B4J Library [tool] Compile project with different version of Java

Sub AppStart (Args() As String)
    Log("Project Compiler v1.00")
    Dim inifolder As String = File.Combine(File.DirData("Anywhere Software"), "B4J")
    If File.Exists(inifolder, "b4xV5.ini") = False Then
        Log("Can't find B4J ini file.")
        ExitApplication2(1)
    End If
    Dim javabin As String = GetSystemProperty("javabin", "")
    Log($"javabin: ${javabin}"$)
    If File.Exists(javabin, "javac.exe") = False Then
        Log("Can't find javac.exe")
        ExitApplication2(1)
    End If
    File.Copy(inifolder, "b4xV5.ini", inifolder, "inibackup.bak")
    Dim ini As List = File.ReadList(inifolder, "b4xV5.ini")
    For i = 0 To ini.Size - 1
        Dim line As String = ini.Get(i)
        If line.StartsWith("JavaBin") Then
            ini.Set(i, $"JavaBin=${javabin}"$)
        End If
    Next
    File.WriteList(inifolder, "b4xV5.ini", ini)
    Try
        Dim builder As String = File.Combine(GetSystemProperty("b4x", ""), "B4JBuilder.exe")
        Dim shl As Shell
        shl.Initialize("", builder, Args)
        Dim res As ShellSyncResult = shl.RunSynchronous(60000)
        Log($"Exit code: ${res.ExitCode}
StdOut: ${res.StdOut}
StdErr: ${res.StdErr}
"$)
    Catch
        Log(LastException)
    End Try
    File.Copy(inifolder, "inibackup.bak", inifolder, "b4xV5.ini")
End Sub