Perhaps JAVA_HOME does not point to the JDK

在Linux6.4环境下，配置JavaEE的发布环境，JDK、Tomcat安装完成后，启动Tomcat，访问应用，报出如下错误：

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 "/usr/jdk1.6.0_45/jre"

在网上找了不少方法，最终成功的方法如下：

把$JAVA_HOME/lib/tools.jar复制到TOMCAT_HOME/lib下，重启动Tomcat，就可以解决了