Native agent adds 10x startup time to Spring Boot app

I added a sample project to reproduce it at https://github.com/phillipuniverse/rollbar-native-test. Without the agent, startup time is ~2s. With the agent, startup time is ~20s. The project uses the .dylib and .so files that I used to validate with, both with the same results (although Linux was slightly faster). I build the .dylib and .so files from the master branch just to make sure I had all the changes.

In this example it isn't so bad, but it takes a different Spring Boot project (that has Spring Data, Rabbit, Mongo, JPA, etc etc) go from ~15s startup time to ~400s which makes the whole native agent a non-starter.

I will say though, once it starts up I get locals in my Rollbar traces which is why I would really like this to work!!

Might be relevant, but when I turn on debug logging with ROLLBAR_LOG=debug I get this:

 INFO  rollbar_java_agent > Agent load begin
 INFO  rollbar_java_agent > Agent load complete success
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
 DEBUG rollbar_java_agent > JNI call failed: 'com/rollbar/jvmti/ThrowableCache class not found: com/rollbar/jvmti/ThrowableCache'
...
...

The ThrowableCache class not found is emitted an insane amount of times. If I were to bet, it seems to indicate that the cache is not being used by the native agent, which contributes to the super slow startup times??

Start by running the sample project at https://github.com/phillipuniverse/rollbar-native-test with and without the .dylib and .so agents, recording startup times. Enable ROLLBAR_LOG=debug and investigate the repeated ThrowableCache class-not-found messages. Done means the agent no longer causes the reported startup slowdown and the repeated debug failures are resolved or explained.