B4J Question Application not running on Linux

Exception in runnable
java.lang.RuntimeException: java.nio.BufferUnderflowException
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:113)
at anywheresoftware.b4a.BA$2.run(BA.java:162)
at com.sun.javafx.application.PlatformImpl$4$1.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$4$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$4.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.gtk.GtkApplication.enterNestedEventLoopImpl(Native Method)
at com.sun.glass.ui.gtk.GtkApplication._enterNestedEventLoop(Unknown Source)
at com.sun.glass.ui.Application.enterNestedEventLoop(Unknown Source)
at com.sun.glass.ui.EventLoop.enter(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(Unknown Source)
at javafx.stage.Stage.showAndWait(Unknown Source)
at anywheresoftware.b4j.objects.Form.ShowAndWait(Form.java:172)
at b4j.example.frmlogin._show(frmlogin.java:224)
at b4j.example.main._loginfirst(main.java:195)
at b4j.example.main._appstart(main.java:131)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
at b4j.example.main.start(main.java:33)
at com.sun.javafx.application.LauncherImpl$5.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$5.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$4$1.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl$4$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$4.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication$3$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.nio.BufferUnderflowException
at java.nio.Buffer.nextGetIndex(Unknown Source)
at java.nio.DirectByteBuffer.getInt(Unknown Source)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.ReadInt(RandomAccessFile.java:122)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.readHelper(RandomAccessFile.java:346)
at anywheresoftware.b4a.randomaccessfile.RandomAccessFile.ReadObject(RandomAccessFile.java:335)
at b4j.example.hexcrypt._fromhexastring(hexcrypt.java:58)
at b4j.example.hexcrypt._crypt(hexcrypt.java:34)
at b4j.example.frmlogin._btnok_action(frmlogin.java:83)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
... 33 more

Click to expand...

Dim m As Map
    m = DBUtils.ExecuteMap(Main.BDD, "SELECT * FROM UserLogin WHERE login = ?", _
        Array As String(TFName.Text))
        Log(TFName.Text)
    If m.IsInitialized = False Then
        conx = False
    Else
        conx = True
        frommdp = m.Get("mdp") 'keys are lower cased!
        Log(PasswdF.Text)
        If PasswdF.Text <> "" Then
            Log("Avant")
            mdp = HexCrypt.Crypt("de", frommdp, "CleStructure", TFName.Text)
            Log("Apres")
        Else
            mdp = ""
        End If

.........

Public Sub Crypt(sAction As String, sStrInput As String, sCryptKey As String, sName As String) As String
  sAction = sAction.ToUpperCase
  Select sAction.ToUpperCase
  Case "de".ToUpperCase
      Return FromHexaString(sStrInput, sCryptKey, sName)
  Case "en".ToUpperCase
      Return ToHexaString(sStrInput, sCryptKey, sName)
  End Select
  Return "Rien"
End Sub
Private Sub FromHexaString(sStr As String, sCryptKey As String, sName As String) As String
    Dim sRes As String
    Dim raf As RandomAccessFile
    raf.Initialize(File.DirApp & "/.ndf", sName & ".dat", False)
    sRes = raf.ReadObject(raf.CurrentPosition)
    raf.Close
Return sRes
End Sub