blocks|key|707886|text|是的，您已经下载并安装了Java+Runtime+Environment+(JRE)，而不是Java+Development+Kit+(JDK)。后者有tools.jar、java.exe、javac.exe等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|707887|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|$]]

Yes, you've downloaded and installed the Java Runtime Environment (JRE) instead of the Java Development Kit (JDK). The latter has the tools.jar, java.exe, javac.exe, etc.

blocks|key|708035|text|如果这对任何人来说仍然是一个问题，我对前面的答案有一点澄清。我在使用ant时遇到了同样的问题，但只安装了一个JDK。尽管如此，JDK安装程序给了我一个类似如下的目录结构：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708036|+Directory+of+C:\Program+Files\Java

05/08/2012++09:43+AM++++<DIR>++++++++++.
05/08/2012++09:43+AM++++<DIR>++++++++++..
05/08/2012++09:46+AM++++<DIR>++++++++++jdk1.7.0_04
05/08/2012++09:19+AM++++<DIR>++++++++++jre6
05/08/2012++09:44+AM++++<DIR>++++++++++jre7
+++++++++++++++0+File(s)++++++++++++++0+bytes|code-block|syntax|javascript|708037|当我运行ant时，它抱怨在jre7子目录下找不到tools.jar。直到我使用set+"JAVA_HOME=C:\Program+Files\Java\jdk1.7.0_04"，这个错误才消失。|offset|length|style|CODE|708038|entityMap^0|0|0|13|1D|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In case this is still an issue for anyone, I have a bit of clarification on the previous answers. I was running into this same issue using ant with only a JDK installed. Although, the JDK installer gave me a directory structure like this:

<pre class="lang-none prettyprint-override"><code> Directory of C:\Program Files\Java

05/08/2012 09:43 AM &lt;DIR&gt; .
05/08/2012 09:43 AM &lt;DIR&gt; ..
05/08/2012 09:46 AM &lt;DIR&gt; jdk1.7.0_04
05/08/2012 09:19 AM &lt;DIR&gt; jre6
05/08/2012 09:44 AM &lt;DIR&gt; jre7
 0 File(s) 0 bytes
</code></pre>

and when I ran ant, it complained about not finding tools.jar under the jre7 subdirectory. It wasn't until I <code>set "JAVA_HOME=C:\Program Files\Java\jdk1.7.0_04"</code> that the error went away.

blocks|key|708930|text|如果你已经安装了JDK9.0.1，你也会遇到这个问题，因为tools.jar已经被弃用了。参见migration+document。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|708931|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/9/migrate/toc.htm^0|1B|I|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]]]]

If you have installed JDK 9.0.1 you will also have this problem as the tools.jar has been deprecated. See <a href="https://docs.oracle.com/javase/9/migrate/toc.htm" rel="noreferrer">migration document</a>.

blocks|key|924531|text|将JAVA_HOME环境变量设置为指向C:\Program+Files\Java\jdk1.7.0_02。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|924532|entityMap^0|1|9|J|X|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Set your <code>JAVA_HOME</code> environmental variable to point to <code>C:\Program Files\Java\jdk1.7.0_02</code>.

blocks|key|708481|text|如果你使用的是Linux，你可以通过在系统上安装java来解决这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708482|sudo+apt-get+install+openjdk-7-jdk+openjdk-7-jre|code-block|syntax|javascript|708483|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|$]]

If you are in Linux you can solve this by installing java on the system:

<pre><code>sudo apt-get install openjdk-7-jdk openjdk-7-jre
</code></pre>

blocks|key|924194|text|不，根据您的目录结构，您安装的是JRE，而不是JDK。这是有区别的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924195|C:\Program+Files\Java\jre6\lib
++++++++++++++++++++++%5E%5E%5E%5E|code-block|syntax|javascript|924196|它应该是这样的：|924197|C:\Program+Files\Java\jdk1.6.0_24|924198|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|$]]

No, according to your directory structure, you have installed a JRE, not a JDK. There's a difference.

<pre><code>C:\Program Files\Java\jre6\lib
 ^^^^
</code></pre>

It should be something like:

<pre><code>C:\Program Files\Java\jdk1.6.0_24
</code></pre>

blocks|key|708132|text|不要花太多时间寻找tools.jar。如果你遇到这样的错误，请不要生气。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|708133|如果您已经安装了java+JDK1.5，请转到您的lib文件夹，tools.jar应该在那里可用。将其复制并粘贴到ant+bin文件夹中，然后尝试使用命令ant+-version。|708134|您应该会看到预期的结果。|708135|entityMap^0|9|9|0|P|3|W|9|1P|3|25|C|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|X|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|K|$]]

Don't spend too much time looking for <code>tools.jar</code>. If you get an error like that, don't be upset. 

If you already have java JDK 1.5, go to your <code>lib</code> folder, and the <code>tools.jar</code> should be available there. Copy and paste it in your ant <code>bin</code> folder, then try to use the command <code>ant -version</code>.

You should see the expected result.

blocks|key|708229|text|转到安装java的jdk路径。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708230|例如，在我的PC中，JDK安装在以下路径中|708231|"C:\Program+Files\Java\jdk1.7.0_17\"；|708232|在进入lib文件夹后，例如"C:\Program+Files\Java\jdk1.7.0_17\lib“|708233|在lib目录中有一个tool.jar文件|708234|复制此文件并将其传递到jre7目录的lib+forlder中，例如|708235|"C:\Program+Files\Java\jre7\lib“|708236|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|S|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

go to your jdk path where you installed your java

For e.g In my PC JDK installed in the following path

"C:\Program Files\Java\jdk1.7.0_17\";

After go to the lib folder e.g "C:\Program Files\Java\jdk1.7.0_17\lib"

in the lib directory there is tool.jar file

Copy this file and past it in the lib forlder of jre7 directory
for e.g

"C:\Program Files\Java\jre7\lib"

blocks|key|925017|text|你在Ubuntu上可能会遇到类似的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925018|Embedded+error:+tools.jar+not+found:+/usr/lib/jvm/java-7-openjdk-amd64/jre/../lib/tools.jar|code-block|syntax|javascript|925019|问题出在JAVA_HOME没有正确设置。|925020|所以，在使用Java8的Ubuntu14.04+x64上：|925021|sudo+apt-get+install+openjdk-8-jdk+openjdk-8-jre
export+JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64|925022|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You may face similar problem on Ubuntu:

<pre><code>Embedded error: tools.jar not found: /usr/lib/jvm/java-7-openjdk-amd64/jre/../lib/tools.jar
</code></pre>

The problem is with JAVA_HOME that is not set properly.

So, on Ubuntu 14.04 x64 using Java8:

<pre><code>sudo apt-get install openjdk-8-jdk openjdk-8-jre
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
</code></pre>

blocks|key|924835|text|即使在安装Java+JDK并将JAVA_HOME设置为..\jdk1.6.0_45\bin文件夹之后，我也遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|924836|Ant仍在尝试在C:\Program+Files\Java\jre6\lib文件夹中查找tools.jar。|924837|我已经通过添加JAVACMD环境变量并将其路径设置为jdk文件夹中的java.exe来修复它。|924838|在我的例子中，它是C:\Program+Files\Java\jdk1.6.0_45\bin\java.exe|924839|entityMap^0|F|9|R|I|0|8|U|18|9|0|7|7|Q|3|Y|8|0|9|1A|0^^$0|@$1|2|3|4|5|6|7|N|8|@$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]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|L|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|M|$]]

I had the same problem even after installing Java JDK and set <code>JAVA_HOME</code> to <code>..\jdk1.6.0_45\bin</code> folder. 

Ant is still trying to find <code>tools.jar</code> in <code>C:\Program Files\Java\jre6\lib</code> folder. 
I've fixed it by adding <code>JAVACMD</code> environment variable and set path for it to <code>java.exe</code> in the <code>jdk</code> folder. 
In my case it was <code>C:\Program Files\Java\jdk1.6.0_45\bin\java.exe</code>

blocks|key|708771|text|我已经在windows+os中通过在运行前设置JAVA_HOME变量解决了这个问题，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708772|设置JAVA_HOME=C:\Program+Files\Java\jdk1.8.0_111|708773|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|$]]

it has been solved with me in windows os by setting the JAVA_HOME variable before running as follows:

set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_111

blocks|key|925539|text|正如许多人提到的，看起来您是在自己的JRE中查找tools.jar文件，而不是在JDK中查找。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925540|我还想提一下，在JDK的最新版本中，不再有tools.jar文件。我今天下载了最新的JDK+(JDK版本12)，但是我找不到任何tools.jar。为了获得tools.jar文件，我必须从https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html下载JDKVersion8+(1.8.0)。我下载了那个版本，获取tools.jar文件并将其放入我最近版本的lib文件夹中。|offset|length|925541|entityMap|0|LINK|mutability|MUTABLE|url|https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html^0|0|2M|2C|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

As many people mentioned, it looks like you are looking in your JRE instead of the JDK for the tools.jar file.

I would also like to mention that on recent versions of the JDK, there is no more tools.jar file. I downloaded the most recent JDK as of today (JDK version 12) and I could not find any tools.jar. I had to download JDK version 8 (1.8.0) here <a href="https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html" rel="nofollow noreferrer">https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html</a> to get the tools.jar file. I downloaded that version, took the tools.jar file and put it into my recent version's lib folder.

blocks|key|924699|text|确保将%25JAVA_HOME%25和%25JAVA_HOME%25/bin路径添加到PATH变量中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924700|所有关于将tools.jar复制到正确位置的答案充其量都是一个糟糕的主意。|924701|确保您的IDE可以按照设计和预期的方式找到这些jars。|924702|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|$]]

Make sure that both the %JAVA_HOME% and %JAVA_HOME%/bin paths are added to your PATH variable.

All the answers about copying tools.jar into the correct position is a poor idea at best.

Make sure that your IDE can find these jars the way it was designed and intended for.

blocks|key|924919|text|在eclipse+window>+preferences>Java>中安装JRE时，我将目录指向JDK1.7中的jre目录，并为我创建了一个工作文件，例如C:\Program+Files\Java\jdk1.7.0_71\jre|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924920|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|$]]

In eclipse window> preferences>Java> Installed JRE, I pointed the directory to the jre directory in the jdk 1.7 and i worked file for me
e.g C:\Program Files\Java\jdk1.7.0_71\jre

blocks|key|924957|text|我的JDK_path+(C:\Program+Files\Java\jdk1.7.0_79)在我的JAVA_HOME中，JDK_path\bin也在我的PATH中。但是，我的ant仍然在使用JRE而不是JDK。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|924958|问题是我在PATH变量中的JDK_path之前使用了C:\ProgramData\Oracle\Java\javapath。我只是简单地将我的JDK_path移到了oracle的前面，问题就解决了。|924959|entityMap^0|C|X|1D|9|24|4|0|5|4|Q|Z|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

I had my JDK_path (<code>C:\Program Files\Java\jdk1.7.0_79</code>) in my <code>JAVA_HOME</code> and also the JDK_path\bin in my <code>PATH</code>. But, still my ant was using the JRE instead of JDK.

The issue was I had <code>C:\ProgramData\Oracle\Java\javapath</code>before my JDK_path in <code>PATH</code> variable. I simply moved my JDK_path before the oracle one and the issue solved.

blocks|key|708737|text|为了解决这个问题，我只需将tools.jar文件从C:\Program+Files\Java\jre1.8.0_112\lib复制到C:\Program+Files\Java\jdk1.8.0_112\lib，这样我就有了两个tools.jar文件，而不是一个，问题就消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708738|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|$]]

solving this problem I have simply copied the tools.jar file from C:\Program Files\Java\jre1.8.0_112\lib to C:\Program Files\Java\jdk1.8.0_112\lib so that I have two tools.jar files instead of one and problem disappeared.

blocks|key|924290|text|Expected+to+find+it+in+C:\Program+Files\Java\jre6\lib\tools.jar|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|924291|如果您已经安装了jdk，那么|unstyled|924292|..Java/jdkx.x.x|offset|length|style|CODE|924293|文件夹必须存在，所以在停止它，并给出完整的路径，如|924294|C:\Program+Files\Java\jdk1.6.0\lib\tools.jar|924295|entityMap^0|0|0|0|F|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|Q|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<pre><code>Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
</code></pre>

if you have installed jdk then 

<code>..Java/jdkx.x.x</code> 

folder must exist there so in stall it and give full path like

<pre><code>C:\Program Files\Java\jdk1.6.0\lib\tools.jar
</code></pre>

blocks|key|924369|text|确保您的类路径设置正确，并且指向您已安装的JDK的正确版本。另外，您是否在使用Open+JDK？在我尝试从开放JDK迁移到Suns+JDK之后，我曾经遇到过这个问题。This就是一个如何解决这个问题的例子。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|924370|entityMap|0|LINK|mutability|MUTABLE|url|http://www.imlucas.com/post/263896412/ubuntu-fix-for-unable-to-locate-tools-jar-expected-to^0|2B|4|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]]]]

Make sure that your classpath is set correctly and pointing to the correct version of the JDK that you have installed. Also, are you using Open JDK? I have had this issue before after I tried to move from open JDK to Suns JDK. <a href="http://www.imlucas.com/post/263896412/ubuntu-fix-for-unable-to-locate-tools-jar-expected-to" rel="nofollow">This</a> is an example of how that issue could be fixed.

blocks|key|708394|text|maven-compiler-plugin使用jdk，而不是jre，tools.jar在C:\Program+Files\Java\jdk1.6.0\lib\tools.jar中你必须用jdk而不是jar来配置project+JRE+System+Libary。这是最简单的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708395|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|$]]

maven-compiler-plugin use jdk ,not jre, 
 tools.jar is in C:\Program Files\Java\jdk1.6.0\lib\tools.jar
you must config project JRE System Libary with jdk,not jar. This is the simplest solution.

blocks|key|925174|text|对我来说起作用的是:我下载了一个旧版本的Java1.7|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925175|我实际上从C:/program+files+X86/Java中设置了我的JAVA_HOME，但是在我安装1.7版本之后，我在program+files/Java中有了另一个Java。这时我在这里找到了tools.jar。然后，我改变了这条新的道路，它起作用了|925176|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|$]]

For me what's working: I downloaded an old version of Java 1.7

I actually set my JAVA_HOME from C:/program files X86/Java BUT after I installed the 1.7 version I had another Java in program files/Java. And at this moment I found the tools.jar here. Then I changed for this new path and it's working

blocks|key|925215|text|我也面临着同样的错误。在将Java_Home路径设置为C:\Program+Files\Java\jdk1.8.0_121后，已将其删除。请确保在系统path变量中定义了jdk1.8.0_121之后，路径中不包含bin，并且在%25JAVA_HOME%25\bin之后没有斜杠。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925216|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|$]]

I was also facing the same error.
This was removed after setting Java_Home path to C:\Program Files\Java\jdk1.8.0_121.
Please ensure bin is not included in the path and no slash is there after jdk1.8.0_121 after you have defined %JAVA_HOME%\bin in the system path variable.

blocks|key|925325|text|如果您在RHEL环境中，包含tools.jar的包名应该以"openjdk-devel“结尾。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925326|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|$]]

If you're in a RHEL environment the package name containing tools.jar would end with "openjdk-devel".

blocks|key|925386|text|我已经下载了tools.jar，然后将它复制到错误消息中的路径中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925387|C:\Program+Files\Java\jdk-11.0.1\bin+>粘贴到此处tools.jar|925388|在那之后，我重启了Spring+Tool+Suit+4，一切正常。当我试图解决这个问题时，我创建了新的环境变量:控制面板/系统/高级/环境变量/新名称:jdk值:+C:\Program+Files\+JAVA_HOME+\jdk-11.0.1，但我不知道这是否必要。|925389|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 have downloaded tools.jar and after that I copied it into path in error message.

C:\Program Files\Java\jdk-11.0.1\bin > paste here tools.jar

After that I have restarted Spring Tool Suit 4 and everything was working.
When I was trying to fix that problem I have made new environmental variable:
Control Panel / System / Advenced / Environmental variables / new 
Name : JAVA_HOME
Value: C:\Program Files\Java\jdk-11.0.1
But I do not know is it necessary.

blocks|key|925472|text|也许您已经更新了OS中的JRE，并且添加的内容已经在环境变量的“路径”中添加了一个条目".../Oracle/jer“，该条目将覆盖您的JAVA_HOME。尝试通过离开JAVA_HOME将其从“路径”中删除。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925473|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|$]]

maybe you have updated the JREs in the OS, and the addition has added in the "path" of the environment variables an entry ".../Oracle/jer" that overwrites your JAVA_HOME.
try to remove it from the "path" by leaving JAVA_HOME.

blocks|key|925575|text|如果它有帮助，对我来说，问题是我的PATH环境变量中有两个条目，它指向包含javaw可执行文件的位置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925576|我清理了变量，以确保"%25JAVA_HOME%25\bin“是引用包含java可执行文件的位置的唯一条目。|925577|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|$]]

Incase it helps, the problem for me was that I had 2 entries in my PATH environment variable which pointed to a location containing the javaw executable.

I cleaned up the variable to make sure that "%JAVA_HOME%\bin" was the only entry referencing a location containing my java executables.

blocks|key|925584|text|Step1检查您的jdk是否已安装。并设置变量路径。Step2卸载你的eclipes并重新安装它。否则，它将继续成为一个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|925585|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|$]]

Step1 Check your jdk is installed. and variable path is setted.
Step2 unistall your eclipes and reinstall it. other wise It will continue to be a problem

blocks|key|709342|text|值得注意的是，从Java9.jdk中删除了tools.jar。https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-055EA9F4-835E-463F-B9E1-9081B3D9E55D|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|709343|如果人们在使用JDK+9%2B编译Java程序时遇到这个问题，您可能需要检查项目的依赖关系。|709344|在我的例子中，我试图使用AspectJ和Maven+org.codehaus.mojo:aspectj-maven-plugin:1.11编译一个项目。在网上搜索后，我找到了一个支持Java+9%2B的替代方案：dev.aspectj:aspectj-maven-plugin:1.13.M3。|style|CODE|709345|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-055EA9F4-835E-463F-B9E1-9081B3D9E55D^0|V|2O|0|0|0|Q|17|2W|14|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|W|8|@$A|X|B|Y|H|I]|$A|Z|B|10|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

It's worth observing that tools.jar has been removed from the JDK since Java 9. <a href="https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-055EA9F4-835E-463F-B9E1-9081B3D9E55D" rel="nofollow noreferrer">https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-055EA9F4-835E-463F-B9E1-9081B3D9E55D</a>
If people are facing this issue compiling a Java program with JDK 9+, you may need to review the dependencies of your projects.
In my case, I was trying to compile a project using AspectJ and the Maven plugin <code>org.codehaus.mojo:aspectj-maven-plugin:1.11</code>. After searching online, I found an alternative that supports Java 9+: <code>dev.aspectj:aspectj-maven-plugin:1.13.M3</code>.

I am building a project in Java. 

I have this error:

<pre class="lang-none prettyprint-override"><code>Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
</code></pre>

I have installed a JDK and the folder: <code>C:\Program Files\Java\jre6\lib</code> is in my system but the file <code>tools.jar</code> is not there.

Unable to locate tools.jar

Ubuntu

Linux

Java

我正在用Java构建一个项目。我有这个错误：Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar我已经安装了一个JDK，文件夹：C:\Program Files\Java\jre6\lib在我的系统中，但是文件tools.jar不在那里。

问找不到tools.jar
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