Ant“JAVA_HOME不指向JDK” - 但确实如此 [英] Ant "JAVA_HOME does not point to the JDK" - but it does

问题描述

我无法运行我的Ant build.xml，因为我更新到java 1.7.0_52（或那里）。我已经在我的Windows 7笔记本电脑上通过Eclipse本地运行了多年 - 但是这个最新的jave jdk更新了一些不同的东西（？）。

I cannot run my Ant build.xml since I updated to java 1.7.0_52 (or there about). I have been running it for years through Eclipse locally on my Windows 7 laptop - but with this latest jave jdk update somethings different (?).

BUILD FAILED
C:\workspace\WaterAspectsModel3\build.xml:329: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "D:\Morten\Java\jdk1.7.0_52"

这是我的jdk！所以JAVA_HOME指向一个jdk（从错误消息中也可以看出）。我一直在路径中使用带有bin文件夹的JAVA_HOME。我已经配置了Eclipse - 外部工具配置 - JRE指向相同的D：\ Morten \ Java \ _ddk1.7.0_52（通过Separate JRE设置）。我已经尝试了许多其他配置 - 都没有运气。

This is my jdk! So JAVA_HOME is pointing to a jdk (as is also clear from the error message). I have my JAVA_HOME with bin folder in my path as always. I've configured Eclipse - external tools configuration - with a JRE pointing to the same D:\Morten\Java\jdk1.7.0_52 (through "Separate JRE" setting). And I've tried a number of other configurations - all without luck.

我一直在阅读这里和其他地方的列表中的吨数答案，并认为我已经尝试了所有建议。大多数情况似乎是JAVA_HOME实际上指向jre的情况，只需要纠正为jdk或者有一个;在路径或类似的东西。这些似乎都不适用于我的情况。

I've been reading the tonnes of answers on lists here and other places and think I've tried all suggestions. Most seem to be cases where JAVA_HOME actually points to a jre and just needs to be corrected to jdk or there's a ";" in the path or something like that. None of these seem to apply in my case.

有任何建议吗？

推荐答案

真正的信息是Ant无法找到 com.sun.tools.javac.Main 。

The real message is that Ant can't find com.sun.tools.javac.Main.

其中，以及最新的Sun（Oracle）JDK是1.7.0_13（或者可能是_14，但绝对不是你的安装目录所指的_52）的事实，让我觉得你没有使用Ant认可的分布。您可以通过运行 jar tvf $ JAVA_HOME / lib / tools.jar 来验证这一点，并查找该类。

Which, together with the fact that the latest "Sun" (Oracle) JDK is 1.7.0_13 (or maybe _14, but definitely not the "_52" that your install dir indicates), makes me think that you're not using a distribution that Ant recognizes. You can verify this by running jar tvf $JAVA_HOME/lib/tools.jar, and looking for that class.

Ant手册讨论了使用不同编译器的方法。由于我只使用Sun编译器，我担心我无法给你任何指示。

The Ant Manual talks about ways to work with different compilers. Since I've only used "Sun" compilers, I'm afraid that I can't give you any pointers.

编辑：您还可以尝试在构建文件中设置 fork =yes。这应该运行编译器可执行文件而不是尝试调用编译器类。

you could also try setting fork="yes" in your build file. This should run the compiler executable rather than trying to invoke the compiler class.

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