B4J Tutorial B4J HowTo's

rwblinn · Jan 3, 2014

Dear All,

While learning and exploring B4J, captured B4J HowTos. The B4J HowTos are either from own experience or inspired by hints from the B4J forum (Thanks to All!).

Please note, due to other commitments, the B4J HowTos are not regularly updated, information might not cover solutions possible with the latest B4J version.

The content layout is generated by Look4How a Open Source Knowledge Management Application written in B4J

IMPORTANT (June 07, 2018)
The B4J HowTos are not online available anymore, but can be downloaded (v201806079). To install: unzip to a folder of choice and open index.htm.
Updates are made on the fly and not posted, so check this post from time-to-time.

Enjoy B4J (B4X) like I do.

Antonio1 · Jun 22, 2014

Ciao Rob

Grazie...

fredo · Jul 11, 2014

Moin Rob,
great collection of information you created there. Thank you!

I'm new to B4J and just installed the environment.

I've tried a few howto's and it's flawless to work with and good to understand!

One Question:

- HowTo #15 throws an error "Property "stylesheets" does not exist or is read-only" (see log below)

- File "project.css" is in the files-folder

Could it be that I forgot to set something up?

Best regards,
fredo

B4X:

Program started.
B4JHowToSQLite v20140629
Error occurred on line: 65 (main).
com.sun.javafx.fxml.PropertyNotFoundException: Property "stylesheets" does not exist or is read-only.
    at com.sun.javafx.fxml.BeanAdapter.put(BeanAdapter.java:423)
    at com.sun.javafx.fxml.BeanAdapter.put(BeanAdapter.java:37)
    at javafx.fxml.FXMLLoader$Element.applyProperty(FXMLLoader.java:464)
    at javafx.fxml.FXMLLoader$Element.processPropertyAttribute(FXMLLoader.java:287)
    at javafx.fxml.FXMLLoader$Element.processInstancePropertyAttributes(FXMLLoader.java:195)
    at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:586)
    at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2430)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2136)
    at anywheresoftware.b4j.objects.PaneWrapper.LoadLayout(PaneWrapper.java:134)
    at b4j.example.main._appstart(main.java:171)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:563)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:224)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:156)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:93)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:82)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:84)
    at b4j.example.main.start(main.java:35)
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:215)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
    at java.lang.Thread.run(Thread.java:722)

rwblinn · Jul 11, 2014

Hi Fredo,

to go for sure have downloaded this howto and executed without any issues. This app has been developed using JDK 8 and JavaFX 2. Found in several threads, that when using JDK 7 this error occurs when an app has been developed using JDK 8. It is fixed when upgrading to JDK 8.
Pls verify which JDK version you use?

Thanks for your feedback - as always encouraging to continue.

fredo · Jul 12, 2014

rwblinn said:
...
It is fixed when upgrading to JDK 8.
...

I've just installed JDK 8 and now it works perfectly.

Thanks for the hint, Rob

B4JExplorer · Sep 2, 2014

rwblinn said:
To run the access database example, ensure to copy the addtional libraries (packed in dbdrivermsaccess.zip part of the example zip) to your B4J additional library folder.

Thank You

Robert,

Sorry, but I don't see the dbdrivermsaccess.zip file in the XML-based version 1, or the Sqlite-based version 2.

When compiling version 1, it complains about this line:

gDlg.ShowMessage2(strMsg, strHdg, gDlg.MSGTYPE_INFORMATION)

, an unknown member error.

jRLStringPlus, jRLWinBatteryInfo, jrlmsgdialogs, and jrlini from your site, have all been installed in libraries.

When compiling the offline version 2 reader,

it complains about a missing jna-3.5.1.jar. A google search for 'b4j jna-3.5.1.jar', indicates that it's referenced on your BatteryInfo page http://www.rwblinn.de/142k1t43.htm, but when you link to that page, it isn't there.

The latest jna is available on github, but I don't think it has the wrapper and xml that's required by B4J.

rwblinn · Sep 12, 2014

Hi,

thanks for feedback. Pls find my reply:

The dbdrivermsaccess.zip file is included in B4J HOWTO Example project Nr. 12 (I have checked again)
12. Open and load MS Access Database records
http://www.rwblinn.de/b4j/b4jhowto/examples/b4jhowtomsaccess.zip
The B4J HOWTO Offline Readers do not require jna-3.5.1.jar. You can check this by reviewing the project attributes as defined in the b4j files.
For version 1, if you receive an error for the Message Dialog, you might have the wrong version of the jRLMsgDialogs Library. Ensure to use version 1.14, which is attached.

The Battery Info Library uses jna 4.1.0 as referenced in the readme.txt:
http://www.rwblinn.de/b4j/opensource/jrlwinbatteryinfo.zip
You do not need a wrapper for B4J - ensure to include the additional jna library in the project attributes.

Good Luck further in Exploring B4J...

B4JExplorer · Sep 14, 2014

rwblinn said:
Hi,

thanks for feedback. Pls find my reply:

The dbdrivermsaccess.zip file is included in B4J HOWTO Example project Nr. 12 (I have checked again)
12. Open and load MS Access Database records
http://www.rwblinn.de/b4j/b4jhowto/examples/b4jhowtomsaccess.zip
The B4J HOWTO Offline Readers do not require jna-3.5.1.jar. You can check this by reviewing the project attributes as defined in the b4j files.
For version 1, if you receive an error for the Message Dialog, you might have the wrong version of the jRLMsgDialogs Library. Ensure to use version 1.14, which is attached.

The Battery Info Library uses jna 4.1.0 as referenced in the readme.txt:
http://www.rwblinn.de/b4j/opensource/jrlwinbatteryinfo.zip
You do not need a wrapper for B4J - ensure to include the additional jna library in the project attributes.

Good Luck further in Exploring B4J...

rwblinn,

Sorry, I didn't see your reply until now. Thanks, will check it out today.

Mark Zraik · Mar 22, 2015

rwblinn said:
Dear All,

While (keep on) learning and exploring B4J, I have started to capture B4J HOWTOs and published those with many example projects on my website.

The HOWTOs are either from own experience or based on hints from the B4J forum.

Updates are commenced regularly: Go here - Read Information > Whats New first.

Status 2015-03-04 = 481 B4J HOWTOs and 67 Open Source Example Projects.

B4J HOWTO Offline Readers (Open Source)
B4J: Version 1 for Windows (XML DB)
B4J: Version 2 for Windows (SQLite DB)
B4A: Version for Android 4+ (SQLite DB)

Enjoy B4J (and B4A, B4i) like I do.

Thank you so much for your hard work!
Mark

rbsoft · Aug 12, 2015

Excellent work. Extremely helpful.
Thank you very much.

Rolf

Ju Yang · Sep 15, 2015

Really great job, thanks very much.

rwblinn · Dec 24, 2015

B4J HowTos Updated Dec 24, 2015: Read Whats New first. Total 834 HowTos, 107 Examples.

Roger Daley · Jan 1, 2016

Hi Rob,

Your "HowTo's" has become my first reference in B4J queries. Thanks heaps.

Regards Roger

rwblinn · Jan 31, 2016

B4J HowTos Updated Jan 31, 2016: Read Whats New first. Total 888 HowTos, 107 Examples.

(just a side remark)
Got this month (unexpected) involved in various B4A app developments - it is great to see how code can be reused between B4A <> B4J, but also how fast apps (esp prototypes) can be developed using B4A = real RAD comes true here.

rwblinn · Feb 24, 2016

B4J HowTos Updated Feb 24, 2016: Read Whats New first. Total 944 HowTos, 114 Examples.

Getting close to 1111101000...

rwblinn · Mar 30, 2016

B4J HowTos Updated Mar 30, 2016: Read Whats New first. Total 1000 HowTos, 126 Sample Projects.

Notes
In progress of redesigning my homepage using w3.css. The B4J HowTos are also available in w3.css responsive format: Select B4X > B4J HowTos.
Have tested the usage of my homepage on various mobile devices. Results look promising so far.

B4JExplorer · May 7, 2016

rwblinn said:
Dear All,

While (keeping on) learning and exploring B4J, started to capture B4J HowTos and published those with many sample projects on my website.
The B4J HowTos are also available in responsive format at Select B4X > B4J HowTos.

The B4J HowTos are either from own experience or based on hints from the B4J forum (Thanks to All!).

Update Apr 30, 2016

Go here and read //Information > Whats New first.

1016 HowTos and 127 Sample Projects

B4J HOWTO Offline Readers (Open Source)

B4J: Version 1 for Windows (XML DB)

B4J: Version 2 for Windows (SQLite DB)

B4A: Version for Android 4+ (SQLite DB)

Enjoy B4J (and B4A, B4i) like I do.

Hi Robert,

I tried compiling version 1, and received the

Error description: Unknown type: jrlmsgdialogs

error.

Then, when Compiling to Library the jRLDialogs class at http://www.rwblinn.de/142k1t40.htm,

the error

Error description: Access to the path 'C:\Software\Freeware\B4J\jRLDialogs\Objects\src\b4j\example' is denied

occurs.

After creating the b4j/example folder in the jRLDialogs class and copying it to the B4J Libraries folder, and closing & restarting the project, the original error that

Error description: Unknown type: jrlmsgdialogs

still occurs. jrlmsgdialogs is checked off, in the libraries form.

rwblinn · May 7, 2016

Hi,

based on your request, took following steps to verify:
1) Downloaded B4J: Version 1 for Windows (XML DB)..
2) The zip file contains the library jRLMsgDialogs v1.10. Copied jRLMsgDialogs.jar and jRLMsgDialogs.xml to the B4J Additional Libraries Folder.
3) Opened B4JHowTo.b4j in the B4J IDE (B4J v4.20 (1).
4) Verified the jRLMsgDialogs library in the B4J IDE list. Result version 1.1 listed and checked.
5) Compiled and run B4JHowTo v1 without issues.

Could you please check if the steps 1 - 5 will work in your environment.

Appreciated.

B4JExplorer · May 7, 2016

The version may be the problem.

http://www.rwblinn.de/142k1t40.htm apparently contains version 1, rather than 1.1. The compilation works, only if gDlg as jRLDialogs, rather than jRLMsgDialogs.

I'll search around for the 1.1 version, and try again.

One interesting quirk, after compiling and testing this, is that my other non-ui apps won't compile now, unless an ../Objects/src/b4j folder is defined.

B4JExplorer · May 7, 2016

All set. You had forwarded me a link to jrlmsgdialogs in a previous post, from a couple of years ago.

https://www.b4x.com/android/forum/threads/b4j-howtos.36350/page-2#post-421751

, but after trying in vain for 3-4 days to get it working back then, I had to move on. It works now, very nicely.

Thanks, RWB.

rwblinn · Jun 21, 2016

B4J HowTos Updated Jun 21, 2016: Read News first. Total 1052 HowTos, 136 Examples.

Notes
Slowed down a bit in developing new B4J HowTos as been focussing on the new B4R development tool - for which I developed in the mean time 31 sample experiments (go here, select B4X > B4R > Arduino or ESP8266). Some of the B4R experiments show the integration between B4R and B4J - one of the great B4X power features.

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