blocks|key|4550978|text|假设您正在使用一些IDE，比如Eclipse。在IDE中使用JDK1.8时，需要更新IDE以支持版本1.8。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4550979|使用新jdk的特性与否并不重要，但编译器必须加载新的JRE文件才能编译项目。|4550980|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|$]]

Assuming you are using some IDE, like Eclipse. When you are using jdk 1.8 with IDE, you need to update your IDE to support version 1.8. 

It does not matter you are using new jdk's feature or not, but compiler has to load new JRE files in order to compile your project.

blocks|key|4218492|text|如果使用的是IntelliJ，请转到：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4218493|File/Settings/Build,+Execution,+Deployment/Compiler/Java+Compiler|code-block|syntax|javascript|4218494|并确保“使用编译器”和"Project版本“具有正确的配置。|4218495|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you are using IntelliJ, go to:

<pre><code>File/Settings/Build, Execution, Deployment/Compiler/Java Compiler
</code></pre>

and make sure "Use compiler" and "Project bytecode version" have the right configuration.

blocks|key|49202|text|我也犯了同样的错误，并尝试了许多方法来修复它，但最终的解决方法非常简单:我只是使用了一个旧版本的Eclipse，它不支持与我的JRE一样高的Java“遵从级别”设置。我只是升级到了一个更新的版本，问题就解决了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|49203|根据我对“遵从级别”的理解，这是您的程序应该使用的Java版本。我从网上看到的东西中发现了很多。但是，其他解决方案没有提到的是，您的IDE必须能够设置到与您的JRE一样高的级别。在我的例子中，我使用的是JRE+1.8，但是我支持的旧IDE支持的最高遵从级别是1.6。|49204|IMO，Eclipse应该将此情况标记为错误。但事实上，我花了两个晚上想办法解决这个问题。|49205|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 this same error and tried many things to fix it, but finally worked was remarkably simple: It turns that I was simply using an older version of Eclipse that did not support a "Compliance Level" setting of Java that was as high as my JRE. I merely upgraded to a newer version and the problem went away.

From what I understand about "Compliance Level", it's the version of Java that your program is supposed to work on. That much I found out from reading stuff on the net. But what the other solutions did not mention is that your IDE has to be able to be set to a level as high as your JRE. In my case, I was using JRE 1.8, but the highest compliance level my older IDE supported was 1.6.

IMO, this situation should have been flagged as an error by Eclipse. But as it was, I wasted two nights trying to figure this out.

blocks|key|4218389|text|您的项目构建路径可能指的是jre而不是JDK。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4218390|走你的建屋之路。(在eclipse中，右键单击并选择构建路径)。转到库中，用jdk替换jre。|4218391|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|$]]

Your project build path could be referring to a jre instead of JDK.

Go to your build path. (In eclipse right click and choose build path).
Go to your libraries and replace the jre with the jdk.

blocks|key|49121|text|pom.xml版本是1.6？如果是这样，您将用and+1.6替换and+1.8，将环境变量替换为and+1.6。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|49122|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|$]]

pom.xml version is 1.6?
If this is the way,you would replace jdk1.8 with jdk1.6 ，and environment variable into jdk1.6。

blocks|key|49143|text|同样的奇怪的问题也发生了。结果发现，JAVA_HOME中的jdk版本错了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|49144|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|$]]

Same strange problem occurred. It turned out that wrong jdk version was in JAVA_HOME

blocks|key|4218573|text|你在这里，我有同样的问题，但我一看到你的问题，我就把它解决了。问题是您没有使用旧版本，因为引用与新版本不匹配。这个错误就会出现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4218574|工作范围：|4218575|将您的java版本更改为旧版本。(在我的例子中，我不得不更改为7)|ordered-list-item|4218576|更新每个与java+8兼容的libray和jar文件，这样它将引用java而不是类文件。|4218577|下面是环境变量在我的问题中的形象|4218578|📷|atomic|offset|length|4218579|​|4218580|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/3739b9e686fcc19d76acc15e62e9aa8d.jpg|imageAlt^0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|14|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|15|8|@]|9|@$N|16|O|17|1|18]]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

There you are I had the same issue but moment I saw your question i got it fixed. problem is you are not using old version since there is mismatch of referencing with new version. this error will come. 
Work around: 
1. Change your java version to old.(In my case I had to change to 7) 
2. Update each libray and jar file compatible to java 8 that way it will refer java not class file 

Here is the image of environment variable in my problem 
<a href="https://i.stack.imgur.com/rf44j.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/rf44j.jpg" alt="enter image description here"></a>

blocks|key|4551161|text|检查构建路径是否设置为与JDK一起运行。重要的一点是，JKD是软件开发工具包，而JRE是运行时env。有此问题的建议请参阅JDK、JRE和JVM之间的不同之处。https://www.guru99.com/difference-between-jdk-jre-jvm.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4551162|entityMap|0|LINK|mutability|MUTABLE|url|https://www.guru99.com/difference-between-jdk-jre-jvm.html^0|28|1M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

check if build path is set to run with JDK. It is important point that JKD is software development kit while JRE is a runtime env. Advice who had this problem see the different between JDK, JRE and JVM. <a href="https://www.guru99.com/difference-between-jdk-jre-jvm.html" rel="nofollow noreferrer">https://www.guru99.com/difference-between-jdk-jre-jvm.html</a>

<pre><code>The type java.util.Comparator cannot be resolved. It is indirectly referenced from required .class files
</code></pre>

I recently installed Java 8. While executing an application, I got above mentioned error can you please help me.

I am using:

<ol>
<li>Java - jdk1.8.0_51</li>
<li>Tomcat - apache-tomcat-5.5.26</li>
</ol>

The type java.util.Comparator cannot be resolved

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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The type java.util.Comparator cannot be resolved. It is indirectly referenced from required .class files我最近安装了Java 8。在执行一个应用程序时，我得到了上面提到的错误，请您帮助我。我正在使用：Java - jdk1.8.0_51Tomcat - apache-tomcat-5.5.26

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