Native memory leak observed when using db-scheduler

[alexruf]

Description:
We are using db-scheduler in a Spring Boot application (Java/Kotlin, Gradle). We have observed that the JVM's native memory (non-heap memory) consumption increases steadily over time and is never released, even after scheduled tasks complete. This behavior suggests a possible native memory leak in the library.

Steps to Reproduce:

1. Integrate db-scheduler as per documentation.
2. Start the application and schedule recurring tasks.
3. Monitor JVM native memory usage (e.g., using ps, top, or a profiler).
4. Observe that native memory usage keeps increasing and is not reclaimed.

Expected Behavior:
Native memory usage should remain stable or fluctuate within reasonable bounds, not increase indefinitely.

Actual Behavior:
Native memory usage grows continuously, indicating a potential leak.

Environment:

• db-scheduler version: 16.0.0
• JVM: 21.0.8+9.0.LTS
• Spring Boot: 3.5.3
• Database: Postgres 16

Additional Information:

• No relevant heap memory leak detected.
• Issue persists across restarts and with minimal configuration.