Android Question Socket is null inside Connected event (Successful = True) — what can cause this?

[knutf]

Hello

I got java.lang.NullPointerException when extracting inputStream/outputStream from Socket in Socket connected event.

It was this line that threw the error:

pStream.InitializePrefix(pSocket.InputStream,True,pSocket.OutputStream,"pStream")

Private Sub pSocket_Connected (Successful As Boolean)
    Log($"pSocket_Connected Successful: ${Successful}"$)
    pConnecting = False
    If Successful Then
        If pStayConnected Then
            pConnected = True
            CallSubDelayed(mTarget,mEventName & "_Connected")
            pStream.InitializePrefix(pSocket.InputStream,True,pSocket.OutputStream,"pStream")
            Dim ser As B4XSerializator
            Dim Bytes() As Byte = ser.ConvertObjectToBytes("Authenticate connection")
            If pConnected Then pStream.Write(Cip.Encrypt(Bytes,pCipherPassword))
            
            Log($"pRequestsEncrypted.size:${pRequestsEncrypted.Size}"$)
            For Each id In pRequestsEncrypted.Keys
                pRequestStartTimes.Put(id,DateTime.Now)
                Dim data() As Byte = pRequestsEncrypted.Get(id)
                pStream.Write(data)
                pLastTimeDataIsSent = DateTime.Now
                pLastDataSentWasAPing = (pRequestTargets.Get(id)=Me)
            Next
            
            broadcast.dbConnected(pStream)
        Else
            pSocket.Close
        End If
    End If
End Sub

The stacktrace is

java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.InputStream java.net.Socket.getInputStream()' on a null object reference
at anywheresoftware.b4a.objects.SocketWrapper.getInputStream(SocketWrapper.java:239)
at knutf.tractorOffice.dbconnection._psocket_connected(dbconnection.java:369)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:221)
at anywheresoftware.b4a.BA$2.run(BA.java:395)
at android.os.Handler.handleCallback(Handler.java:761)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6623)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

At this point I’m trying to understand how pSocket can be null inside the Connected event, even though Successful = True and the event should only fire after the socket is initialized.

Has anyone seen this before?

A few things I’m unsure about:

• Can the Java socket be disposed or closed before InitializePrefix runs, even when Successful is true?
• Is there any scenario where the wrapper triggers Connected but the underlying socket is already null?
• Should I explicitly check pSocket.IsInitialized or pSocket.Connected inside the event, or would that just mask a deeper issue?

If anyone has insight into what could cause getInputStream() to return null here, I’d really appreciate suggestions on how to debug or prevent it.

 

[Sandman]

Comment out line seven (CallSubDelayed), does it make a difference?