關於SQL Server Native Client和JVM的問題

問題是當我們用SQL Native Client與JVM一起工作時，用JNI方法建立JVM始終失敗，錯誤很模糊，說是記憶體錯誤，經一老外出手，問題解決！原來SQL Native Client會佔用原本屬於JVM佔用的記憶體，導致JVM無法佔用記憶體.解決方案也很簡單：
static LPVOID lpReserved = NULL;
// Reserves a contiguous block of virtual address space large enough for a JVM.
// This is used to prevent DLLs from basing in large blocks of address space needed for a JVM.
 
void ReserveAddressSpaceForJVM() {
 if(lpReserved == NULL) {  
  lpReserved = VirtualAlloc(NULL, 500 * 1024 * 1024, MEM_RESERVE, PAGE_NOACCESS);  
 }
}

// Free the reserved address space.
// The CJDwsDataServices.Initialize() method calls this right before it creates a JVM.

void UnReserveAddressSpaceForJVM() {
 if(lpReserved != NULL) {   
  VirtualFree(lpReserved, 0, MEM_RELEASE);
 } 
}

在程式剛啟動時執行ReserveAddressSpaceForJVM即可.UnReserveAddressSpaceForJVM是當你覺得需要不保留空間時調用的