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Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"
<Resource auth="Container" driverClassName="core.log.jdbc.driver.MysqlDriver" maxActive="50" name="jdbc/enview" password="pw" type="javax.sql.DataSource" url="url" username="username"/>maxActive = "20" 에서 50으로 변경
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