How Can I Enable JDBC Logging with Oracle's Driver and Resolve 'InstanceNotFoundException'?

Enabling Logging for SQL Statements with JDBC

Problem:

You are unable to enable logging for JDBC programs using Oracle's JDBC driver, despite following a previous SO post and implementing the necessary code.

Answer:

The exception you are encountering ("InstanceNotFoundException") indicates that the Oracle diagnostic MBean is not available in your application's classpath. Several issues can cause this, depending on the version of the JDBC driver you are using:

For ojdbc6-11.2.0.3.jar:

This older version of the JDBC driver has known issues with logging. Upgrade to a newer version.

For ojdbc6_g.jar:

This driver version requires a separate JAR file, ojdbc6dms.jar, to enable logging. Add ojdbc6dms.jar to your classpath.

For ojdbc6dms.jar:

This driver version also requires a dependency on oracle/dms/console/DMSConsole. Ensure that this class is available in your application's classpath.

Alternative Solution:

As an alternative to using the Oracle logging mechanism, consider using a logging framework like log4jdbc. It simplifies the process of logging JDBC statements and can be more reliable in certain cases. Here's how to use log4jdbc:

1. Add the log4jdbc JAR to your classpath.
2. Choose a logging system (e.g., log4j, logback) and configure it in your application.
3. Update the JDBC driver class to 'net.sf.log4jdbc.DriverSpy' in your configurations.
4. Prepend 'jdbc:log4' to your JDBC URL.
5. Configure the appropriate logging categories (e.g., 'jdbc.sqlonly' for SQL logging) in your logging system.

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