build.xml:278: Unable to find a javac compiler;

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#ant #compiler #openfire #Add External JARs #tools.jar

本文介绍了解决使用Ant编译Openfire时遇到的javac编译器未找到的问题。详细步骤包括下载并安装JDK，配置环境变量JAVA_HOME、CLASSPATH及Path，以及在Eclipse中添加JDK的tools.jar文件。

使用Ant编译openfire出现问题:

build.xml:278: 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 "C:\Program Files\Java\jre7"
解决:

一.下载jdk,地址http://wh.uzzf.com//jxl/jdk-windows-32_setup.zip

二.配置jdk环境

1.右键选择 计算机→属性→高级系统设置→高级→环境变量

2.系统变量→新建

变量名：JAVA_HOME

变量值：（变量值填写你的jdk的安装目录，例如本人是 E:\Program Files\Java\jdk1.7.0_45）

3.在系统变量中找到 Path 变量，选择编辑

在变量值最后输入 %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;

（注意如果原来Path的变量值末尾没有;号，就先输入;号再输入上面的代码）

4.系统变量→新建

变量名：CLASSPATH

变量值：.%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar（注意最前面有一点）

到这系统变量就配置完毕了。

5.检验jdk是否配置成功：运行cmd 输入 java -version （java 和 -version 之间有空格）

三.在eclipse中配置

windows->preferences->ant-> Runtime->Classpath->Ant Home Entries->Add External JARs,添加了jdk下面的/lib/tools.jar后，编译通过
参考:http://www.uzzf.com/soft/395.html

http://hi.baidu.com/queryworld/item/40b1ddedce7da4fd2b09a440

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