Can multiple Spring configurations be used in a single application?

Yes, it is possible to use multiple Spring configurations within a single application. This is often done to separate settings by functional modules, environments (e.g., dev, prod), or different application contexts.

In Spring, you can create multiple configuration classes annotated with @Configuration and load them together:

@Configuration
public class DataSourceConfig {
    // data source settings
}

@Configuration
public class SecurityConfig {
    // security settings
}

At application startup, you can specify which configurations to load, for example, via @Import or in XML configuration.

Spring also supports Profiles, which allow activating different configurations depending on the environment:

@Configuration
@Profile("dev")
public class DevConfig {
    // development settings
}

@Configuration
@Profile("prod")
public class ProdConfig {
    // production settings
}

Thus, Spring provides flexible mechanisms to work with multiple configurations within a single application.