Eclipse使用Ant编译时报错Perhaps JAVA_HOME does not point to the JDK

Ant编译时报错，内容如下： 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:\Java_Tools\Java\jre7" 解决，需要指定Eclipse编译时JREs，根据提示，应指定到JDK 如下图，点击

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