blocks|key|3062074|text|你检查过你的Project+Properties+->+Project+Facets面板了吗？(来自that+post)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3062075|3062076|项目由多个功能单元(称为facet)组成。Java+facet版本需要始终与java编译器兼容级别相匹配。|blockquote|3062077|3062078|更改java级别的最好方法是使用Project+Facets属性面板，因为这将同时更新两个位置。|3062079|3062080|​|3062081|📷|atomic|3062082|3062083|3062084|+"Project->Preferences->Project+Facets“将其配置存储在".settings”目录下的"org.eclipse.wst.common.project.facet.core.xml“文件中。内容可能如下所示|3062085|3062086|3062087|<?xml+version="1.0"+encoding="UTF-8"?>
<faceted-project>
++<runtime+name="WebSphere+Application+Server+v6.1"/>
++<fixed+facet="jst.java"/>
++<fixed+facet="jst.web"/>
++<installed+facet="jst.java"+version="5.0"/>
++<installed+facet="jst.web"+version="2.4"/>
++<installed+facet="jsf.ibm"+version="7.0"/>
++<installed+facet="jsf.base"+version="7.0"/>
++<installed+facet="web.jstl"+version="1.1"/>
</faceted-project>|code-block|syntax|javascript|3062088|还要检查你的Java+compliance+level|3062089|3062090|3062091|3062092|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eclipsezone.com/eclipse/forums/t80428.html|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/25ffc00991b17b80fab94d2a8450ba7c.jpeg|imageAlt|2|https://stackoverflow.com/a/3050240/6309|3|https://ask.qcloudimg.com/http-save/yehe-900000/1b026e50cccc28a933d4d0043b289616.png^0|6|10|1E|9|0|0|0|0|0|0|0|0|0|1|1|0|0|0|2|10|1B|9|1Q|19|0|0|0|0|6|L|2|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|1Q|8|@$9|1R|A|1S|B|C]]|D|@$9|1T|A|1U|1|1V]]|E|$]]|$1|F|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|1X|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|20|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|21|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|22|8|@]|D|@$9|23|A|24|1|25]]|E|$]]|$1|S|3|O|5|6|7|26|8|@]|D|@]|E|$]]|$1|T|3|-4|5|6|7|27|8|@]|D|@]|E|$]]|$1|U|3|V|5|I|7|28|8|@$9|29|A|2A|B|C]|$9|2B|A|2C|B|C]|$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|W|3|-4|5|6|7|2F|8|@]|D|@]|E|$]]|$1|X|3|-4|5|6|7|2G|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|10|7|2H|8|@]|D|@]|E|$11|12]]|$1|13|3|14|5|6|7|2I|8|@]|D|@$9|2J|A|2K|1|2L]]|E|$]]|$1|15|3|O|5|6|7|2M|8|@]|D|@]|E|$]]|$1|16|3|Q|5|R|7|2N|8|@]|D|@$9|2O|A|2P|1|2Q]]|E|$]]|$1|17|3|O|5|6|7|2R|8|@]|D|@]|E|$]]|$1|18|3|-4|5|6|7|2S|8|@]|D|@]|E|$]]]|19|$1A|$5|1B|1C|1D|E|$1E|1F]]|1G|$5|1H|1C|1I|E|$1J|1K|1L|-4]]|1M|$5|1B|1C|1D|E|$1E|1N]]|1O|$5|1H|1C|1I|E|$1J|1P|1L|-4]]]]

Did you check your <code>Project Properties -&gt; Project Facets</code> panel? (From <a href="http://www.eclipsezone.com/eclipse/forums/t80428.html" rel="noreferrer">that post</a>)

<blockquote>
 A WTP project is composed of multiple units of functionality (known as 
 facets). 
 
 The Java facet version needs to always match the java compiler compliance 
 level. 
 The best way to change java level is to use the Project Facets 
 properties panel as that will update both places at the same time. 
</blockquote>

<img src="https://i.stack.imgur.com/mQsdL.jpg" alt="WTP">

<blockquote>
 The "<code>Project-&gt;Preferences-&gt;Project Facets</code>" stores its configuration in this file, "<code>org.eclipse.wst.common.project.facet.core.xml</code>", under the "<code>.settings</code>" directory. 
 
 The content might look like this
</blockquote>

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;faceted-project&gt;
 &lt;runtime name="WebSphere Application Server v6.1"/&gt;
 &lt;fixed facet="jst.java"/&gt;
 &lt;fixed facet="jst.web"/&gt;
 &lt;installed facet="jst.java" version="5.0"/&gt;
 &lt;installed facet="jst.web" version="2.4"/&gt;
 &lt;installed facet="jsf.ibm" version="7.0"/&gt;
 &lt;installed facet="jsf.base" version="7.0"/&gt;
 &lt;installed facet="web.jstl" version="1.1"/&gt;
&lt;/faceted-project&gt;
</code></pre>

Check also your <a href="https://stackoverflow.com/a/3050240/6309">Java compliance level</a>:

<img src="https://i.stack.imgur.com/FsoIj.png" alt="Java compliance level">

blocks|key|314431|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314432|您有两个选项来解决此问题：|blockquote|314433|314434|1-手动确保两个版本匹配。|314435|2-使用集成开发环境的帮助，如下所示：|314436|在“Problems”视图中的错误上单击鼠标右键|unordered-list-item|314437|从弹出式菜单中选择“Quick+Fix”菜单项|314438|在提供的对话框中选择正确的编译器级别，然后单击[+'Finish'.|314439|314440|摘自|314441|还提供了您可以访问Java编译器和facet版本的位置。|314442|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|W|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|X|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|Y|7|@]|8|@]|9|$]]|$1|E|3|F|4|5|6|Z|7|@]|8|@]|9|$]]|$1|G|3|H|4|5|6|10|7|@]|8|@]|9|$]]|$1|I|3|J|4|K|6|11|7|@]|8|@]|9|$]]|$1|L|3|M|4|K|6|12|7|@]|8|@]|9|$]]|$1|N|3|O|4|K|6|13|7|@]|8|@]|9|$]]|$1|P|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|Q|3|R|4|5|6|15|7|@]|8|@]|9|$]]|$1|S|3|T|4|5|6|16|7|@]|8|@]|9|$]]|$1|U|3|-4|4|5|6|17|7|@]|8|@]|9|$]]]|V|$]]

<blockquote>
 You have two options to fix the issue:
 
 1- Manually make sure the two versions match. 
 2- Use the IDE's help as follows: 
 - Right mouse click on the error in the 'Problems' view 
 - Select the 'Quick Fix' menu item from the pop-up menu 
 - Select the right compiler level in the provided dialog and click 'Finish'. 
</blockquote>

Taken from <a href="http://codewriterstips.blogspot.com/2009/03/eclipse-java-compiler-level-and-project.html" rel="noreferrer">Eclipse: Java compiler level and project facet mismatch</a>

Also gives location of where you can access the Java compiler and facet version.

blocks|key|314459|text|项目方面应该由M2Eclipse插件从POM配置中自动派生。如果您对POM进行了一些更改，并且需要Eclipse将其考虑在内，那么右键单击项目上的，然后转到Maven+>+Update+project+Configuration。您不应该手动设置项目方面。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|314460|entityMap^0|26|10|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|$]]

The project facets should be derived automagically by the M2Eclipse plugin from the POM configuration. If you make some changes to the POM and need Eclipse to take them into account, right-click on your project, then go to Maven > Update Project Configuration. You should not set project facets manually.

blocks|key|3275300|text|在Spring+STS中，右键单击项目并选择"Open+Project"，此配置在后台执行必要的操作并将项目带回工作区。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3275301|谢谢并向Vengat+Maran致敬|3275302|entityMap^0|N|C|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

In Spring STS, Right click the project &amp; select "Open Project", This provision do the necessary action on the background &amp; bring the project back to work space.

Thanks &amp; Regards
Vengat Maran

blocks|key|316575|text|我在Java1.6上运行一个应用程序时遇到了这个问题，而我有用于不同应用程序的Java6，7，8的所有三个版本。我访问了导航器视图，并手动从facet.core.xml+.Clean构建和wallah中删除了不需要的方面！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316576|<?xml+version="1.0"+encoding="UTF-8"?>|code-block|syntax|javascript|316577|​|316578|<fixed+facet="jst.java"/>

<fixed+facet="jst.web"/>

<installed+facet="jst.web"+version="2.4"/>

<installed+facet="jst.java"+version="6.0"/>

<installed+facet="jst.utility"+version="1.0"/>|316579|316580|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|O|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|K|3|H|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

I encountered this issue while running an app on Java 1.6 while I have all three versions of Java 6,7,8 for different apps.I accessed the Navigator View and manually removed the unwanted facet from the facet.core.xml .Clean build and wallah!

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
</code></pre>



<pre><code>&lt;fixed facet="jst.java"/&gt;

&lt;fixed facet="jst.web"/&gt;

&lt;installed facet="jst.web" version="2.4"/&gt;

&lt;installed facet="jst.java" version="6.0"/&gt;

&lt;installed facet="jst.utility" version="1.0"/&gt;
</code></pre>

Eclipse's "problems" tab is displaying this error:

<blockquote>
 Description: Java compiler level does not match the version of the installed Java project facet. 
 Resource: groupping 
 Path: [blank] 
 Location: Unknown 
 Type: Faceted Project Problem (Java Version Mismatch)
</blockquote>

My <code>pom.xml</code> has this setting:

<pre><code>&lt;plugins&gt;
 &lt;plugin&gt;
 &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
 &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
 &lt;configuration&gt;
 &lt;source&gt;1.6&lt;/source&gt;
 &lt;target&gt;1.6&lt;/target&gt;
 &lt;/configuration&gt;
 &lt;/plugin&gt;
&lt;/plugins&gt;
</code></pre>

Where else could the settings be mismatched?

"Faceted Project Problem (Java Version Mismatch)" error message

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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Eclipse的"problems“选项卡显示以下错误：描述: Java编译器级别与安装的Java项目方面的版本不匹配。资源:分组路径:空白位置:未知类型:多面项目问题(Java版本不匹配)我的pom.xml有这样的设置：<plugins> <plugin> <groupId>org.apache....

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