blocks|key|268217|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|268218|我已经运行了mvn+eclipse:eclipse|blockquote|268219|268220|我在PackageExplorer+>+Maven+>+Update+project+Configuration中右键单击了该项目|268221|268222|这两个应该是相互排斥的。您可以使用eclipse:eclipse从外部管理项目，也可以使用m2eclipse从内部管理项目。不要把它们混为一谈。|offset|length|style|CODE|268223|问题的可能原因：|268224|打包为POM+(可能这是多模块项目的根，在这种情况下，您必须导入模块项目)。m2eclipse不会将Java性质添加到POM项目中(+eclipse:eclipse，btw)|268225|entityMap^0|0|0|0|0|0|H|F|19|9|0|0|0^^$0|@$1|2|3|-4|4|5|6|T|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|U|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|V|7|@]|8|@]|9|$]]|$1|E|3|F|4|5|6|W|7|@]|8|@]|9|$]]|$1|G|3|-4|4|5|6|X|7|@]|8|@]|9|$]]|$1|H|3|I|4|5|6|Y|7|@$J|Z|K|10|L|M]|$J|11|K|12|L|M]]|8|@]|9|$]]|$1|N|3|O|4|5|6|13|7|@]|8|@]|9|$]]|$1|P|3|Q|4|5|6|14|7|@]|8|@]|9|$]]|$1|R|3|-4|4|5|6|15|7|@]|8|@]|9|$]]]|S|$]]

<blockquote>
 I've run mvn eclipse:eclipse 
 I've right-clicked the project in the
 PackageExplorer > Maven > Update
 Project Configuration
</blockquote>

Those two should be mutually exclusive. Either you manage a project from the outside using <code>eclipse:eclipse</code> or from the inside using <code>m2eclipse</code>. Don't mix them.

Possible cause of the problem:

The packaging is POM (perhaps this is the root of a multi-module project, in which case you have to import the module projects). m2eclipse doesn't add the Java nature to POM projects (nor does eclipse:eclipse, btw)

blocks|key|264558|text|通过从我的工作区删除项目，删除所有.project、.classpath文件和.settings文件夹，然后重新导入，问题就解决了。我不知道为什么它第一次不能工作。谢谢大家的帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264559|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|$]]

Problem was solved simply by deleting the project from my workspace, deleting all .project, .classpath files and .settings folders, and re-importing. I don't know why it didn't work the first time. Thanks for the help, everyone.

blocks|key|264561|text|如果您在Eclipse中安装了M2插件，请确保您的系统中安装了Maven2.7以上版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264562|之后，运行mvn+eclipse:clean，然后运行mvn+eclipse:eclipse。|offset|length|style|CODE|264563|将在您的项目文件夹中创建.classpath和.project。一切都会好起来的。|264564|entityMap^0|0|5|H|R|J|0|C|A|N|8|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|K|$]]

Make sure if you have M2 plugin in Eclipse, you have Maven 2.7 above installed in your system.

After that run 
<code>mvn eclipse:clean</code> then
<code>mvn eclipse:eclipse</code>. 

<code>.classpath</code> and <code>.project</code> will be created in your project folders.
Everything should be fine.

blocks|key|2962825|text|请关注下面的网站。右键单击项目，转到Properties，然后选择project+Facets。这会将其转换为java/动态web项目以供使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2962826|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|$]]

pls follow the below website.. 
Right click on the project, go to Properties, then select Project Facets. this will convert it to a java/dynamic web projects for the use.

blocks|key|266841|text|我也有同样的问题。在我的例子中，我签出了一个包含多个(父/子)pom的Maven项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|266842|如果您的存储库/分支中的最高级别Maven项目只是管理子pom，那么它可能根本不包含Java定义。您需要在Eclipse中将这些子项目作为一个独立的项目打开。|266843|您可以通过右键单击您的项目->+->+Existing+Maven+Projects+->，然后选择您想要更改的子项目来完成此操作。|266844|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I had what seemed like the same issue. In my case, I was checking out a Maven project that contained multiple (parent/child) poms. 

If the highest level Maven project within your repository/branch simply manages child poms, it may not contain Java definitions at all. You will need to open these child projects as an independent project within Eclipse. 

You can do this by right clicking on your project -> Import -> Maven -> Existing Maven Projects -> then select child project you are wanting to change.

blocks|key|3176554|text|我使用的是版本:+Indigo+Service+Release+2+Build+:20120216-1857.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3176555|我还发现，在我安装了Maven插件之后，“项目浏览器”--右击“我的项目”没有列出"Maven“或"configure”选项。|3176556|读完上面的内容后，我试着在"Package+Explorer“上做同样的事情，令我惊讶的是它起作用了。现在'Project+Explorer‘也可以工作了！|3176557|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I'm using
Version: Indigo Service Release 2
Build id: 20120216-1857

I also found that after I installed the Maven plugin that 'Project Explorer' - Right click on 'my project' did not list option "Maven" or "configure".

On reading the above, I tried doing the same on "Package Explorer" and to my surprise it worked. And now 'Project Explorer' works too!

blocks|key|268283|text|我陷入了类似的情况，但我意识到，由于我正在尝试更改父集合，您无法找到eclipse+intellisense，因为它只是保存项目。尝试使用maven创建的独占项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|268284|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 got stuck in similar situation but I realized that since I am trying to change in the parent collection you cannot find eclipse intellisense due to the fact that it is just holding the projects. Try working on exclusive project created by maven.

blocks|key|266870|text|根据您使用的m2e版本，从Eclipse+Marketplace安装Eclipseandsubclipse.然后：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|266871|svn+|266872|打开Eclipse转到你的SVN+url+to+SVN仓库/代码库。|unordered-list-item|266873|
|266874|选择一个项目。右键单击并选择Checkout.|style|CODE|266875|266876|Assuming您的项目具有一个pom.xml，切换回您的Java透视图，选择刚刚导入的项目，右键单击并选择Configure+>+Convert+to+Maven+Project.|266877|266878|它现在应该被识别为Maven和Java项目(Maven和Java+natures将被添加到Eclipse+.project文件中)|266879|entityMap|0|LINK|mutability|MUTABLE|url|http://marketplace.eclipse.org/^0|D|J|0|0|0|0|0|E|8|0|0|1I|10|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|17|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|18|8|@]|9|@]|C|$]]|$1|K|3|L|5|H|7|19|8|@$A|1A|B|1B|M|N]]|9|@]|C|$]]|$1|O|3|J|5|6|7|1C|8|@]|9|@]|C|$]]|$1|P|3|Q|5|H|7|1D|8|@$A|1E|B|1F|M|N]]|9|@]|C|$]]|$1|R|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]|$1|S|3|T|5|6|7|1H|8|@]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

Install m2e and subclipse from the <a href="http://marketplace.eclipse.org/" rel="nofollow">Eclipse Marketplace</a> depending on what version of Eclipse you have. Then:

<ol>
<li>Open Eclipse go to <code>Window &gt; Open Perspective &gt; Other... &gt; SVN Repository Exploring</code>.</li>
<li>Add your svn url to SVN repository/code base.</li>
<li>Select a project. Right Click and select <code>Checkout</code>.</li>
<li>Assuming your project has a pom.xml, switch back to your Java perspective, select the project that was just imported, right click and select <code>Configure &gt; Convert to Maven Project</code>.</li>
</ol>

It should now be recognized as both a Maven and a Java project (Maven and Java natures will have been added to the Eclipse .project file)

blocks|key|3176633|text|右键单击项目-->属性-->+maven+-->生命周期映射-->检查(跳过maven编译器插件)单击确定，此时将显示构建路径。nw进行必要的更改|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3176634|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 project --> properties --> maven --> lifecycle mapping --> check (skip maven compiler plugin) click ok now the build path appears . nw do the necessary changes

blocks|key|3176646|text|检查pom.xml文件中的打包标签。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3176647|当我将pom.xml更改为使用时，它起作用了：|3176648|<packaging>jar</packaging>|code-block|syntax|javascript|3176649|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Check the packaging tag in the pom.xml file.

It worked when I changed pom.xml to use:

<pre><code>&lt;packaging&gt;jar&lt;/packaging&gt;
</code></pre>

blocks|key|264632|text|确保POM没有任何错误，Eclipse基于初始构建(自动或手动)检测项目类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264633|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 that POM doesn't have any error, Eclipse detecting the project types based on the initial build (automatically or manual).

blocks|key|2962966|text|项目性质由Eclipse中的.project文件决定，该文件还指示Eclipse关于父源代码和测试文件夹。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2962967|按如下方式更新/修改.project文件，使用该文件我们保留了项目的Maven兼容性和Java性质。|2962968|Eclipse+Project文件夹下的.project.xml|2962969|<?xml+version="1.0"+encoding="UTF-8"?>
<projectDescription>
++++++++<name>java-cgdk-en</name>
++++++++<comment></comment>
++++++++<projects>
++++++++</projects>
++++++++<buildSpec>
++++++++++++++++<buildCommand>
++++++++++++++++++++++++<name>org.eclipse.jdt.core.javabuilder</name>
++++++++++++++++++++++++<arguments>
++++++++++++++++++++++++</arguments>
++++++++++++++++</buildCommand>
++++++++</buildSpec>++
++++++++<natures>
++++++++++++++++<nature>org.eclipse.jdt.core.javanature</nature>
++++++++</natures>
</projectDescription>|code-block|syntax|javascript|2962970|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The Project nature is decided by the .project file in Eclipse, which also dictates to Eclipse about the Parent Source Code, and Test Folders.

Update/Modify the .project file as follows, using which We retain the Maven Compatibility and Java Nature of the Project.

.project.xml under the Eclipse Project folder

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;projectDescription&gt;
 &lt;name&gt;java-cgdk-en&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.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;
&lt;/projectDescription&gt;
</code></pre>

I've imported an existing maven project into Eclipse. I tried to set up the configurations for a JUnit test, and my project wouldn't come up as a testable project. When I typed in the project name manually, I was given the message:

<blockquote>
 Specified project is not a java project
</blockquote>

I've also noticed that when typing code and trying to call a method e.g. "System.out" a message pops up when I type the period, saying:

<blockquote>
 This compilation unit is not on the build path of a java project
</blockquote>

Additionally, there are no actions available when I right click the project and navigate to Build Path.

Having looked this up on here and elsewhere, I've followed the following pieces of advice, without success:

I've verified the existence of .project and .classpath files

I've looked in the .project file and verified the inclusion of a javanature

I've run mvn eclipse:eclipse

I've right-clicked the project in the PackageExplorer > Maven > Update Project Configuration

Java is not listed as a project facet but I'm not sure I should mess with that because I've tried clicking that, and that caused the entire project to be filled with errors (I think related to build path, but I can't quite remember). Removing Java as a facet didn't get rid of the errors and I had to re-import the project from scratch.

Sorry if any of this is vague, and thanks for the help.

I'm using m2eclipse.

EDIT: Problem was solved simply by deleting the project from my workspace, deleting all .project, .classpath files and .settings folders, and re-importing. I don't know why it didn't work the first time.

Issues with maven project running in eclipse, not recognized as Java project

编译器

Eclipse

Java

我已经将现有的maven项目导入到Eclipse中。我尝试为JUnit测试设置配置，但我的项目不能作为可测试项目出现。当我手动输入项目名称时，系统会显示以下消息：指定的项目不是java项目我还注意到，当键入代码并尝试调用方法时，例如"System.out“当我键入句点时，弹出一条消息，说：此编译单元不在java项目的生...

问在eclipse中运行的maven项目的问题，无法识别为Java项目
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