What does the error message "Connection refused" mean when trying to connect to the local server on port 1527 for a Java web project using JPA/JDBC?

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The error message "Connection refused" means that the connection to the local server on port 1527 was attempted but the server refused to accept the connection. This could be due to a variety of reasons such as the server not running, the port being blocked, or incorrect server configuration. In the context of a Java web project using JPA/JDBC, this error could be caused by incorrect configuration of the database connection settings or the JDBC driver not being properly loaded.