Fix java.lang.ClassNotFoundException: org.springframework.web.servlet.HandlerExceptionResolver in Spring Boot Servlet mode without WebMVC

[adinauer]

📜 Description

When using our Spring Boot integration in servlet mode but without having spring-webmvc as a dependency an exception occurred during startup.

This is caused by the return type of the @Bean declaration already being loaded before the @ConditionalOnClass is checked. To avoid it we wrap the bean definition in another @Configuration class.

The ConditionalOnClass JavaDoc mentions this:

Extra care must be taken when using @ConditionalOnClass on @Bean methods where typically the return type is the target of the condition. Before the condition on the method applies, the JVM will have loaded the class and potentially processed method references which will fail if the class is not present. To handle this scenario, a separate @Configuration class should be used to isolate the condition

💡 Motivation and Context

Fixes #1863

💚 How did you test it?

Manually

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	439.94 ms	517.73 ms	77.80 ms
Size	1.70 MiB	2.28 MiB	592.01 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
99a51e2	405.11 ms	479.65 ms	74.54 ms
baaf637	375.71 ms	441.58 ms	65.87 ms
95a98b5	379.14 ms	420.80 ms	41.66 ms
8ff8fd0	432.77 ms	495.18 ms	62.41 ms
937879e	400.98 ms	482.84 ms	81.86 ms
4e29063	376.38 ms	390.98 ms	14.60 ms
28c9a83	366.20 ms	433.88 ms	67.67 ms
0bd723b	412.52 ms	496.65 ms	84.13 ms
93a76ca	377.96 ms	447.52 ms	69.56 ms
a537f8a	457.14 ms	514.19 ms	57.05 ms

App size

Revision	Plain	With Sentry	Diff
99a51e2	1.72 MiB	2.29 MiB	576.34 KiB
baaf637	1.72 MiB	2.27 MiB	558.42 KiB
95a98b5	1.70 MiB	2.27 MiB	586.31 KiB
8ff8fd0	1.72 MiB	2.27 MiB	558.15 KiB
937879e	1.72 MiB	2.27 MiB	558.42 KiB
4e29063	1.72 MiB	2.29 MiB	578.38 KiB
28c9a83	1.70 MiB	2.28 MiB	592.00 KiB
0bd723b	1.72 MiB	2.29 MiB	578.09 KiB
93a76ca	1.72 MiB	2.29 MiB	576.75 KiB
a537f8a	1.70 MiB	2.27 MiB	584.74 KiB

[lbloder]

LGTM 👍