blocks|key|53787|text|我也遇到了同样的问题，问题是，在eclipse中，java.home使用的是JRE而不是JDK。我更改了它，构建成功了。您可以执行以下操作将其更改为JDK：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53788|首选项>+Java+>已安装的JRE>添加...对于'JRE+Type‘，选择'Standard+VM’>+Next+>+Directory:选择您的JDK目录(而不是JRE)+(在我的例子中:+C:\Program+Files\Java\jdk1.6.0_16+)，按OK。|53789|现在，你回到“已安装的JRE”，在这里也选择JDK。|53790|下面的帖子有助于找到解决方案。JAVA_HOME+points+to+the+wrong+place|offset|length|53791|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1951083/java-home-points-to-the-wrong-place^0|0|0|0|F|Z|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

I had the same problem and the issue was, in eclipse java.home was referring to JRE instead of JDK. I changed it and the build was successful. You can do the following to change it to JDK:

Preferences > Java > Installed JRE's > Add... For 'JRE Type' select 'Standard VM' > Next > Directory: select your JDK directory (instead of JRE) (in my case: C:\Program Files\Java\jdk1.6.0_16 ), press OK.

Now, you are back at 'Installed JRE's', select the JDK here also.

The below post helped in finding the solution.
<a href="https://stackoverflow.com/questions/1951083/java-home-points-to-the-wrong-place">JAVA_HOME points to the wrong place</a>

blocks|key|2747139|text|如果上面接受的答案不能解决问题(就像我不能解决的那样)，在将java.home更新为JDK而不是上面接受的答案中建议的JRE之后，转到Run+->+External+Tools+->+External+Tools+Configuration+->在左侧菜单中选择您的build.xml+->选择JRE选项卡->选择JDK(从下拉列表中)对于单独的JRE单选按钮选项->单击Run。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2747140|这应该可以解决这个问题。|2747141|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|$]]

If the accepted answer above doesn't solve the problem for you (as it didn't for me), after updating the java.home to JDK instead of JRE as suggested in the accepted answer above, Go to Run -> External Tools -> External Tools Configuration -> select your build.xml on the left menu -> select JRE tab -> select the JDK(from the dropdown) for Separate JRE radio button option -> Click Run.

This should fix the problem.

blocks|key|52797|text|我遇到了同样的问题，并从javac中删除了属性fork，问题就消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52798|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 had the same problem and removed the attribute fork from javac and problem was gone.

blocks|key|2746992|text|也许javac.exe的问题是因为您的系统路径中没有“JDK”，请编辑您的系统路径，并将您的JDK的/bin目录添加到其中以纠正此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2746993|打开shell或命令提示符，尝试输入:+javac以检查系统路径是否设置正确。|2746994|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|$]]

Maybe the javac problem is because "javac.exe" is not in your System PATH, please edit your system path and add your JDK's /bin directory to it to correct this problem. 

Open a shell or command prompt and try typing: javac to check if the system path is set correctly.

blocks|key|2537184|text|将eclipse配置为指向JDK而不是JRE对我来说不起作用。经过进一步的研究，我通过停止forking的构建过程解决了这个问题。在build.xml中，从<javac>标记中删除属性fork。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2537185|entityMap^0|26|7|2K|4|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Configuring eclipse to point to JDK instead of JRE did not work for me. 
With further investigation, I solved this problem by stopping the build process from forking.
In your build.xml, remove the attribute <code>fork</code> from <code>&lt;javac&gt;</code> tag.

blocks|key|52398|text|我也遇到了同样的问题，这是我的建议，也许它会对某些人有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52399|实际上，message+Error+running+javac.exe+compiler表示出了问题。问题是，到底是什么。当Ant使用fork="true"标志运行javac任务时，它不会打印任何错误详细信息。在我的例子中，即使在我按照建议的here添加了verbose="true"之后，它也没有打印它们。解决方案是在Ant命令行中添加-verbose标志|offset|length|style|CODE|BOLD|52400|ant+-verbose|code-block|syntax|javascript|52401|在此之后，Ant开始打印完整的错误消息，因此您可以修复问题。|52402|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/17492022/how-to-see-the-compiler-output-when-running-javac-through-an-ant-task^0|0|C|W|1V|B|2A|5|3K|E|4P|8|3D|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@$D|Z|E|10|F|G]|$D|11|E|12|F|G]|$D|13|E|14|F|G]|$D|15|E|16|F|G]|$D|17|E|18|F|H]]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|I|3|J|5|K|7|1C|8|@]|9|@]|A|$L|M]]|$1|N|3|O|5|6|7|1D|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W]]]]

I faced the same problem, and here is my advice, maybe it will help someone. 
In fact, message <code>Error running javac.exe compiler</code> means that something went wrong. The question is, what exactly. When Ant runs <code>javac</code> task with <code>fork="true"</code> flag, it doesn't print any error details. In my case, it didn't print them even after I added <code>verbose="true"</code>, as suggested <a href="https://stackoverflow.com/questions/17492022/how-to-see-the-compiler-output-when-running-javac-through-an-ant-task">here</a>. Solution was to add -verbose flag to Ant command line:

<pre><code>ant -verbose
</code></pre>

After this, Ant starts printing full error messages, so you are able to fix a problem.

blocks|key|2537300|text|我通过在我的Windows7中检查我的环境变量解决了这个问题。我发现JAVA_HOME指向C:\+程序文件(x86)\Java\jdk1.6.0_31，而它应该是C:\+Program+Files\Java\jdk1.6.0_31。如果您想知道read+this是如何|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2537301|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/9673871/setting-up-environment-variables-in-windows-7-for-java-and-ant^0|Y|9|1D|9|2D|D|3E|9|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

I solved this by checking my Environment Variables in my Windows 7. I found that JAVA_HOME is pointing to C:\ Program Files (x86)\Java\jdk1.6.0_31 when it supposed be C:\ Program Files\Java\jdk1.6.0_31. If you want to know how <a href="https://stackoverflow.com/questions/9673871/setting-up-environment-variables-in-windows-7-for-java-and-ant">read this</a>

blocks|key|2747324|text|如果您在eclipse中运行ant，请单击run+->+Ant+second+option并选择JDK+path，然后再次运行构建。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2747325|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 are running ant in eclipse click run as --> Ant second option and choose JDK path and run the build again.

blocks|key|52750|text|尝试将memorymaximumsize="1G“更改为memorymaximumsize="512M”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52751|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|$]]

Try changing memorymaximumsize="1G" to memorymaximumsize="512M".

blocks|key|52895|text|尝试释放一些主内存。关闭耗用内存的程序，并尽可能停止耗用内存的进程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52896|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|$]]

Try to free some main memory. Close memory-hungry programs, and stop memory-hungry processes if you can.

blocks|key|53877|text|我已经尝试了所有的方法，但是都没有对我起作用，直到我设置了(在你的例子中fork=‘no’+or+fork='false‘)并且对我完美起作用|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|53878|entityMap^0|10|9|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've tried everything but nothing worked for me till I've set (fork='no' or fork='false' in your case) and worked for me perfectly

blocks|key|53886|text|我去掉了fork="true“，并跳过了这段代码。对于那些有这个问题的人来说，有趣的是，现在，在这一行，我得到了输出：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|53887|'Since+fork+is+false,+ignoring+memoryMaximumSize+setting.'|code-block|syntax|javascript|53888|因此，如果您需要如上所述保持您的fork="true“设置，这可能是memoryMaximumSize的一个问题。|53889|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|$]]

I removed fork="true" and I got past that piece of code. What might be interesting to those of you who have this problem is that now, at that line, I get the output:

<pre><code>'Since fork is false, ignoring memoryMaximumSize setting.'
</code></pre>

So it may be an issue with memoryMaximumSize if you need to keep your fork="true" setting, as suggested above.

blocks|key|2747288|text|我像这样解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2747289|我的Java主文件夹路径错误。它应该是C:\Program+Files+(x86)\Java\jdk1.5.0_15，但它却是C:\Program+Files+(x86)\Java\jdk1.5.0_15\bin。|offset|length|style|CODE|2747290|entityMap^0|0|J|13|1R|17|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|I|$]]

I fixed the problem like this:

My Java home folder had the wrong path. It should have been <code>C:\Program Files (x86)\Java\jdk1.5.0_15</code> but instead it was <code>C:\Program Files (x86)\Java\jdk1.5.0_15\bin</code>.

blocks|key|2537400|text|我们在windows构建机器上遇到了同样的问题，而在本地(在unix机器上)一切都解决了。Fork+=+true也没有帮助，它只在构建服务器上导致进程fork失败异常|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2537401|研究|offset|length|style|BOLD|2537402|经过一些研究，我们有了一个线索，即类路径可能太长。我们在windows机器上本地重新创建了确切的文件夹结构，我们遇到了同样的问题，我们发现类路径太长了(我们使用-v和-d来详细说明它有多长)，这就是错误的原因。|2537403|解决方案|2537404|解决方案是创建一个jar，它只包含所有库的清单，更多详细信息请参见this+answer|2537405|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/201969^0|0|0|2|0|0|0|4|0|X|B|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@$D|X|E|Y|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@$D|11|E|12|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|N|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

We hit the same issue on a windows build machine whereas locally (on a unix machine) everything worked out. Fork = true didnt helped either, it resulted in a Process fork failed exception also only on the build server

Research

After some research, we had a clue that the classpath might be too long.
We recreated the exact folder structure locally on a windows machine and we hit the same issue and we saw that the classpath was way too long (we used -v and -d for details how long it was) and this was the cause of the error.

Solution

The solution was to create a jar, which contains only the manifest with all the libraries, see <a href="https://stackoverflow.com/a/201969">this answer</a> for more details

blocks|key|2537455|text|对我来说，它是WEB-INF/lib目录中的备份libs。我在主库中有多个库目录。并且类路径中包含了它们，导致javac命令变得太长。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2537456|我删除了这些目录，这对我来说很有效。|2537457|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 it was backup libs inside WEB-INF/lib directory. 
I had multiple lib directory inside the main lib. And the classpath was including them all causing the javac command to become too long.

I removed those directories and it worked for me.

blocks|key|2537482|text|这是一个非常简单的问题。基本目录路径指向许多子文件夹，这些子文件夹指向实际的文件夹。例如:+/folder1/folder2/.../.../folderN/{project}|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2537483|减小基本目录路径大小，它将很容易编译。例如:+D:/{project}|2537484|以后再谢谢我吧。|2537485|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|$]]

That's a very simple issue. The base directory path has to many subfolders that leads to the actual folder. For e.g.:
/folder1/folder2/.../.../folderN/{project}
Decrease the base directory path size and it will compile easily.
For e.g.:
D:/{project}
Thank me later.

blocks|key|52884|text|大多数情况下，项目文件夹的长路径会导致构建失败。即使在从命令行运行时，也总是会发现这一点。只需将路径缩短为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|52885|{驱动器号}/{签出项目文件夹}|offset|length|style|BOLD|52886|ant命令肯定会编译java+JDK。|52887|entityMap^0|0|0|G|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Most of the times, long path to project folder makes the build fail. That's what was found always even when running from Command Line. Just shorten your path to:
{Drive Letter}/{Checkout Project Folder}
and ant commands will surely compile the java JDK.

When I run my Ant build in Eclipse, I'm getting the following error message and the Ant build fails.

Error Message: Error running javac.exe compiler

Line where the build stops:

<pre><code>&lt;javac destdir="${classes.home}" debug="on" fork="true" memoryinitialsize="512M" memorymaximumsize="1G"&gt;
 &lt;classpath refid="classpath"/&gt;
 &lt;src path="${source.home}"/&gt;
&lt;/javac&gt;
</code></pre>

Has anyone faced a similar problem before? or does anybody know what's wrong here?

System Information: Eclipse Helio, JDK 1.5

Getting Error running javac.exe compiler message, while using Ant in Eclipse

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当我在Eclipse中运行Ant构建时，我得到以下错误消息，Ant构建失败。错误消息:运行javac.exe编译器时出现错误构建停止的行：<javac destdir="${classes.home}" debug="on" fork="true" memoryinitialsize="512M" memorymaximumsize="1G"> <classpath refid="c

问在Eclipse中使用javac.exe时，运行Ant编译器时出现错误消息
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