https://github.com/rburgst/sse-jpa-demo

a demo repository showing problems with JPA and SSE
https://github.com/rburgst/sse-jpa-demo

Last synced: 2 days ago
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a demo repository showing problems with JPA and SSE

• Host: GitHub
• URL: https://github.com/rburgst/sse-jpa-demo
• Owner: rburgst
• Created: 2018-02-19T16:57:10.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2018-02-19T17:05:51.000Z (almost 7 years ago)
• Last Synced: 2024-11-08T17:53:07.121Z (about 2 months ago)
• Language: Java
• Size: 53.7 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
## Sample repository showing a problem with JPA and SSE.

### How To

1. Launch the app

    ```

    ./gradlew bootRun

    ```

2. Launch the browser with http://localhost:8080

3. Open a 2nd window with http://localhost:8080/metrics and keep an eye on `datasource.primary.active`

4. On the 1st browser window press Submit a couple of times, this will cause a page reload and should cause connections

   to get leaked

   

The main problem seems to be `org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor` which keeps the 

JDBC connection open until the SSE socket throws an exception. If we dont try to send any SSEs for a long time

then the connection pool will run out of connections before the first SSE emitter throws an exception and only then gets 

cleaned up.

This repository serves as an example for https://github.com/spring-projects/spring-boot/issues/12110.