In the classic web.xml type configuration you could configure context parameters like so
web.xml
...
p-nam
Also you can define InitParameterConfiguringServletContextInitializer in your configuration. Example:
@Bean
public InitParameterConfiguringServletContextInitializer initParamsInitializer() {
Map contextParams = new HashMap<>();
contextParams.put("p-name", "-value");
return new InitParameterConfiguringServletContextInitializer(contextParams);
}