在centos7中使用ant编译zookeeper时报错：
/usr/local/apache-zookeeper-3.5.9/build.xml:328: 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/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64/jre"
经排查，原因为未安装jdk开发环境
解决方法，重装jdk及开发包： 1.卸载已安装的openjdk查看已安装jdk：rpm -qa | grep openjdk
卸载已安装jdk：rpm -qa | grep openjdk | xargs rpm -e --nodeps
查看是否已卸载：
2.重装jdk
安装：yum install java-1.8.0-openjdk
配置环境变量：vim /etc/profile
文件尾追加以下代码：
配置文件生效：source /etc/profile
3.安装jdk开发环境yum install java-1.8.0-openjdk-devel.x86_64
查看安装目录内容如下
