将注意到，项目资源管理器中的文件夹结构将被修改为显示包图标和包名称。|240119|entityMap^0|0|0|0|7|A|0|7|F|0|7|6|Y|D|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|X|8|@$H|Y|I|Z|J|K]]|9|@]|A|$]]|$1|L|3|M|5|E|7|10|8|@$H|11|I|12|J|K]]|9|@]|A|$]]|$1|N|3|O|5|E|7|13|8|@$H|14|I|15|J|K]|$H|16|I|17|J|K]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$]]

In my case the source folder wasn't specified correctly. To solve the problem :

<ul>
<li>Right click on project name in project explorer</li>
<li>Select <code>Properties</code></li>
<li>Select <code>Java Build Path</code></li>
<li>Select <code>Source</code> tab and inspect what is there. Make sure to <code>Add Folder...</code> and select the folder which is the root of your source files.</li>
</ul>

As a result, you will notice that your folder structure in the project explorer will be modified to display package icons and package names instead.

blocks|key|240126|text|如果您在一个尚未构建的新项目中打开一个文件，而不是在Java透视图中，然后返回到Java透视图，则会收到此警告消息。关闭该文件，然后在Java透视图中重新打开它，然后重试。如果失败了，已经提供的其他解决方案将会有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|240127|例如：|240128|Java导入项目是在一个git+repository|240129|Open的git+perspective|unordered-list-item|240130|
|240131|Open的Git+Staging视图|240132|240133|右击Java源文件，并选择打开工作树版本|240134|240135|打开Java+perspective.|240136|240137|Now的“正常”功能可能无法正常工作。请注意，文件路径是指向工作站的文字路径，而不是工作区。|240138|240139|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|H|7|13|8|@]|9|@]|A|$]]|$1|M|3|J|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|H|7|15|8|@]|9|@]|A|$]]|$1|P|3|J|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|17|8|@]|9|@]|A|$]]|$1|S|3|J|5|6|7|18|8|@]|9|@]|A|$]]|$1|T|3|U|5|H|7|19|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|X|$]]

If you open a file while in a perspective other than Java on a new project that hasn't yet been built and then go back to the Java perspective, you can get this alert message.
Close the file and open it back up while in the Java perspective and then retry.
Then if that fails the other solutions already provided will be of help.
For example:
<ul>
<li>Import a project that is in a git repository</li>
<li>Open the git perspective</li>
<li>Open the Git Staging view</li>
<li>Right click on a Java source file and select Open Working Tree Version</li>
<li>Open the Java perspective.</li>
<li>Now the &quot;normal&quot; Java features may not work correctly. Note that the file path is a literal path to the work station not the workspace.</li>
</ul>

blocks|key|3117581|text|似乎你从git而不是从本地存储库导入了项目到你的工作区。要将本地存储库项目添加到工作区，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3117582|单击project+(demoApp)+->+imports+projects+->+finish。|3117583|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|$]]

Seems you imported the project to your workspace from git and not from a local repository. To add a local repository project to the workspace do the following:
Click on project (demoApp) -&gt; imports projects -&gt; finish.

blocks|key|240149|text|右键单击项目->属性->项目方面->+Convert+->在复选框中选择->+Apply+->+Close|type|unstyled|depth|inlineStyleRanges|entityRanges|data|240150|现在你应该能够看到你的层次结构了。|240151|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|$]]

Right click on your project -&gt; Properties -&gt; Project facets -&gt; Convert -&gt; Select Java in the checkboxes -&gt; Apply and Close
Now you should be able to see your hierarchy.

I have been given a source folder (<code>src</code>) of a Java Project. I have created a <code>.project</code> file, kept it inside that folder and imported that project into Eclipse 3.6 through the Import Existing Projects into Workspace Option and added the required jars to it.
Now the problem is that when ever I do a Call Hierarchy on a Project, it displays an alert box saying
&quot;The resource is not on the build path of a java project&quot;
Could somebody please let me know how to resolve this?
Please see the image here:
<a href="https://i.stack.imgur.com/11vvL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/11vvL.png" alt="enter image description here" /></a>
Thanks

Eclipse: The resource is not on the build path of a Java project

Eclipse

Java

我得到了一个Java项目的源文件夹(src)。我已经创建了一个.project文件，将其保存在该文件夹中，并通过Import Existing Projects into Workspace选项将该项目导入到Eclipse3.6中，并向其中添加了所需的jars。现在的问题是，每当我在项目上执行调用层次结构时，它都会显示...

问Eclipse:资源不在Java项目的生成路径上
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问Eclipse:资源不在Java项目的生成路径上
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