Скачать или смотреть spring boot api integration debug common issues in 15 minutes

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okay, buckle up! we've got 15 minutes to cram in a crash course on spring boot api integration debugging. we'll focus on common issues, tools, and strategies.

*goal:* learn to diagnose and solve common problems when your spring boot application consumes or exposes apis.

*assumptions:* you have basic familiarity with spring boot, rest apis, and common http status codes.

*i. setting the stage: a simple api example*

let's imagine a simple spring boot application that consumes an external api to get user information. and exposes an api that creates user information.



*ii. common api integration issues & debugging*

1. *network connectivity problems:*

*symptom:* `java.net.connectexception: connection refused`, `java.net.unknownhostexception`. the application can't reach the external api.
*causes:*
*incorrect hostname/ip:* double-check the api endpoint url (e.g., in `userservice`). typo?
*firewall:* the firewall on your machine or the server hosting the api might be blocking the connection.
*proxy:* your application might need to use a proxy server to reach the internet. configure the `webclient` to use a proxy.
*api downtime:* the external api server might be down.
*debugging:*
*ping/traceroute:* use `ping` or `traceroute` from your terminal to check basic network connectivity to the api endpoint. this confirms you can even reach the server.
*`curl` or `postman`:* try making the api request directly using `curl` or postman from the same machine where your application is running. this isolates the problem to your application or the network.
*logs:* spring boot logs might show connection errors. enable debug logging for `org.springframework.web.reactive.function.client` to get more detail. add this to your `application.properties` or `application.yml`: `logging.level.org.springframework.web.reactive.function.client=d ...

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spring boot
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debug common issues
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