J/Direct Does Not Unload a DLL

Visual Studio 6.0

J/Direct unloads a DLL when the Microsoft VM discards the Java class that imported the DLL. For a Java application running under JVIEW, this does not occur until the process exits. For a trusted Java applet, this happens at some undetermined time after the browser has left the page containing the applet. The Microsoft VM attempts to keep Java classes loaded for several pages afterward in order to optimize applet refresh time in case the page is revisited.

If you need explicit control over the loading and unloading of DLLs, you need to call the Windows loader explicitly and use the call entrypoint to invoke functions dynamically. For more information on how to do this, see Dynamically Loading and Invoking DLLs.