Database may be already in use: null. Possible solutions: close all other connection(s);
错误信息如下:Database may be already in use: null. Possible solutions: close all other connection(s); use the server mode[90020-199]

解决方法:
第一步:点击关闭运行H2数据库
Database may be already in use: null. Possible solutions: close all other connection(s);
第二步:重新启动本程序
Database may be already in use: null. Possible solutions: close all other connection(s);

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