从网上下载下来的web工程运行时提示这个错误求问怎么处理

The server encountered an internal error () that prevented it from fulfilling this request. javax.servlet.ServletException: org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Cannot create PoolableConnectionFactory (Communications link failure due to underlying exception:

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从网上下载下来的web工程 运行时提示这个错误 求问怎么处理

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从网上下载下来的web工程运行时提示这个错误求问怎么处理