jacob运行tomcat报错 Could not initialize class com.jacob.com.ComThread

Posted 2023-05-06

参考技术A 不能初始化com.jacob.com.ComThread这个类，是不是dll文件放错地方了，多试两下。实在不行，更换服务器 参考技术B

jacob-1.18.zip

tomcat启动报错BaseExecutor:getDatabaseId:55 - Could not get a databaseId from dataSource

项目换mysql8后，使用了新的jdbc和c3p0包。

idea中直接将相应的包添加到项目的lib文件夹并删除旧版本，

启动tomcat后类似如下错误：

[RMI TCP Connection(3)-127.0.0.1]2019-03-07 23:04:05,338 [ERROR]  BaseExecutor:getDatabaseId:55 - Could not get a databaseId from dataSource
java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:690)

解决方案:

到tomcat的webapps目录下，删除整个应用项目后重新启动项目  正常