Spring Boot - Error creating bean with name 'dataSource' defined in class path resource

The error "Error creating bean with name 'dataSource' defined in class path resource" in Spring Boot typically indicates that there is a problem with the configuration of the dataSource bean.

Here are a few possible causes for this error:

  1. The dataSource bean is defined multiple times in the configuration, which can cause a conflict.
  2. The dataSource bean depends on another bean that is not defined or not initialized properly.
  3. There is a typo in the bean name or the property name in the configuration.
  4. The required dependencies for the dataSource bean are not present on the classpath.

To troubleshoot this error, you can try the following:

  1. Check the configuration file(s) to make sure that the dataSource bean is defined only once.
  2. Make sure that all required dependencies are present on the classpath.
  3. Check for any spelling mistakes or typos in the configuration.
  4. Check for any missing or misconfigured dependencies of the dataSource bean.

If you are using a database connection pooling library such as HikariCP, make sure that the required library is present on the classpath and that the dataSource bean is properly configured.

public DataSource dataSource() {
    HikariDataSource dataSource = new HikariDataSource();
    // set other properties here
    return dataSource;

If you are still unable to resolve the issue, you can try adding debug log statements to the configuration to see what is causing the problem. You can also try starting the application with the --debug flag to enable debug logging.