blocks|key|2634775|text|53代表java-9，所以它意味着您拥有的任何类都是使用javac-9编译的，并且您尝试使用jre-8运行它。或者使用javac-8重新编译该类，或者使用jre-9|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2634776|entityMap^0|0|2|S|7|1A|5|1N|7|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]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

<code>53</code> stands for java-9, so it means that whatever class you have has been compiled with <code>javac-9</code> and you try to run it with <code>jre-8</code>. Either re-compile that class with <code>javac-8</code> or use the jre-9

blocks|key|99319|text|这只是一个版本不匹配。您已使用java版本9编译代码，而您当前的JRE是版本8。请尝试将您的JRE升级到9。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99320|49+=+Java+5
50+=+Java+6
51+=+Java+7
52+=+Java+8
53+=+Java+9
54+=+Java+10
55+=+Java+11
56+=+Java+12
57+=+Java+13
58+=+Java+14|code-block|syntax|javascript|99321|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is just a version mismatch. You have compiled your code using java version 9 and your current JRE is version 8. Try upgrading your JRE to 9.

<pre><code>49 = Java 5
50 = Java 6
51 = Java 7
52 = Java 8
53 = Java 9
54 = Java 10
55 = Java 11
56 = Java 12
57 = Java 13
58 = Java 14
</code></pre>

blocks|key|2634865|text|IDE:+Eclipse+Oxygen.3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2634866|要临时解决此问题，请执行以下操作：|2634867|Project+menu+>+Properties+>+Java+Compiler+>+Compiler+compliance+level+>+1.8|offset|length|style|CODE|2634868|永久修复可能涉及到安装JDK+9。|2634869|FYI+1.8是Java+8的叫法。|2634870|侧栏|2634871|最近，在尝试了C#+(一种新鲜空气)之后，我回到了Java，并将Eclipse+Oxygen安装到了一个以前从未安装过Java的干净系统上。这个默认所有的都安装了一个全新的Eclipse，但是不知何故，它不能获得自己的参数来匹配安装的JDK.这是我创建的第二个项目，也是我第二次遇到这种令人头疼的问题。是时候回到C#了吗？|BOLD|2634872|相关问题|2634873|has+been+compiled+by+a+more+recent+version+of+the+Java+Runtime+(class+file+version+53.0)|2634874|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/47876051/has-been-compiled-by-a-more-recent-version-of-the-java-runtime-class-file-versi/^0|0|0|0|C|F|A|S|D|18|P|20|3|0|0|0|0|20|5|0|0|0|2G|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|16|8|@$F|17|G|18|H|I]|$F|19|G|1A|H|I]|$F|1B|G|1C|H|I]|$F|1D|G|1E|H|I]|$F|1F|G|1G|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1H|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1I|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1J|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1K|8|@$F|1L|G|1M|H|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1N|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1O|8|@]|9|@$F|1P|G|1Q|1|1R]]|A|$]]|$1|W|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

<h2>IDE: Eclipse Oxygen.3</h2>

To temporarily correct the problem do the following:

<code>Project menu</code> > <code>Properties</code> > <code>Java Compiler</code> > <code>Compiler compliance level</code> > <code>1.8</code>

A permanent fix likely involves installing JDK 9.

FYI 1.8 is what Java 8 is called.

<h2>Side bar</h2>

I recently returned to Java after a foray into C# (a breath of fresh air) and installed Eclipse Oxygen onto a clean system that had never had Java installed on it before. This default everything with a brand new install of Eclipse Oxygen yet somehow or other Eclipse can't get its own parameters to match the jdk that's installed. This is the second project I created and the second time I ran into this headache. Time to go back to C#?

<h2>Related Question</h2>

<a href="https://stackoverflow.com/questions/47876051/has-been-compiled-by-a-more-recent-version-of-the-java-runtime-class-file-versi/">has been compiled by a more recent version of the Java Runtime (class file version 53.0)</a>

blocks|key|2846519|text|转到项目部分，单击属性>然后转到Java编译器>检查编译器遵从性级别是否为1.8，否则底部将不会出现黄色警告|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2846520|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|$]]

Go to Project section, click on properties > then to Java compiler > check compiler compliance level is 1.8 , or there should be no yellow warning at bottom

blocks|key|2846565|text|刷新gradle依赖项对我来说很有效:右键单击项目->+Gradle+->刷新Gradle项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2846566|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|$]]

Refreshing gradle dependencies works for me: Right click over the project -> Gradle -> Refresh Gradle Project.

blocks|key|2846568|text|你可以试试这种方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2846569|javac+--release+8+yourClass.java|code-block|syntax|javascript|2846570|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try this way

<pre><code>javac --release 8 yourClass.java
</code></pre>

blocks|key|2846605|text|我写这篇文章是因为我发现其他答案很难理解。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2846606|实际上，您的JRE没有更新和/或Eclipse没有配置为使用最新的JRE。|2846607|在Windows上，转到控制面板->程序->+Java+->更新，然后继续更新java|2846608|或者，如果您没有Java，请访问Oracle的网站并下载最新的JRE。|2846609|完成后，进入eclipse，在项目视图下，右键单击您的项目，选择Java+Build+Path，双击JRE+System+Library，然后选择Workspace+Default+JRE14.1。|2846610|如果这里没有显示最新版本的Java，那么可能没有安装它。检查您的JRE(不是JDK)版本，并确保它是最新的。如果是，请尝试重新启动计算机，然后重试。|2846611|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

I'm writing this because I found the other answers hard to understand. 

Essentially your JRE is not updated and/or Eclipse is not configured to use the most recent JRE. 

On Windows, go to Control Panel -> Programs -> Java -> update and proceed to update java

or if you don't have Java, go to Oracle's website and download the most recent JRE.

Once this is done, go into eclipse, and under the project view, right click on your project, select Java Build Path, double click on JRE System Library, then Select Workspace Default JRE 14.1.

If a recent version of Java doesn't show up here, it probably isn't installed. Check you JRE(NOT JDK) version and make sure it's recent. If it is, try restarting the computer then trying this again.

blocks|key|102348|text|对于临时解决方案，只需在那里右键单击项目=>属性=>+Java编译器=>，请选择编译器遵从性级别1.8+=>+.class兼容性1.8+=>源代码兼容性1.8。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|102349|然后，您的代码将开始在版本1.8上执行。|102350|entityMap^0|I|1P|0|D|3|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|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

For temporary solution just right click on Project =&gt; Properties =&gt; Java compiler =&gt; over there please select compiler compliance level 1.8 =&gt; .class compatibility 1.8 =&gt; source compatibility 1.8.
Then your code will start to execute on version 1.8.

blocks|key|2635044|text|在Intellij中构建Jar之后，我在控制台上遇到了类似的问题。使用更新到较新的版本()不起作用，并停留在版本1.8+(Java8)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2635045|要在本地切换到更新的版本，我必须从https://www.oracle.com/uk/java/technologies/javase-jdk15-downloads.html安装Java15JDK，并将其添加到我的Java运行时环境设置中。|offset|length|2635046|​|2635047|📷|atomic|2635048|2635049|entityMap|0|LINK|mutability|MUTABLE|url|https://www.oracle.com/uk/java/technologies/javase-jdk15-downloads.html|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/219134335648ab6f9ec05469e641a35d.png|imageAlt^0|0|H|1Z|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|15|8|@]|9|@$D|16|E|17|1|18]]|A|$]]|$1|K|3|G|5|6|7|19|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|U|P|V|A|$W|X|Y|-4]]]]

I had a similar issue from the console after building a Jar in Intellij. Using the Java configuration to update to a newer version (Windows -&gt; Configure Java -&gt; Update -&gt; Update Now) didn't work and stuck at version 1.8 (Java 8).
To switch to a more recent version locally I had to install the Java 15 JDK from <a href="https://www.oracle.com/uk/java/technologies/javase-jdk15-downloads.html" rel="nofollow noreferrer">https://www.oracle.com/uk/java/technologies/javase-jdk15-downloads.html</a> and add that to my Java runtime environment settings.
<a href="https://i.stack.imgur.com/r5Cb8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/r5Cb8.png" alt="Java Runtime Environment Settings" /></a>

blocks|key|102428|text|你的JDK版本:java8|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|102429|你的JRE版本:Java9|102430|在这里，您的JRE版本与JDK版本不同。在这里，您可以使用JDK版本1.8编译所有java类。如果只想编译一个java类，只需将*.java更改为<yourclassname>.java。|CODE|102431|javac+-source+1.8+-target+1.8++*.java|code-block|syntax|javascript|102432|源:您的源代码编译所需的版本。|102433|JRE+:您想要支持的最早的版本。|102434|entityMap^0|0|D|0|0|D|0|1S|6|21|K|0|0|0|F|0|E|3|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|11|8|@$9|12|A|13|B|J]|$9|14|A|15|B|J]]|D|@]|E|$]]|$1|K|3|L|5|M|7|16|8|@]|D|@]|E|$N|O]]|$1|P|3|Q|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|1A|8|@$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|U|$]]

Your JDK version: Java 8 
Your JRE version: Java 9
Here your JRE version is different than the JDK version that's the case. Here you can compile all the java classes using JDK version 1.8. If you want to compile only one java class just change the <code>*.java</code> into <code>&lt;yourclassname&gt;.java</code>
<pre><code>javac -source 1.8 -target 1.8 *.java
</code></pre>
source: The version that your source code requires to compile. 
target: The oldest JRE version you want to support.

blocks|key|100082|text|您应该检查您的Project方面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100083|项目属性>项目方面|100084|将java版本更改为您正在使用的版本。这对我来说很有效！|100085|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|$]]

You should check your Project Facets.
Project Properties &gt; Project Facets
Change java version to the same version you are using. That work for me!

blocks|key|2846809|text|：Eclipse+2021-09+IDE|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2846810|这是因为您已经使用java+version9编译了代码并安装了java8。你不需要更新就能解决这个问题。|2846811|右键单击项目>属性>+Java编译器>取消勾选-启用项目特定设置>配置工作区设置>勾选-使用默认遵从性设置>+Apply+|2846812|+Close。|blockquote|2846813|2846814|2846815|2846816|现在，您的代码应该可以正确执行了。|2846817|entityMap^0|1|J|0|0|1G|0|0|1P|0|0|7|0|0|0|0|0|H|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|15|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|S|$]]

IDE : Eclipse 2021-09
This is caused because you have compiled the code with java version 9 and have java8 installed. You don't have to update to solve this issue.
<blockquote>
Right click on project &gt; properties &gt; Java Compiler &gt; untick-Enable
project specific settings &gt; configure workspace settings &gt; tick-Use
default compliance settings &gt; Apply and Close.
</blockquote>
<hr />
Now your code should be executed properly.

blocks|key|2846841|text|这是一个例子，如果您的计算机运行在旧版本的java上，而Neo4J是在最新版本上编译的，请尝试在您的计算机上安装相同的版本或更高版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2846842|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|$]]

This is getting as an example
if your computer running on an older version of java and the Neo4J is compiled on the latest version, please try to install the same version or upper to your computer.

While running selenium script, I am getting the following error message in Eclipse console:

<blockquote>
 Class has been compiled by a more recent version of the Java Environment (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0.
</blockquote>

<hr>

<ul>
<li>Java Version: <code>8</code></li>
<li>IDE: <code>Eclipse Oxygen</code></li>
<li>Firefox Version: <code>46</code></li>
</ul>

Class has been compiled by a more recent version of the Java Environment

运行selenium脚本时，我在Eclipse控制台中收到以下错误消息：Java类已由较新版本的环境(类文件版本53.0)编译，此版本的Java Runtime仅识别52.0之前的类文件版本。Java版本：8IDE：Eclipse OxygenFirefox版本：46

问类已由更新版本的Java环境编译
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