B4J Library [Web][ABMaterial] Framework for WebApps

Harris · Oct 15, 2016

Hummm, something for AB to address it seems.

alwaysbusy · Oct 16, 2016

The methods in analysing the .bas files has changed in v2.00 (in preparation for B4JS). I will analyse the .b4j file first to see which .bas files are actually used in the project.

mindful · Oct 17, 2016

Hi Alain, are you going to make a quick fix for this ? I encounter the same problem ... I can't compile. I have a standard class and a code module that I use in my project and since the 2.0 upgrade I can't compile.

B4X:

Waiting for debugger to connect...
Program started.
Collecting data from B4J source files... (1/2)
Error occurred on line: 97 (ABMApplication)
java.lang.NullPointerException
    at com.ab.abmaterial.ExtractResultModule.ExtractMethods(Unknown Source)
    at com.ab.abmaterial.ExtractResultModule.PrepareModule(Unknown Source)
    at com.ab.abmaterial.ABMaterial.CheckApp(Unknown Source)
    at com.ab.abmaterial.ABMaterial.WritePageToDisk(Unknown Source)
    at b4j.example.abmapplication._addpage(abmapplication.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:612)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:229)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:159)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:90)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
    at b4j.example.main.main(main.java:29)

If I run the template app (that came with the library) it compiles, but when I add my files to it (a code and class module) the above error is thrown!

alwaysbusy · Oct 17, 2016

This will be first priority. Would you mind mailing me (alain.bailleul@pandora.be) your project? It would be useful to actually have a project that has this problem. Thanks in advance!

alwaysbusy · Oct 17, 2016

Seeing Mihai's project, it seems ABMaterials analysing code has some problems when the methods are defined without using brackets:

The problem:

You may have a couple of methods written like this (no brackets):

Private Sub GetNewUniqueID As Long
End Sub

When you change them to (with brackets):

Private Sub GetNewUniqueID() As Long
End Sub

the compilation will continue.

I'll try to catch these in 2.01, but for now, adding the brackets could solve your problem.

stanmiller · Oct 17, 2016

alwaysbusy said:
This will be first priority. Would you mind mailing me (alain.bailleul@pandora.be) your project? It would be useful to actually have a project that has this problem. Thanks in advance!

@alwaysbusy

Copy EXTRA.BAS or EXTRA2.BAS (attached) into any project. The Demo... the Template.... All will crash with it present.

Unlike EXTRA.BAS, EXTRA2.BAS is a valid, compilable module. Add it to the project and you get the same result. The web app throws an exception on startup.

So this is more about what the analyser is tripping over. What is in conflict?

For example, if I change Sub RootFolder to Sub xRootFolder in EXTRA2.BAS, the webapp will startup.

B4X:

Public Sub xRootFolder As String

    Return  ( sRootFolder ) 

End Sub

alwaysbusy · Oct 17, 2016

Same as I described above I think:

When I change:

Public Sub RootFolder As String
End Sub

to

Public Sub RootFolder() As String
End Sub

It goes through.

xRootfolder probably goes through because in that case, it is never used so the parser does not trip over it.

stanmiller · Oct 17, 2016

alwaysbusy said:
Seeing Mihai's project, it seems ABMaterials analysing code has some problems when the methods are defined without using brackets:

The problem:

You may have a couple of methods written like this (no brackets):

Private Sub GetNewUniqueID As Long
End Sub

When you change them to (with brackets):

Private Sub GetNewUniqueID() As Long
End Sub

the compilation will continue.

I'll try to catch these in 2.01, but for now, adding the brackets could solve your problem.

I see. Suffixing with empty parens worked. It now compiles.

B4X:

Public Sub RootFolder() As String
Return ( sRootFolder ) End Sub

In other words, every method without arguments should be given this treatment. I suppose one could write a RegEx expression and run across the project.

alwaysbusy · Oct 17, 2016

Yes, but just temporary. I'll solve this one in 2.01. It's a programming style I did not catch.

PCastagnetti · Oct 17, 2016

I have the same problem too:
I have tried to insert the brackets in all sub but the problem is still present.

The line that blocks the compilation is this:

B4X:

PageNeedsUpload.Add(ABM.WritePageToDisk(Page, File.DirApp & "/www/" & AppName & "/" & Page.Name & "/", Page.PageHTMLName, ABMShared.NeedsAuthorization))

I also have a project that contains subs without brackets and everything works properly.

I look forward to the Ver. 2.01, but if you need I can provide a simplified project with the problem.

Thank you

alwaysbusy · Oct 17, 2016

@PCastagnetti Yes, please do. You can mail it to alain.bailleul@pandora.be. It's a lot easier to find what is wrong with the parser. Thank you.

PCastagnetti · Oct 18, 2016

Thank @alwaysbusy you for your availability

I think I understand my problem:

it seems that ABMaterial verifies all .bas files, even those excluded from the project (I had a backup .bas where I had not added the brackets).

Thank you

alwaysbusy · Oct 18, 2016

@PCastagnetti Yes, 2.01 will investigate which .bas files are actually used.

incendio · Nov 4, 2016

Is online demo still available?
I tried, but only got running orange, blue & red circle.

alwaysbusy · Nov 4, 2016

Just tied it on several devices and seems to work. Press F5 (refresh).

Harris · Nov 4, 2016

alwaysbusy said:
Just tied it on several devices and seems to work. Press F5 (refresh).

I tried several hours ago from a site that never would connect (sat internet connection) - AND NOW IT DOES! Thanks to site re-factoring. Feedback also worked from this slow connection.

incendio · Nov 5, 2016

Just tried on-line demo on computer, it works.

Wow, Really impressed with its UI & functions, thanks for this framework.

I am a newbie in Java and web app, my main programming is in traditional client server database area with RDBMS database, connected via LAN/WAN using windows desktop application.

Currently, with the help from Remote Database Connector (RDC/Java RDC), I am able to expand database application with smartphone & tablet.

Can I use this framework to build web app that connect to RDBMS database via LAN or internet?

Harris · Nov 5, 2016

incendio said:
Just tried on-line demo on computer, it works.

Wow, Really impressed with its UI & functions, thanks for this framework.

I am a newbie in Java and web app, my main programming is in traditional client server database area with RDBMS database, connected via LAN/WAN using windows desktop application.

Currently, with the help from Remote Database Connector (RDC/Java RDC), I am able to expand database application with smartphone & tablet.

Can I use this framework to build web app that connect to RDBMS database via LAN or internet?

My short answer is - I don't know (not sure).

I use RDC with my B4A apps to connect (post new data and get system updates) with my MySQL backend.
I do this because I require a (local device) store and forward approach. Without local storage, you would demand full time internet connection to update your DB (which cannot be relied upon in my situation). Many others try this approach and fail more often than not.

Frankly, I don't see why, what you propose, could not be accomplished. B4J supports jRDC and ABM is built on top of B4J. Very interesting.

However, without a full time internet connection - one could not run (execute) the mobile application (ABM server app - in this case) to collect data / whatever it needs to do. Web-apps need a server to provide content / the entire app (HTML / JS). Hence, B4A / B4i that is stored / executed on device will do so (live on device) - and forward info upon internet service available (RDC).

Other knowledgeable members - please correct my erroneous statements for clarity, since all is my clouded interpretation.

(When ever we get sats up to provide ubiquitous cell service throughout the planet - this may be very possible - but don't hold your breath on this - you may expire long before it happens. That's what the EXPENSIVE sats are currently for (so you can buy additional hardware and services - with extremely low bandwidth!) ).

Thanks

Bladimir Carrillo · Nov 11, 2016

Harris said:
Other knowledgeable members - please correct my erroneous statements for clarity, since all is my clouded interpretation...

I am using the scenario that you explain, and I think it is the only way for now in the world not to depend on a connection that can fail. ABM / B4J will always be on the server side and B4A / B4i will always be client side (mobile). It is necessary to work offline, store data locally (mobile) and make a subsequent synchronization step to the server. However in a scenario where you always have WiFi or data available, other options such as messaging (WebSocket, GCM, FireBase) are very useful.

Regards

Harris · Nov 12, 2016

Bladimir Carrillo said:
However in a scenario where you always have WiFi or data available

Canada - A big (beautiful) country that lacks coverage everywhere. Provincial governments are now installing wifi in selected campgrounds (that are off the beaten track) so campers can stay connected. Venture outside these sites, you have no cell, no wifi, no F-all... (many say as it should be).

The mobile work force also has the same issue. Store and forward is the option.

I agree, when connection is available, use it. Otherwise, keep searching for a connection and update when found.
I live 15 km from a cell tower, yet have NO service.
City folks have this advantage over us country bumpkins... Mountains get in the way of cell signal.

B4J Library [Web][ABMaterial] Framework for WebApps

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