B4J Question [SOLVED] Maddening list bug

JackKirk · Sep 20, 2021

I've tried everything I can think of to fix this - last resort: post a question...

Here is the code:

Code:

Log(xxxx.Size)
Log(xxxx.IsInitialized)
        'For each ticket web request file...
        For wrk_ptr = 0 To xxxx.Size - 1                        '<<<<< this is line 631

wrk_ptr is an Int

Here is the log:

Waiting for debugger to connect...
Program started.
0
true
Error occurred on line: 631 (Main)
java.lang.RuntimeException: Object should first be initialized (List).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:49)
at anywheresoftware.b4a.objects.collections.List.getSize(List.java:134)
at b4j.example.main$ResumableSub_Event_obj_check_web_backlog_timer_Tick.resume(main.java:2217)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resumeAsUserSub(DebugResumableSub.java:47)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:632)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at jdk.internal.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:108)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resume(DebugResumableSub.java:42)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:153)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:102)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.keywords.Common$3.run(Common.java:1103)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)

I have tried everything including cleaning the project, shutting down the PC etc but still it persists.

I know I'm doing something stupid but what...

Heuristx · Sep 20, 2021

xxxx.Initialize

JackKirk · Sep 20, 2021

Heuristx said:
xxxx.Initialize

Log(xxxx.IsInitialized)

is returning true

DonManfred · Sep 20, 2021

JackKirk said:
Log(xxxx.IsInitialized)

If this logs false then your list is not initialized.
Trying to access the size after this check on a not initialied list gives the error.

B4X:

Log(xxxx.IsInitialized)
if xxx.Isinitialied then
  'For each ticket web request file...
  For wrk_ptr = 0 To xxxx.Size - 1 
  next
end if

Heuristx · Sep 20, 2021

Have you explicitly typed xxxx.Initialize? It is not in your code.

DonManfred · Sep 20, 2021

JackKirk said:
Log(xxxx.IsInitialized)

is returning true

Upload a small project showing the issue.

JackKirk · Sep 20, 2021

DonManfred said:
If this logs false then your list is not initialized.

DonManfred - it is logging true

JackKirk · Sep 20, 2021

Heuristx said:
Have you explicitly typed xxxx.Initialize? It is not in your code.

Yes

agraham · Sep 20, 2021

Does this only happen under debug? Is it OK when in release mode. There was a debug bug at one time that looked like this.

DonManfred · Sep 20, 2021

JackKirk said:
DonManfred - it is logging true

But the size is 0.

B4X:

if xxxx.Isinitialied and xxxx.Size > 0 then
  for next loop here....
end if

TILogistic · Sep 20, 2021

test:
Have you checked the variable name?

B4X:

    Dim MyList As List
    MyList.Initialize

    Log("---For Not Data---")
    
    Log(MyList.IsInitialized)
    Log(MyList.Size)
    
    For i = 0 To MyList.Size -1
        Log(MyList.Get(i))
    Next
    
'    For Each i As Int In MyList
'        Log(i)
'    Next
    
    Log("---For with Data---")
    
    MyList = Array (100, 200, 300, 400, 500)
    
    Log(MyList.IsInitialized)
    Log(MyList.Size)
    
    For i = 0 To MyList.Size -1
        Log(MyList.Get(i))
    Next
    
'    For Each i As Int In MyList
'        Log(i)
'    Next

JackKirk · Sep 20, 2021

agraham said:
Does this only happen under debug? Is it OK when in release mode. There was a debug bug at one time that looked like this.

agraham - it does it in release mode too!

DonManfred said:
B4X:

Code:

if xxxx.Isinitialied and xxxx.Size > 0 then for next loop here.... end if

DonManfred - if I change the code to:

B4X:

Log(xxxx.Size)
Log(xxxx.IsInitialized)
        If xxxx.Size > 0 Then                '<<<<<< fails on this statement (632)
        'For each ticket web request file...
        For wrk_ptr = 0 To xxxx.Size - 1

Waiting for debugger to connect...
Program started.
0
true
Error occurred on line: 632 (Main)
java.lang.RuntimeException: Object should first be initialized (List).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:49)
at anywheresoftware.b4a.objects.collections.List.getSize(List.java:134)
at b4j.example.main$ResumableSub_Event_obj_check_web_backlog_timer_Tick.resume(main.java:2237)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resumeAsUserSub(DebugResumableSub.java:47)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:632)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at jdk.internal.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:108)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resume(DebugResumableSub.java:42)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:153)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:102)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.keywords.Common$3.run(Common.java:1103)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)

DonManfred · Sep 20, 2021

Again. Upload a small project showing the issue.

Probably the error is happening on another line of what you posted.

I´m not further interested to help with this less info, no example showing the problem. Good luck.

b4j.example.main$ResumableSub_Event_obj_check_web_backlog_timer_Tick.resume(main.java:2237)
what is java line 2237. Post the relevant lines.

JackKirk · Sep 20, 2021

DonManfred said:
Again. Upload a small project showing the issue.

I tried to do this but of course, it worked.

DonManfred said:
b4j.example.main$ResumableSub_Event_obj_check_web_backlog_timer_Tick.resume(main.java:2237)
what is java line 2237. Post the relevant lines.

The code is in a timer tick event (Event_obj_check_web_backlog_timer_Tick) that has some resumable components.

It is a major bit of code.

DonManfred said:
I´m not further interested to help with this less info, no example showing the problem. Good luck.

I'm as frustrated as you are, believe me, what I am really struggling with is that the immediately preceding log statements indicate all should be OK.

JackKirk · Sep 20, 2021

DonManfred said:
Probably the error is happening on another line of what you posted.

How is this possible if the log statements are to be believed?

JackKirk · Sep 20, 2021

It just keeps on getting weirder, I tried this:

B4X:

Log(xxxx.Size)
Log(xxxx.IsInitialized)
        Private garbage As Int
        garbage = xxxx.Size
        'For each ticket web request file...
        For wrk_ptr = 0 To garbage - 1          '<<<< this is line 634 it is failing on

Log is:

Waiting for debugger to connect...
Program started.
0
true
Error occurred on line: 634 (Main)
java.lang.RuntimeException: Object should first be initialized (List).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:49)
at anywheresoftware.b4a.objects.collections.List.getSize(List.java:134)
at b4j.example.main$ResumableSub_Event_obj_check_web_backlog_timer_Tick.resume(main.java:2224)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resumeAsUserSub(DebugResumableSub.java:47)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:632)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at jdk.internal.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:108)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.shell.DebugResumableSub$DelegatableResumableSub.resume(DebugResumableSub.java:42)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:153)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:102)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.keywords.Common$3.run(Common.java:1103)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)

agraham · Sep 20, 2021

There is something wrong there. The error line 634 quoted does not reference a List. Check the declared type of work_ptr.

JackKirk · Sep 20, 2021

agraham said:
There is something wrong there. The error line 634 quoted does not reference a List. Check the declared type of work_ptr.

Yes, here is a bit more detail:

B4X:

Log(xxxx.Size)
Log(xxxx.IsInitialized)
        Private garbage As Int
Log("ababab")
        garbage = xxxx.Size
Log("cdcdcd")
Log(GetType(wrk_ptr))
Log(GetType(wrk_ticket_web_request_file))
Log(GetType(xxxx))
        'For each ticket web request file...
        For wrk_ptr = 0 To garbage - 1          '<<<<<<bombing on line 639
Log("efefef")
            wrk_ticket_web_request_file = xxxx.Get(wrk_ptr)

Log is:

Waiting for debugger to connect...
Program started.
0
true
ababab
cdcdcd
java.lang.Integer
java.lang.String
java.util.ArrayList
Error occurred on line: 639
java.lang.RuntimeException: Object should first be initialized (List).
at anywheresoftware.b4a.AbsObjectWrapper.getObject(AbsObjectWrapper.java:49)
at anywheresoftware.b4a.objects.collections.List.getSize(List.java:134)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:632)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:234)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
at jdk.internal.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:108)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.shell.DebugResumableSub$RemoteResumableSub.resume(DebugResumableSub.java:21)
at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:153)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:102)
at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:95)
at anywheresoftware.b4a.keywords.Common$3.run(Common.java:1103)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)

and for good measure here is a screenshot:

agraham · Sep 20, 2021

At the risk of going down a rabbit hole post the main.java file in the project Objects/src/.... folder tree

JackKirk · Sep 20, 2021

agraham said:
At the risk of going down a rabbit hole post the main.java file in the project Objects/src/.... folder tree

The project is part of a ticketing system which I don't want broadcast - I note you don't answer questions by PM but I will try my luck and send it to you that way...

B4J Question [SOLVED] Maddening list bug

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