Speaker Mark Heckler @mkheck

For more, see the table of contents

Notes

• Developers don’t believe in magic
• Most developers are bad at debugging. Or at least not as good as they could be
• We got sloppy when we get used to thinking we know what’s happening
• Important to isolate problem and not just symptoms

Code wakthru

• @SpringBootApplication – meta-annotation. Enables the other scaning annotations
  • @SpringBootConfiguration
  • @EnableAutoConfiguration
  • @ComponentScan
• Starter parent pom has dpendencies that have been tested together. Provided in dependency management so can choose what need
• Proved @Component still creates a @Bean
• SpringApplication.run returns a ConfigurableApplicationContext. We don’t typically use it directly, but can look into it.
• ApplicationRunner (creates prop object from args) vs CommandLineRunner (has args as array). The later is slightly more efficient.
• @Value lets you get a property

Overwriting name

• application.properties with wrong key name. Typo causes code not to use the value
• application.yaml – ignored; still uses application.properties because higher precedence

Actuator

• Can expose a lot of info
• By default, opens two endpoints, status and one other. If want actual info, allow by privilege.
• Can expose everything via management.endpoints.webexposure.include=* (don’t do this in prod)
• loalhost:8080/actuator – see endpoints
• localhost:8080/actuator/env – see java version, list of beans, etc (so can see order)

Remote debugging

• In IDE config, set -agentib:jdwp=transport=dt_socket,server.. (missed the end)

Container

• Can set config in Docker fil.

Key point

You don’t know. You can suspect and hypothesize, but not assume.

My take

I like that Mark showed Spring source code to show what was happening. It took a long time to get to the first thing that went wrong (missing property).. (40 minutes in; another session was already applauding by then). Once he got to that part, I started learning stuff. Mark also seemed rushed for the end and that info went too fast for me. (Combo if it being new and I think he was going faster) Also, the using the audience members as names in the example was fun.