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QUESTION:SSM：出现Connections could not be acquired from the underlying database异常的解决 ...
本是古典 何须时尚相关 MySQLNonTransientConnectionException: Could not create connection to database server.
问题描述 SPringBoot项目后断使用MYSQL 5.7.43。Java JDBC驱动依赖选择的是 <groupId>mysql</groupId>
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报错信息 log4j:WARN No appenders could be found for logger (org.springframework.core.en
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先放异常信息： org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation;
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/Library/Java/JavaVirtualMachines/jdk1.8.0\_74.jdk/Contents/Home/bin/java -ea -Didea.lau
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使用C3P0访问数据库的时候会出现这样的异常，大部分情况下是因为c3p0-config.xml里面有错误。基本是因为properties元素后面内容没有全部小写。基
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