Fully agree. This is a well known issue that users of native interop from managed languages commonly encounter when they first start out. One of the first bugs I found in .NET related to this; the Ping component didn't expect that Finalize could be called on the same instance before a method on that instance finished executing.

What is less convenient is that Java doesn't have a handy method to ensure that an object is reachable, that the JVM won't optimize away or eliminate. .NET has GC.KeepAlive; AFAIK, Java doesn't have an equivalent. I asked a question about this on SO[1] some time ago. An approximate equivalent can be cobbled together, with probabilistic assignments to a volatile variable.

[1] http://stackoverflow.com/questions/22457002/whats-the-java-e...