/bin/java: No such file or directory

This answer is applicable for Hadoop version 2.6.0 and earlier. Disabling SIP and creating a symbolic link does provide a workaround. A better solution is to fix the hadoop-config.sh so it picks up your JAVA_HOME correctly

In HADOOP_HOME/libexec/hadoop-config.sh look for the if condition below # Attempt to set JAVA_HOME if it is not set

Remove extra parentheses in the export JAVA_HOME lines as below. Change this

if [ -x /usr/libexec/java_home ]; then
    export JAVA_HOME=($(/usr/libexec/java_home))
else
    export JAVA_HOME=(/Library/Java/Home)
fi

to

if [ -x /usr/libexec/java_home ]; then
    // note that the extra parentheses are removed
    export JAVA_HOME=$(/usr/libexec/java_home)
else
    export JAVA_HOME=/Library/Java/Home
fi

Restart yarn after you have made this change.

More detailed info can be found here https://issues.apache.org/jira/browse/HADOOP-8717 and seems that Hadoop 3.0.0-alpha1 is the first release with the fix.

方法二

试了以上几种方法后依然无法解决问题，然后在链接4的评论下又看到一篇文章，说能真正解决这个问题，因为以前遇到过这个问题，依稀记得当时是重启电脑输入什么命令后解决的，然后点进去链接看到文章里果然有我的评论，所以在此仅以此文记录下这个坑，以后再犯好找解决方法

以下是解决方法，参考这里： 
1，重启电脑，进入恢复模式，打开终端 
2，输入以下命令，禁用SIP特性，SIP特性大概是指即使拥有sudo权限也无法修改系统级目录的权限，默认为启用状态

csrutil disable
1
3，重启电脑，进入正常模式，打开终端 
在输入建立java软连接的命令

sudo ln -s /usr/bin/java /bin/java
1
输入系统密码就OK了，到此，此错误成功解决

后续：由于担心disable了csrutil会对系统本身有什么影响，于是打算再次开启，测试流程如下 
先重启电脑，再运行job，第一次失败，提示什么safe mode，第二次成功 
再重启电脑，进入恢复模式，启用csrutil

csrutil enable
1
successfully enabled system integrity protection,please restart the machine for the change to take effect 
1
再重启电脑，再运行job，第一次失败，提示什么safe mode，第二次成功 
至此，得出hadoop环境已经正常。