Support Spring Boot 3.4

[toco-cam]

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Is planned to be released November 21, 2024.

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1. chore(pom): add support for Spring Boot 3.4.0 #4800
   bot:backport:7.22 bot:java-dependency-check ci:all-as ci:e2e ci:run ci:spring-boot +6
   
2. chore(spring-boot): add support for Spring Boot 3.4.0 camunda-docs-manual#1720
   +0
   
3. chore(spring-boot): add support for Spring Boot 3.4.0 camunda-docs-manual#1719
   +0
   
4. https://github.com/camunda/camunda-bpm-platform-maintenance/pull/1336

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[mboskamp]

FYI 3.4.0-RC1 was released

[tasso94]

This might be related #4753

[mboskamp]

Findings

Spring Boot 3.4.0 release notes

The official release notes are published here.

RestClient and RestTemplate

We use the RestTemplate for testing in Camunda Run. The changes highlighted in the release notes impact how redirects are handled. Without any further configuration, the underlying HttpClient will follow redirects from HTTP to HTTPS. This broke one test that tests HTTP(S) configurations in Camunda Run. spring.http.client.factory: simple needs to be configured for the RestTemplate to behave as before 3.4.0.

Another change in the RestTemplate's underlying HttpClient caused a different error message to be returned when sending an HTTP request to an HTTPS endpoint for Camunda Run. The error message needed to be updated in the test. The new error message is backward compatible (works as well for Spring Boot 3.3.x).

Removal of deprecations

Spring Boot 3.4.0 removes classes marked as deprecated in 3.3.x (source). This had no effect on our code.

Startup issues

The httpclient5 had to be updated to the version specified for Spring Boot 3.4.0. Otherwise, the Spring Boot Starter would not start.

[mboskamp]

I reverted the commit to master (69958d3) due to test failures.

[2024-12-10T12:18:36.924Z] [ERROR] testHttpBasicAuthenticationCheck[0](org.camunda.bpm.engine.rest.standalone.AuthenticationFilterPathMatchingTest)  Time elapsed: 0.032 s  <<< ERROR!

[2024-12-10T12:18:36.925Z] java.lang.NoClassDefFoundError: org/springframework/http/MediaType

[2024-12-10T12:18:36.925Z] 	at org.camunda.bpm.engine.rest.standalone.AuthenticationFilterPathMatchingTest.testHttpBasicAuthenticationCheck(AuthenticationFilterPathMatchingTest.java:200)

[2024-12-10T12:18:36.925Z] Caused by: java.lang.ClassNotFoundException: org.springframework.http.MediaType

[2024-12-10T12:18:36.925Z] 	at org.camunda.bpm.engine.rest.standalone.AuthenticationFilterPathMatchingTest.testHttpBasicAuthenticationCheck(AuthenticationFilterPathMatchingTest.java:200)