1. Accelerating Development
with Organizational Opinions
October 7–10, 2019
Austin Convention Center

2. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
MUST CODE
FASTER!

3. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
LESS CODE

4. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
What are Organizational Opinions?
Spring Boot is “Opinionated”
• Investigates its environment (configuration, libraries, etc.)
• Instantiates beans and executes logic to establish default behavior
• Delivered through Spring Boot autoconfiguration
Organizational Opinions
• Implementation of standards through autoconfiguration
• Security, Operations, etc.
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5. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Goal: Keep developers focused on…
Business Functionality

6. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
We get to enjoy…
• Predictability
• Typical behavior by default
• Consistency
• Easy for them to do the right thing
• Manage the 20%
• Supportability
• Operations out-of-the-box
• Sleep

7. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Developer Experience
What should be the Developer Experience?
• Should they have any choice?
How do they communicate intended behavior?
• Declared through an annotation?
• Bean construction?
How can they customize behavior?
• Configuration properties?
• Bean construction?
What about Operations?
• Should it include a HealthCheck bean?
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8. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Opinion Ownership
Opinions come in many forms…
Enterprise-wide
• Logging, Tracing
Technology-specific
• Configuration, Platform Security
Departmental
• Application-nuanced, layered on Enterprise/Technology
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9. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Lets Pair On an Example!

10. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Developer Experience – Acceptance Criteria
• RestTemplate Beans should be configured to log all outbound requests when
Bean is annotated with “@RequestLogging”
• Request logging should be enabled by default and should be disabled by
setting the property “request.logging.enabled=false”
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11. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Developer Experience
@Configuration
public class ExampleApplicationConfiguration {
@Bean
@RequestLogging
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
@Qualifier
public @interface RequestLogging {}

12. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Option 1 - BeanPostProcessor
@Configuration
public class RequestLoggingConfiguration {
public BeanPostProcessor postProcessor() {
return new BeanPostProcessor() {
@Override
public Object postProcessAfterInitialization(Object bean, String beanName)
throws BeansException {
if (bean instanceof RestTemplate) {
...
}
return bean;
}
};
}
}

13. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Option 2 - SmartInitializingSingleton
@Configuration
public class RequestLoggingConfiguration {
@Autowired(required = false)
@RequestLogging
private List<RestTemplate> restTemplates;
@Bean
public SmartInitializingSingleton requestLoggingRestTemplateInitializer() {
return () -> this.restTemplate.forEach(restTemplate -> {…});
}
}

14. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
WE ARE DONE!

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Oh No!

16. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Developer Experience – Acceptance Criteria
• Request logging should be enabled by default and should be disabled by
setting the property `request.logging.enabled=false`
1
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Option 1 - @Enable* Annotation
@Configuration
@EnableRequestLogging
public class ExampleApplicationConfiguration {
}
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@Import(RequestLoggingConfiguration.class)
public @interface EnableRequestLogging {
}

18. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Option 2 – spring.factories
META-INF/spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=
com.acme.RequestLoggingAutoConfiguration
@Configuration
public class RequestLoggingAutoConfiguration {
…
}
1
8

19. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Option 2+ – conditional spring.factories
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META-INF/spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=
com.acme.RequestLoggingAutoConfiguration
@Configuration
@ConditionalOnProperty(name=“request.logging.enabled”, havingValue=“true”)
public class RequestLoggingAutoConfiguration {
…
}

20. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Testing
@Test
public void betterTestMethodNameHere() {
new ApplicationContextRunner()
.withUserConfiguration(RequestLoggingAutoConfiguration.class)
.withPropertyValues(”request.logging.enabled=false")
.run(context -> {
assertThat(context).doesNotHaveBean("initializingSingleton");
});
}

21. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
WE ARE FINALLY DONE!

22. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Recap
@Configuration
@ConditionalOnProperty(name=“request.logging.enabled”, havingValue=“true”)
public class RequestLoggingAutoConfiguration {
@Autowired(required = false)
@RequestLogging
private List<RestTemplate> restTemplates;
@Bean
public SmartInitializingSingleton requestLoggingRestTemplateInitializer() {
return () -> this.restTemplate.forEach(restTemplate -> {…});
}
}
META-INF/spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=
com.acme.RequestLoggingAutoConfiguration

23. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Recommendations
- Configuration Processor Library
- org.springframework.boot:spring-boot-configuration-processor
- Configuration Property IDE Hints
- Autoconfiguration Processor Library
- org.springframework.boot:spring-boot-autoconfigure-processor
- Indexes Auto-Configurations for Faster Application Start Times

24. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Additional Configuration Points
- EnvironmentPostProcessor
- Load Additional Property Sources
- ApplicationListeners
- Make changes based on application events
- ConfigurationPropertyBindingPostProcessor
- Makes changes to any @ConfigurationProperty Beans
- SecurityConfigurer
- Allows for Customizing Spring Security Configuration

25. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Additional Autoconfiguration Conditionals
- @Conditional
- @ConditionalOnBean
- @ConditionalOnMissingBean
- @ConditionalOnResource
- @ConditionalOnClass
- @ConditionalOnMissingClass
- @ConditionalOnCloudPlatform
- @ConditionalOnWebApplication
- @ConditionalOnExpression

26. Unless otherwise indicated, these slides are © 2013-2019 Pivotal Software, Inc. and licensed under a Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
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