blocks|key|253617|text|转到Window+->+Preferences...->+Java+->安装的JRE|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253618|编辑JRE+Home+=+JAVA_HOME或JAVA_HOME\jre|253619|例如，如果使用安装在C:\Program+Files中的jdk1.6.0_04，请执行以下更改：|253620|C:\Program+Files或C:\Program+Files\Java\jdk1.6.0_04，而不是默认的C:\Program+Files\Java\jre7|253621|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Go to Window -> Preferences... -> Java -> Installed JREs

Edit JRE Home = JAVA_HOME or JAVA_HOME\jre

For example if you use jdk1.6.0_04 which is installed in C:\Program Files, do the following change:

C:\Program Files\Java\jdk1.6.0_04\jre or C:\Program Files\Java\jdk1.6.0_04 instead of the default one which is at C:\Program Files\Java\jre7

blocks|key|470474|text|JDK_HOME变量应该始终指向jdk的基目录，而不是bin目录：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|470475|D:\name\name\core+java\software\Java\Java_1.6.0_04_win\jdk1.6.0_04|code-block|syntax|javascript|470476|定义，将你的路径固定为|470477|C:\Windows\System32;D:\name\name1\Softwares\Maven\apache-maven-3.0.4\bin;C:\Program+Files\Notepad%2B%2B\;%25JDK_HOME%25\bin|470478|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The JDK_HOME variable should always point to the base dir of the jdk, not the bin dir:

<pre><code>D:\name\name\core java\software\Java\Java_1.6.0_04_win\jdk1.6.0_04
</code></pre>

That defined, fix your path to be 

<pre><code>C:\Windows\System32;D:\name\name1\Softwares\Maven\apache-maven-3.0.4\bin;C:\Program Files\Notepad++\;%JDK_HOME%\bin
</code></pre>

blocks|key|253591|text|这是一个Eclipse问题。当我尝试使用以下命令行构建它时|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253592|mvn+package|code-block|syntax|javascript|253593|它工作得很好。|253594|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|$]]

It was an Eclipse problem. When I tried to build it from the command line using 

<pre><code>mvn package
</code></pre>

it worked fine.

blocks|key|253555|text|听起来好像您已经将JDK_HOME定义为用户变量，将PATH定义为系统变量，反之亦然-+echo+%25PATH%25不应该包含像...;%25JDK_HOME%25这样的未解析变量。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|253556|确保%25JDK_HOME%25\bin路径在您的path变量中，即使您必须显式地将路径放入其中，也要确保该路径未解析。|253557|entityMap^0|9|8|Q|4|18|B|1P|E|0|2|E|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

It sounds like you have <code>JDK_HOME</code> defined as a user variable and <code>PATH</code> defined as a System variable, or vice versa - <code>echo %PATH%</code> should not contain unresolved variables like <code>...;%JDK_HOME%</code>.

Make sure that the <code>%JDK_HOME%\bin</code> path is on your PATH variable, unresolved, even if you have to put the path in explicitly.

blocks|key|470548|text|我也犯了同样的错误，因为JUNIT版本，我的版本是3+3.8.1，我已经改成了4.8.1。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|470549|所以解决方案是|470550|您必须转到POM，并确保您的依赖项如下所示|470551|+<dependency>
++<groupId>junit</groupId>
++<artifactId>junit</artifactId>
++<version>4.8.1</version>
++<scope>test</scope>
</dependency>|code-block|syntax|javascript|470552|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|$]]

I had the same Error, because of JUNIT version, I had 3 
 3.8.1 and I have changed to 4.8.1. 

so the solution is 

you have to go to POM, and make sure that you dependency looks like this 

<pre><code> &lt;dependency&gt;
 &lt;groupId&gt;junit&lt;/groupId&gt;
 &lt;artifactId&gt;junit&lt;/artifactId&gt;
 &lt;version&gt;4.8.1&lt;/version&gt;
 &lt;scope&gt;test&lt;/scope&gt;
&lt;/dependency&gt;
</code></pre>

blocks|key|470712|text|我尝试了上面所有的建议，这些建议对我都不起作用，但我找到了修复我的错误的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|470713|以下步骤使项目编译成功：|470714|在项目资源管理器中，右键单击项目，在右侧的树中选择“properties”，转到Java+build+path。选择“库”选项卡。单击“添加库”。选择JRE系统库。单击下一步。选择单选按钮Alternate+JRE。单击“已安装的JRE”。选择具有正确版本的JRE。单击Appy+and+close。在下一个屏幕中，单击finish。在“属性”窗口中，单击“应用并关闭”。在项目资源管理器中，右键单击您的pom.xml并在目标文本框中选择run+as+>+maven+build，然后编写“install”。单击Run。|470715|这使得项目在我的例子中构建成功。|470716|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I tried all of the above suggestions, which did not work for me, but I found how to fix the error in my case.

The following steps made the project compile succesfully:

In project explorer, right-click on project, select “properties”
In the tree on the right, go to Java build path. Select the tab “libraries”. 
Click “Add library”. 
Select JRE system library. Click next.
Select radio button Alternate JRE. Click “installed JRE’s”. Select the JRE with the right version. Click Appy and close. In the next screen, click finish.
In the properties window, click Apply and close.
In the project explorer, right-click your pom.xml and select run as > maven build
In the goal textbox, write “install”. Click Run.

This made the project build succesfully in my case.

blocks|key|470573|text|在Eclipse中，像导入Maven项目或调用"Update+Sources“这样的操作在运行Eclipse的同一个JVM中运行。如果JVM来自不是JDK一部分的JRE，就不会有Java编译器(+tools.jar)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|470574|因此，要从Eclipse中启动Maven，用于启动的JRE也需要来自JDK。默认情况下，Eclipse注册的是JRE，但这可以在上面Parthasarathy提到的"Window+/+Preferences…/+Java+/+Installed+JRE“首选项页面上进行配置|470575|或者，您可以在pom.xml中指定JDK，这样Maven在编译Java代码时就不会寻找JDK：|470576|+<plugin>
++<artifactid>maven-compiler-plugin</artifactid>
++<configuration>
++++<compilerid>eclipse</compilerid>
++</configuration>
++<dependencies>
++++<dependency>
++++++<groupid>org.codehaus.plexus</groupid>
++++++<artifactid>plexus-compiler-eclipse</artifactid>
++++++<version>xxxx</version>
++++</dependency>
++</dependencies>
</plugin>|code-block|syntax|javascript|470577|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|$]]

In Eclipse, actions like importing Maven projects or invoking "Update Sources" runs in the same JVM in which Eclipse is running. If that JVM comes from JRE that isn’t part of JDK, there would be no Java compiler (the tools.jar).

So to launch Maven from within Eclipse, JRE used for launch also need to come from JDK. By default Eclipse registers JRE it is started in, but this can be configured on "Window / Preferences… / Java / Installed JREs" preference page as mentioned above by Parthasarathy 

Alternatively you can specify compilerId in the pom.xml, so Maven won’t be looking for JDK when compiling Java code: 

<pre><code> &lt;plugin&gt;
 &lt;artifactid&gt;maven-compiler-plugin&lt;/artifactid&gt;
 &lt;configuration&gt;
 &lt;compilerid&gt;eclipse&lt;/compilerid&gt;
 &lt;/configuration&gt;
 &lt;dependencies&gt;
 &lt;dependency&gt;
 &lt;groupid&gt;org.codehaus.plexus&lt;/groupid&gt;
 &lt;artifactid&gt;plexus-compiler-eclipse&lt;/artifactid&gt;
 &lt;version&gt;xxxx&lt;/version&gt;
 &lt;/dependency&gt;
 &lt;/dependencies&gt;
&lt;/plugin&gt;
</code></pre>

blocks|key|470621|text|这取决于Maven的版本。当您要安装较新版本的Maven时，不会出现此错误。您还可以使用tools.jar文件lib/tools.jar添加另一个目录-它也可以解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|470622|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|$]]

It depends on of Maven version. When you will install newer version of Maven, this error would not appear. You may also add another directory with tools.jar file lib/tools.jar - it also solve this problem.

blocks|key|253736|text|如果你，我们正在做的所有上述步骤可能会被混淆，我们的问题只是缺少tools.jre，所以只需通过以下步骤添加tools.jre，问题就解决了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253737|第1步:在eclipse中转到Windows+->首选项|253738|步骤2:+Java+->安装的JRE(双击它)|253739|第3步:单击编辑按钮->单击添加外部JAR|253740|步骤4:现在选择tools.jar路径|253741|现在应用更改，它工作得很好。|253742|Here+is+screenshoot|offset|length|253743|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/aBM8z.png^0|0|0|0|0|0|0|0|J|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@$N|14|O|15|1|16]]|A|$]]|$1|P|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]]]

If you we are doing all above steps that may be confused and our problem is just missing tools.jre so just add tools.jre by the following steps and problem is solved.

Step 1 : In eclipse go to Windows -> preferences

Step 2 : Java -> Installed JREs (Double click on it)

Step 3 : Click Edit button -> Click Add External JARs

Step 4 : Now select tools.jar path 

now apply changes and it works fine.

<a href="https://i.stack.imgur.com/aBM8z.png" rel="nofollow noreferrer">Here is screenshoot</a>

blocks|key|253776|text|尽管上面有一些非Eclipse的答案没有提到Eclipse，但它们需要更改path变量。另一种方法是使用命令行选项java.home，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|253777|mvn+package+-Djava.home="C:\Program+Files\Java\jdk1.8.0_161\jre"|code-block|syntax|javascript|253778|注意末尾的\jre+-一个令人惊讶的必要性。|253779|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|$]]

Though there are a few non-Eclipse answers above for this question that does not mention Eclipse, they require path variable changes. An alternative is to use the command line option, java.home, e.g.:

<pre><code>mvn package -Djava.home="C:\Program Files\Java\jdk1.8.0_161\jre"
</code></pre>

Notice the \jre at the end - a surprising necessity.

When i try to generate a war file, it is showing some error like 

<pre><code>[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre7\..\lib\tools.jar
</code></pre>

When i do <code>echo %path%</code> it shows

<pre><code> C:\Windows\System32;D:\name\name1\Softwares\Maven\apache-maven-3.0.4\b
in;C:\Program Files\Notepad++\;%JDK_HOME%
</code></pre>

When i do <code>echo %JDK_HOME%</code>

<pre><code>D:\name\name\core java\software\Java\Java_1.6.0_04_win\jdk1.6.0_04\bin
</code></pre>

I don't know why maven is refering to jre, when my environmental variable is jdk. I also changes installed JRE to jdk1.6.

Maven Unable to locate the Javac Compiler in:

编译器

Windows

Eclipse

Java

当我尝试生成一个war文件时，它显示了一些错误，比如[ERROR] Unable to locate the Javac Compiler in:[ERROR] C:\Program Files\Java\jre7\..\lib\tools.jar当我执行echo %path%时，它会显示 C:\Windows\System32;D:\name\name1\Softwares\Maven\apac

问Maven无法在以下位置找到Javac编译器：
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回答 10

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问Maven无法在以下位置找到Javac编译器：
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