B4J Question My App Freeze on Raspberry Pi

ggranata · Feb 3, 2023

Hi,
I've a problem with my app. In this app, I have UDP Socket and every time that receives a packet, refresh the UI: I've a single form and when refresh the data I remove all nodes and load the layout. It works fine for hours until it freezes. In my log, I don't see any error.
Any help is welcome.
Thanks

Erel · Feb 5, 2023

I guess that some resource isn't cleared. Best solution is to work a bit harder and reuse the views instead of creating new views each time.

ggranata · Feb 6, 2023

Thanks for help. I cannot reuse the views because layouts is inside the udp packet. My base form is a table: when receive a packet, I remove some cells. Can I force Java garbage collection? Alternatively, how I can clear all view resources before to load layout?

jahswant · Feb 6, 2023

ggranata said:
how I can clear all view resources before to load layout?

Parent.RemoveAllViews

ggranata · Feb 6, 2023

jahswant said:
Parent.RemoveAllViews

Thanks for reply but I cannot fine the method.
This is my code:

Change Layout:

Private Sub ChangePage(page As Int )
    Dim layout As String
    'Rimuovo tutti i nodi
    MainForm.RootPane.RemoveAllNodes
    
    Select Case page
        Case Constants.PAGE_WAITINGLINK
            layout = "WaitingLink"
        Case Constants.PAGE_PAIRING
            layout = "Pairing"
        Case Constants.PAGE_PAIRED
            layout = "Paired"
        Case Constants.PAGE_DATA
            layout = "BasePanel"
    End Select
    
    m_ActualPage = page
    
    'Carico il nuovo layout
    MainForm.RootPane.LoadLayout(layout)
End Sub

Erel · Feb 6, 2023

ggranata said:
Can I force Java garbage collection?

Never helps.

My guess is that it is a leak in the underlying RPi framework. There is no such thing that you can't reuse views. It might require some work but it is possible.

B4J Question My App Freeze on Raspberry Pi

ggranata

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Erel

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ggranata

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jahswant

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ggranata

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Erel

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B4J Question My App Freeze on Raspberry Pi

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