J2SE - Could not find the main class: xxx.xxx.Program will exit
問題
在Windows下，直接執行jar檔案時，無法執行並報錯
Could not find the main class: xxx.xxx.Program will exit
但在命令列下通過 java -jar jar_name.jar 命令可以執行
方案
系統開始裝的是Jdk1.8，後開發需要裝過Jdk1.6，但環境變數還是1.8的
修改登錄檔
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\jarfile\shell\open\command
編輯或修改名稱為預設的鍵值對的值為對應版本的javaw.exe
"C:\Develop\Jdk-1.8.0\jre\bin\javaw.exe" -jar "%1" %*
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