Netbeans出错Unable to locate the Javac Compiler in:C:\JDK\..\lib\tools.jar
DOS中运行javac 没有问题，用Netbeans构建出错：
COMPILATION ERROR :
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Unable to locate the Javac Compiler in:
C:\JDK\..\lib\tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.
1 error
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BUILD FAILURE
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Total time: 1.354s
Finished at: Fri Apr 03 22:06:30 CST 2015
Final Memory: 6M/109M
环境变量已添加：
JAVA_HOME C:\JDK
PATH %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;
CLASSPATH %JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;
到底哪里出错 求解！~！！！
