Disable H2 shutdown hook

H2 registers a JVM shutdown hook to close the database upon reception of `SIGTERM`. However, the hook executes before the servlet context has shut down, so event processing can still be going on at that time, causing a flood of "database already closed" exceptions.

The H2 database is already closed as part of Alpine's `PersistenceManagerFactory#contextDestroyed` method, thus making the additional shutdown hook of H2 redundant anyway.

Signed-off-by: nscuro <[email protected]>

src/main/resources/application.properties

@@ -63,7 +63,7 @@ alpine.database.port=9092
 
 # Required
 # Specifies the JDBC URL to use when connecting to the database.
-alpine.database.url=jdbc:h2:~/.dependency-track/db
+alpine.database.url=jdbc:h2:~/.dependency-track/db;DB_CLOSE_ON_EXIT=FALSE
 
 # Required
 # Specifies the JDBC driver class to use.