Here are a few question-based titles that fit the content of your article: Catchy & Direct: * Oracle JDBC Error: \"IO Error: The Network Adapter Could Not Establish the Connection\" -

Troubleshooting "IO Error: The Network Adapter Could Not Establish the Connection" in Oracle

As a novice in Oracle, encountering this perplexing error while executing code with Java can be disconcerting. This issue arises despite the successful startup of the listener and SQL Plus execution. Here's a comprehensive guide to assist in resolving this problem:

1. Verify Database Connectivity:

   Ensure that the Oracle database is running. If not, start it and reconnect to establish a connection.

2. Check Connection URL:

   Review the JDBC URL you are using to connect to the database. Ensure that the hostname, port, and database name are correct. A mismatch in any of these parameters can result in connection failures.

3. Inspect Firewall Settings:

   A firewall may be preventing the establishment of a connection between your application and the database. Check if your firewall is allowing connections on the required ports (default port for Oracle is 1521). If necessary, open the necessary ports in your firewall.

4. Analyze Connection Exceptions:

   The cryptic error message provided is specific to Oracle's JDBC driver. It is recommended to disable any custom error handling or logging mechanisms to reveal the underlying ConnectException. The message associated with this exception can provide more context about the connection failure.

By following these steps, you can effectively troubleshoot and resolve the "IO Error: The Network Adapter Could Not Establish the Connection" error.

The above is the detailed content of Here are a few question-based titles that fit the content of your article: Catchy & Direct: * Oracle JDBC Error: \"IO Error: The Network Adapter Could Not Establish the Connection\" -. For more information, please follow other related articles on the PHP Chinese website!