nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. ### The error may exist in URL [jar:file:/usr/local/apache-tomcat-2-7.0.47/olawebapps/ROOT/WEB-INF/lib/yundouservice-1.0.0-SNAPSHOT.jar!/mapper/com/trainforce/dao/mining/LessonMiningDao.xml] ### The error may involve com.trainforce.dao.mining.LessonMiningDao.getLessonMiningBySchoolIdAndLessonId ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

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