B4J Question The process cannot access the file because it is being used by another process

[EvgenyB4A]

Hi,
I have 10 instances of b4J app that periodically make HTTP Post to external server.
Sometimes one or some instances fall with following error:

httputils2service._hc_responsesuccess (java line: -1)
java.io.FileNotFoundException: C:\Users\evgeny\AppData\Local\Temp\39 (The process cannot access the file because it is being used by another process)
at java.base/java.io.FileOutputStream.open0(Native Method)
at java.base/java.io.FileOutputStream.open(Unknown Source)
at java.base/java.io.FileOutputStream.<init>(Unknown Source)
at b4j/anywheresoftware.b4a.objects.streams.File.OpenOutput(Unknown Source)
at b4j/b4j.example.httputils2service._hc_responsesuccess(Unknown Source)
at jdk.internal.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at b4j/anywheresoftware.b4a.BA.raiseEvent2(Unknown Source)
at b4j/anywheresoftware.b4a.BA$3.run(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

How to solve this problem?

 

[Erel]

Add this at the beginning:

xui.SetDataFolder("YourApp")
HttpUtils2Service.Service_Create
Dim Folder As Int = Rnd(1, 1000000)
File.MakeDir(xui.DefaultFolder, Folder)
HttpUtils2Service.TempFolder = File.Combine(xui.DefaultFolder, Folder)