FIX: Memory Leaks in Java/COM When You Use Variant or SafeArray Parameters (275610)

MORE INFORMATION

Steps to Reproduce Behavior

These steps assume that you have the Microsoft Software Development Kit (SDK) for Java installed on your computer. You can download the Microsoft SDK from the following Microsoft Web site: These steps also assume that are you familiar with the Component Services administrative tool in Windows 2000.

1. Create a file named VariantLeakTest.java, and paste the following code:

   import com.ms.com.ComLib;
   import com.ms.com.Variant;
   import com.ms.lang.SystemX;
   import variantleakcomponent.VariantLeakComponent_Dispatch;
   
   public class VariantLeakTest
   {
       static void DoWork()
       {
           Variant                                     var;
           variantleakcomponent.VariantLeakComponent   disp;
   
           var = new Variant( "foo" );
           disp = new variantleakcomponent.VariantLeakComponent();
   
           disp.MethodReceivingVariant( var );
   
           var.VariantClear();
           ComLib.release( disp );
       }
   
       public static void main( String[] args ) throws Throwable
       {
           ComLib.declareMessagePumpThread();
   
           for( int iOuter = 0; iOuter < 100; iOuter++ )
           {
               for( int iInner = 0; iInner < 100; iInner++ )
               {
                   DoWork();
               }
   
               System.out.print( "*" );
               SystemX.gc();
           }
   
           System.out.println();
           System.out.print( "press <enter> to exit" );
           System.in.read();
       }
   }
   					

2. Create a file named VariantLeakComponent.java, and paste the following code:

   import com.ms.com.Variant;
   
   public class VariantLeakComponent
   {
       public void MethodReceivingVariant( Variant var )
       {
       }
   }
   					

3. From a command prompt, type the following lines to build the sample files:

   jvc /x- /nomessage VariantLeakComponent.java
   
   javareg /register /class:VariantLeakComponent /clsid:{aa9161e0-43a8-4d58-b761-4412bbe23ff4} /progid:VariantLeakComponent /typelib:VariantLeakComponent.tlb /q
   
   jactivex /javatlb /xi /d . VariantLeakComponent.tlb
   
   jvc /x- /nomessage VariantLeakTest.java

4. Use the Component Services administrative tool to create a COM+ application with library activation, and import the VariantLeakComponent component.
5. From a command prompt, type the following line to run the sample:

   jview VariantLeakTest

   View the "Mem Usage" (Memory Usage) and "Handles" (Handles Count) columns in Task Manager.