blocks|key|306569|text|在Eclipse中从您的项目中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|306570|306571|右键单击您的项目库，然后单击构建路径：|ordered-list-item|306572|；删除"JRE+System+LibraryJ2SE+1.4“|306573|单击Add+|offset|length|style|BOLD|306574|306575|+->+JRE+System+Library|306576|Select新的”执行环境“或工作区默认JRE<代码>H216<代码>G217|306577|306578|entityMap^0|0|0|0|0|2|4|0|0|4|I|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|Z|8|@$J|10|K|11|L|M]]|9|@]|A|$]]|$1|N|3|-4|5|E|7|12|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|13|8|@$J|14|K|15|L|M]]|9|@]|A|$]]|$1|Q|3|R|5|E|7|16|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|U|$]]

In Eclipse from your project:

<ol>
<li>Right-click on your project</li>
<li>Click Properties</li>
<li>Java build path: Libraries; Remove the "JRE System Library[J2SE 1.4]"</li>
<li>Click Add Library -> JRE System Library</li>
<li>Select the new "Execution Environment" or Workspace default JRE</li>
</ol>

blocks|key|3035782|text|无论您使用的是maven+eclipse插件还是m2eclipse，Eclipse的项目配置都是从POM派生的，因此您需要将maven编译器插件配置为1.6+(缺省为1.4)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3035783|将以下内容添加到项目的pom.xml中，保存，然后转到Eclipse项目并选择Properties+>+Maven+>+Update+project+Configuration：|style|CODE|3035784|<project>
+<build>
++<pluginManagement>
+++<plugins>
++++<plugin>
++++++++<groupId>org.apache.maven.plugins</groupId>
++++++++<artifactId>maven-compiler-plugin</artifactId>++++++++++
++++++++<configuration>
++++++++++++<source>1.6</source>
++++++++++++<target>1.6</target>
++++++++</configuration>
++++</plugin>
+++</plugins>
++</pluginManagement>
+</build>
</project>|code-block|syntax|javascript|3035785|entityMap|0|LINK|mutability|MUTABLE|url|http://www.eclipse.org/m2e/^0|O|9|0|0|B|7|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@$A|Z|B|10|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|11|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Whether you're using the maven eclipse plugin or <a href="http://www.eclipse.org/m2e/" rel="noreferrer">m2eclipse</a>, Eclipse's project configuration is derived from the POM, so you need to configure the maven compiler plugin for 1.6 (it defaults to 1.4).

Add the following to your project's <code>pom.xml</code>, save, then go to your Eclipse project and select Properties > Maven > Update Project Configuration:

<pre class="lang-xml prettyprint-override"><code>&lt;project&gt;
 &lt;build&gt;
 &lt;pluginManagement&gt;
 &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;
 &lt;/pluginManagement&gt;
 &lt;/build&gt;
&lt;/project&gt;
</code></pre>

blocks|key|3035863|text|上面的解决方案以某种方式修复了项目或解决了问题。有时你只是不想修复项目，而只是隐藏警告。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3035864|为此，请配置警告面板的内容，并确保关闭"build+path"->"JRE+System+Path+Problem“类别。此对话框的UI有点复杂/怪异/易用性受到挑战，因此您可能不得不摆弄一些选项才能让它做您想做的事情。|3035865|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|$]]

The above solutions fix the project or work around the problem in some way. Sometimes you just don't want to fix the project and just hide the warning instead. 

To do that, configure the contents of the warning panel and make sure to toggle-off the "build path"->"JRE System Path Problem" category. The UI for this dialog is a bit complex/weird/usability challenged so you might have to fiddle with a few of the options to make it do what you want.

blocks|key|3035688|text|在eclipse首选项中，转到Java->Installed+JREs->Execution+Environment并为J2SE-1.4设置一个JRE+Execution+Environment|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3035689|entityMap|0|LINK|mutability|MUTABLE|url|http://wiki.eclipse.org/EE^0|24|L|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]]]]

In eclipse preferences, go to Java->Installed JREs->Execution Environment and set up a JRE <a href="http://wiki.eclipse.org/EE" rel="nofollow noreferrer">Execution Environment</a> for J2SE-1.4

blocks|key|303765|text|此警告的实际原因是，您已将项目配置为使用比已安装的版本更早的JRE版本运行。通常，每当您将旧项目与较新的JRE配合使用时，就会发生这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|303766|这可能根本不会造成任何麻烦。但是，如果您想在保存端成为真正的，那么您应该安装正确的旧JDK。你可以在这里找到它们：http://www.oracle.com/technetwork/java/archive-139210.html|offset|length|303767|如果您随后重启eclipse，您可以进入Window+>+Preferences+>+Java+>+Installed+JRE>+Execution+Environment，并在本例中设置eclipse调用的J2SE-1.4+perfect+match。|style|BOLD|303768|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/archive-139210.html^0|0|1L|1M|0|0|35|D|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@$D|X|E|Y|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

The actual cause of this warning is that you have configured your project to run with an earlier JRE version then you have installed. Generally this occurs whenever you use old projects with newer JREs. 

This will likely cause no trouble at all. But if you want to be really on the save side, you should install the correct, old JDK. You can find them here: <a href="http://www.oracle.com/technetwork/java/archive-139210.html" rel="nofollow">http://www.oracle.com/technetwork/java/archive-139210.html</a>

If you then restart eclipse you can go into Window > Preferences > Java > Installed JREs > Execution Environments and set for in your case J2SE-1.4 the [perfect match] as eclipse calls it.

blocks|key|3035926|text|如果您有Java+1.8，那么|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3035927|您需要在pom.xml和更新项目中使用此xml部件。|3035928|+<properties>
++++<maven.compiler.target>1.8</maven.compiler.target>
++</properties>|code-block|syntax|javascript|3035929|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|$]]

If you have Java 1.8 then 

You need this xml part in pom.xml and update project.

<pre><code> &lt;properties&gt;
 &lt;maven.compiler.target&gt;1.8&lt;/maven.compiler.target&gt;
 &lt;/properties&gt;
</code></pre>

blocks|key|304672|text|正如其他人所写的，解决此警告的正确步骤是进入您的项目属性，然后单击位于左侧的Java+Build+Path。现在你会在库窗口中找到J2SE+1.5，双击它，一个新的窗口会让你选择正确的执行环境。现在选择您的版本，警告将消失。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|304673|entityMap^0|Q|2|12|F|2K|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

the correct procedure to resolve this warning, as other people write, is to go inside your project Properties and click on Java Build Path located on the left. Now you will find inside the Libraries Window the J2SE 1.5, double click on this one and a new window will give you the possibility to choose the correct Excecution Environment. Now select your version and the warning will disappear.

blocks|key|3249952|text|您是否将您的项目设置为遵循1.4标准进行编译？如果是这样的话，do+what+krock+said。或者更准确地说，您需要选择J2SE-1.4执行环境，并检查您希望在1.4兼容模式下使用的已安装JRE之一；最有可能的是，您将安装1.6+JRE，只需检查该JRE即可。或者，如果您有安装工具包，请安装1.4+JRE，并使用该工具包。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3249953|否则，请转到您的、并检查符合性是否设置为1.4。如果是，则将其更改回1.6。如果没有，请转到项目属性，检查是否有特定于项目的设置。转到Java+Compiler，如果您想要使用常规的eclipse首选项，请取消选中该选项。或者将特定于项目的设置设置为1.6，这样无论eclipse的首选项如何，它始终是1.6。|3249954|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/3138410/3357935^0|V|I|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Did you setup your project to be compiled with 1.4 compliance? If so, <a href="https://stackoverflow.com/a/3138410/3357935">do what krock said</a>. Or to be more exact you need to select the J2SE-1.4 execution environment and check one of the installed JRE that you want to use in 1.4 compliance mode; most likely you'll have a 1.6 JRE installed, just check that one. Or install a 1.4 JRE if you have a setup kit, and use that one.

Otherwise go to your Eclipse preferences, Java -> Compiler and check if the compliance is set to 1.4. If it is change it back to 1.6. If it's not go to the project properties, and check if it has project specific settings. Go to Java Compiler, and uncheck that if you want to use the general eclipse preferences. Or set the project specific settings to 1.6, so that it's always 1.6 regardless of eclipse preferences.

blocks|key|3250251|text|我在STS+(Spring+Tool+Suite)中遇到了同样的警告，如果它能以某种方式帮助某人的话。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3250252|这是源https://www.baeldung.com/eclipse-change-java-version，下面是它的摘要：|offset|length|3250253|警告:构建路径指定了执行环境javase-11。工作区中没有安装与此环境严格兼容的jres。|style|BOLD|3250254|环境：Ubuntu20.04(默认OpenJDK11)+sts4|3250255|要解决该警告，请执行以下操作：|3250256|JavaSE更改STS工作区的JRE+(默认情况下，STS使用嵌入在其插件中的JRE+)：|3250257|+VM>Directory+(浏览到您的openjdk文件夹，在我的例子中是/usr/lib/jvm/java-11-openjdk-amd64)>Finish)|ordered-list-item|3250258|Check新的JRE，然后应用并关闭JREs>Add>Standard现在配置|3250259|-|3250260|项目以使用新添加的JRE+:右键单击项目>属性>+Java+Build+Path+>在库选项卡中>删除旧的JRE，然后在Modulepath中添加库>+JRE系统库>环境(选择JavaSE-11，确保在右侧面板上选中它，并提到“完美匹配”)，应用并关闭|3250261|3250262|然后瞧！|3250263|entityMap|0|LINK|mutability|MUTABLE|url|https://www.baeldung.com/eclipse-change-java-version^0|0|3|1G|0|0|0|3|0|0|2|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|19|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1A|8|@]|9|@$D|1B|E|1C|1|1D]]|A|$]]|$1|F|3|G|5|6|7|1E|8|@$D|1F|E|1G|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|1H|8|@$D|1I|E|1J|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1K|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1L|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|1M|8|@]|9|@]|A|$]]|$1|S|3|T|5|R|7|1N|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1O|8|@]|9|@]|A|$]]|$1|W|3|X|5|R|7|1P|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1R|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|12|$13|$5|14|15|16|A|$17|18]]]]

I met the same warning in STS (Spring Tool Suite), if it may help someone somehow.
This is the source <a href="https://www.baeldung.com/eclipse-change-java-version" rel="nofollow noreferrer">https://www.baeldung.com/eclipse-change-java-version</a>, and here's a summary of it :
Warning :
build path specifies execution environment javase-11. there are no jres installed in the workspace that are strictly compatible with this environment.
Environment :
Ubuntu 20.04 (with default OpenJDK11)
STS 4
To solve the warning :
<ol>
<li>Change the JRE of the workspace of STS (By default, STS uses the JRE embedded in its plugins) :
Window&gt;Preferences&gt;Installed JREs&gt;Add&gt;Standard VM&gt;Directory (browse to your openjdk folder, in my case /usr/lib/jvm/java-11-openjdk-amd64)&gt;Finish)</li>
<li>Check the new JRE, then Apply and close</li>
<li>Now configure the spring-boot project to use the newly added JRE :
Right click on the project &gt; properties &gt; Java Build Path &gt; in Libraries tab &gt; Remove the old JRE, then in Modulepath Add Library &gt; JRE System Library &gt; Environments (choose JavaSE-11, make sure to check it on the right panel, mentionned &quot;perfect-match&quot;), Apply and Close</li>
</ol>
And voilà

blocks|key|304680|text|只需在Window->+Preferences->+Java+->+Installed+JRE中更改版本即可。检查已安装的JRE列表。然后，右键单击您的项目->属性->+Java+build+path+->库。将"JRE系统库“更改为”已安装的JRE“中的版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|304681|警告将会消失。|304682|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|$]]

Just change the version in Window-> Preferences-> Java -> Installed JREs. Check the installed JREs list. 
Then, Right-click on your project -> properties -> Java build path -> libraries. Change the "JRE System Library" to the version in "installed JREs". 

The warning will be gone.

blocks|key|303795|text|我收到了项目警告，因为“构建路径指定了执行环境J2SE-1.5.工作区中没有安装与此环境严格兼容的are”。我删除了J2SE1.5库并添加了新的JRE系统库，从而解决了我的问题|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|303796|entityMap^0|C|W|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|$]]

I was getting project warning as "Build path specifies execution environment J2SE-1.5. There are no JREs installed in the workspace that are strictly compatible with this environment". 
I removed the J2SE1.5 library and added new JRE System Library which resolved my problem

blocks|key|3035966|text|在work+space>>Right中展开项目，单击(+JRE+System+Libraries)>>select+properties>>selectworkspace+default+JRE上述解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3035967|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|$]]

Expand your project in work space>>Right click(JRE System Libraries)>>select properties>>selectworkspace default JRE 
the above solution sol

I create a Maven project in Eclipse Helios. It works fine for a day, but then this warning shows up:

<blockquote>
 Build path specifies execution environment J2SE-1.4. There are no JREs installed in the workspace that are strictly compatible with this environment. 
</blockquote>

Since this message, the project stopped compiling and debugging. Does anyone have solution for this problem?

Warning - Build path specifies execution environment J2SE-1.4

编译器

Eclipse

Java

我在Eclipse Helios中创建了一个Maven项目。它可以在一天内正常工作，但随后会出现以下警告：构建路径指定执行环境J2SE-1.4。工作区中没有安装与此环境严格兼容的JRE。由于此消息，项目停止编译和调试。有谁有解决这个问题的办法吗？

问警告-构建路径指定执行环境J2SE-1.4
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