mycat啟動失敗，查看日志 /mycat/logs/wrapper.log發現如下信息
1 STATUS | wrapper | 2017/11/22 16:15:17 | --> Wrapper Started as Daemon
2 STATUS | wrapper | 2017/11/22 16:15:17 | Launching a JVM...
3 ERROR | wrapper | 2017/11/22 16:15:17 | Unable to start JVM: No such file or directory (2)
4 ERROR | wrapper | 2017/11/22 16:15:17 | JVM exited while loading the application.
5 STATUS | wrapper | 2017/11/22 16:15:22 | Launching a JVM...
6 ERROR | wrapper | 2017/11/22 16:15:22 | Unable to start JVM: No such file or directory (2)
7 ERROR | wrapper | 2017/11/22 16:15:22 | JVM exited while loading the application.
8 STATUS | wrapper | 2017/11/22 16:15:26 | Launching a JVM...
9 ERROR | wrapper | 2017/11/22 16:15:26 | Unable to start JVM: No such file or directory (2)
10 ERROR | wrapper | 2017/11/22 16:15:26 | JVM exited while loading the application.
11 STATUS | wrapper | 2017/11/22 16:15:30 | Launching a JVM...
12 ERROR | wrapper | 2017/11/22 16:15:30 | Unable to start JVM: No such file or directory (2)
13 ERROR | wrapper | 2017/11/22 16:15:30 | JVM exited while loading the application.
14 STATUS | wrapper | 2017/11/22 16:15:34 | Launching a JVM...
15 ERROR | wrapper | 2017/11/22 16:15:34 | Unable to start JVM: No such file or directory (2)
16 ERROR | wrapper | 2017/11/22 16:15:34 | JVM exited while loading the application.
17 FATAL | wrapper | 2017/11/22 16:15:34 | There were 5 failed launches in a row, each lasting less than 300 seconds. Giving up.
18 FATAL | wrapper | 2017/11/22 16:15:34 | There may be a configuration problem: please check the logs.
19 STATUS | wrapper | 2017/11/22 16:15:34 | <-- Wrapper Stopped
解決方法：
原因可能是JVM參數沒有配置或者配置錯誤
處理方案：
在mycat/conf/wrapper.conf 下增加：
wrapper.java.command=java安裝目錄/bin/java
例如：
wrapper.java.command=/home/hadoop/software/jdk1.8.0_181/bin/java
參考：https://blog.csdn.net/leisure_life/article/details/78612256?locationNum=3&fps=1