Java- Win32 dll- process, process disappears after sometime.

Question

Hi there,
I have a Win32 dll component that invoke a process. When I use it with my Win32 client it works fine, but when i load that component with my java application (using System.load()) and use it with JNI the process disappears after some time.
- Is it possible that the process disappeared due to some memory optimizations made by JVM?
- Does JVM handles or have access to some process created_by/within that dll?
Thanks in advance.

Answer 1

Hi,
I don't know why it is disappearing, but what i know is:
1):- System.load() only 'loads' the required libraries. JVM can use only those libraries that are registered with JVM using System.load().
Secondly when you writes a code in class initializer as
static{
System.load( file );
It registers the library with your JVM as well as this class. Now any method called by this class will be passed to this dll.
Sometimes you might have seen a dump of HotSpot. It shows libraries that are sticked with JVM. Otherwise there are tens of other dlls loaded in the system.
So the System.load() only registers the dll to serve you on demand.
2):- JVM optimizes only it's own memory. What dlls or other native code is doing, is not handled by JVM.
3):- Similarly JVM deals only with it's own processes. The JVM has no concern with the processes started and managed by dlls.
If there could be a method to handle processes (like pausing it, resuming it, or stoping it etc.) then Thread.stop() might not was deprecated. :)
Regards,