B4J Question [SOLVED][Server] How I can compile/build HelloWorld example for Synology NAS?

Elric · Nov 10, 2020

Hello to everybody!

Maybe this is a silly question but I've not found an answer...

I would like to test this https://www.b4x.com/android/forum/threads/server-building-web-servers-with-b4j.37172/#content on my NAS Synology DS215J.

Of course, I cannot build a standalone package because this project is not a UI app.

Well: what I've to do?

Thank you!

DonManfred · Nov 11, 2020

Elric said:
on my NAS Synology DS215J

I don´t think you can run B4J Apps (UI and NonUI) on this Device. It does not have java installed. And you are not able to install it.
The Device is a NAS and not a SERVER

Elric said:
Well: what I've to do?

Install the App on your VPS or Server. Both must have java installed and able to run java apps.

Erel · Nov 11, 2020

[server] Run a Server on a VPS

Elric · Nov 11, 2020

Thank you Erel and DonManfred!

Well

DonManfred said:
Install the App on your VPS or Server. Both must have java installed and able to run java apps.

Dummies question: how I can create the App?

Usually I use the "Build standalone package" in "Project" menu for UI app. But for the server? If I use the same command I get an error:

Well, what I have to do?

DonManfred said:
I don´t think you can run B4J Apps (UI and NonUI) on this Device. It does not have java installed. And you are not able to install it.
The Device is a NAS and not a SERVER

I've assumed I could run the Erel's example onto NAS because the Erel's example may run on PC and raspberry and because NAS give me the availability to install the following packages:

Java8 (developped by Synology);
Java SE Embedded 8 (Oracle);
Maria DB 10 and 5;
phpAdmin;
PHP up to version 7.4.

and this tutorial: https://www.synology.com/en-us/know...ication/How_to_host_a_website_on_Synology_NAS.

Moreover, I've also taken in consideration the Erel's hint above:

Erel said:
[server] Run a Server on a VPS

I'd like to discover if my assumption is correct but to try that I've to solve my dummies question above.

Erel · Nov 11, 2020

You don't need to build a package. Make sure that #MergeLibraries is set to true and run your program in release mode.

The libraries and your code will be compiled in the the jar file that is created in the objects folder.

You can run this jar file with java -jar. See the tutorial I've linked to.

josejad · Nov 11, 2020

DonManfred said:
I don´t think you can run B4J Apps (UI and NonUI) on this Device. It does not have java installed. And you are not able to install it.
The Device is a NAS and not a SERVER

Synology devices runs an operating system called DSM. They can act as a server. In fact, I run a mysql+php web server on it.
You can install the java package too, and I run a jRDC2 server on it too with, so probably any other kind of server.

Elric said:
what I've to do?

Install java package

Run a task in the task manager (try the command with the ssh console)

B4X:

nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar /volume1/web/jRDC.jar > /volume1/web/nohup.out

Elric · Nov 12, 2020

Thank you!

Erel said:
You don't need to build a package. Make sure that #MergeLibraries is set to true

Ok, it is set to true.

Erel said:
and run your program in release mode.

done.

1. I've run in release mode three times, with three different JDK (changing "configure path"):

jdk1.8.0_191
jdk-11.0.1
jdk-14.0.1

and I've gotten three different files that I renamed and put them in web directory of my NAS:

2. Java8 is already installed on my NAS

3.

José J. Aguilar said:
Run a task in the task manager (try the command with the ssh console)

Not clear for me, sorry. Do you mean this link?

4. Despite the no. 3, in "Panel Control -> Task Scheduler -> Create -> Triggered Task > User-defined script" I've created a new task:

and I've put the following code in Task Settings:

B4X:

nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar /volume1/web/HelloWorld01-8.jar > /volume1/web/nohup.out

5. Then in "Panel Control -> Task Scheduler", I've selected my task and clicked "Run".

6. In my browser, I've put the address: "http://192.168.1.18:8888/" (IP LAN NAS is "192.168.1.18") and gotten this error:

?

Erel · Nov 12, 2020

Don't forget to copy the www folder.

josejad · Nov 12, 2020

Elric said:
Not clear for me, sorry. Do you mean this link?

Yes. This way you can start/stop the server and make tests. After you get the right way of starting/stopping and the server is running fine, then you can create the task with the tested command.
Anyway, it seems to be working¡¡

Elric · Nov 12, 2020

Erel said:
Don't forget to copy the www folder.

... indeed!

Well, I've:

copied the www directory and
restarted the NAS

but the result is the same:

Elric said:
View attachment 102853
?

José J. Aguilar said:
Anyway, it seems to be working¡¡

Not for me! ?

I'd like to see the Erel's HelloWorld example pages!

josejad · Nov 12, 2020

Elric said:
copied the www directory and

Where have you copied it? To /volume1/web/?

Elric said:
Not for me! ?

I mean at least your getting a response from the server (Jetty message...)

Elric · Nov 12, 2020

José J. Aguilar said:
Where have you copied it? To /volume1/web/?

Yes. I'm in RAID 1. I've access just to volume 1 with file manager. By the way, is the same directory of the jar file.

José J. Aguilar said:
I mean at least your getting a response from the server (Jetty message...)

Yes, I've understood that. I was just sarcastic with myself!

It is a very good result for me getting a response by Jetty, just missing the final result and I don't understand why.

Elric · Nov 12, 2020

I've tried:

to unzip the original example and to compile it in release mode (jdk1.8.0_191)
to change NAS folder:

to restart the NAS.

The task seems to be ok because the file "nohup.out" is created. Opening this file with text editor I can read just "Server started".

The 404 error is still present.

Why?!?

Elric · Nov 12, 2020

Moreover:

B4X:

http://192.168.1.18:8888/hello

works partially:

without image (but "logo.png" is in "www/images") and "back" link bring me to "192.168.1.18:8888" with the same 404 error.

(same result both Chrome and Firefox).

Erel · Nov 13, 2020

You haven't put the www folder in the correct place.

Elric · Nov 13, 2020

Erel said:
You haven't put the www folder in the correct place.

Thank you Erel. I've tried to understand where is the correct place.

Then, as first thing, reading post #1 of this thread and following the hint of JoséJ. Aguilar, I've turned back in "web" directory instead of "public" and put everything in apposite "srvHelloWorld", with the aim to separate this project by every other thing:

and then updated the task:

B4X:

nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar /volume1/web/srvHelloWorld/HelloWorld8.jar > /volume1/web/srvHelloWorld/nohup.out

I've also put a Log command in b4j project:

B4X:

    srvr.StaticFilesFolder = File.Combine(File.DirApp, "www")
    Log(File.DirApp)
    srvr.LogsFileFolder = File.Combine(File.DirApp, "logs")
    srvr.AddHandler("/hello", "HelloPage", False)
    srvr.AddHandler("/FormExampleHelper", "FormExampleHelper", False)
    srvr.AddHandler("/FileUpload", "FileUpload", False)

thinking that maybe this would have given me some more info.

I've tried to put the "www" folder in:

same folder where HelloWorld8.jar is (i.e. as subfolder - please see image above)
same folder where folder containing HelloWorld8.jar is (i.e. both "www" and "srvHelloworld" folders are in "web" folder)
in the main directory of NAS (i.e. "www" folder at same level of "web" folder)

Then, I've restarted the NAS.

But without success.

The command Log(File.DirApp) returns me a simple "/" in noh.out file (nothing that the 404 error doesn't already give me) a part the other log command "Server started".

Maybe should I change something in the code to adapt it to NAS architecture?

Erel · Nov 15, 2020

Try to change the task to:
cd /volume1/web/srvHelloWorld
nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar HelloWorld8.jar >nohup.out

Elric · Nov 15, 2020

EUREKA! ?

Thank you very much! The solution was simpler than I could imagine!

At the beginning I've got "ERROR_CONNECTION_REFUSED" but adding "/volume1/web/srvHelloWorld/" before "HelloWordl8.jar" it works perfectly!!!

Then, the working code in "Panel Control -> Task Scheduler -> Create -> Triggered Task > User-defined script":

B4X:

cd /volume1/web/srvHelloWorld
nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar /volume1/web/srvHelloWorld/HelloWorld8.jar > /volume1/web/srvHelloWorld/nohup.out

YES!✌ YES! ?

Dadaista · Nov 20, 2020

Hi
That is not working on my synology

Must I copy the files from www dir of the project to the dir where I copied file.jar in the synology?
Must I execute additional .jar/task in the synology to execute this example?

I have added the task

B4X:

nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar volume1/web/webapp/HelloWorld/WebAppHelloWorld.jar > /volume1/web/webapp/HelloWorld/nohup.out

I am running another web Server in port 80/443
nohup.out is empty

hatzisn · Nov 20, 2020

Dadaista said:
Hi
That is not working on my synology

Must I copy the files from www dir of the project to the dir where I copied file.jar in the synology?

You must copy the entire www folder as it is in B4j objects folder.

Dadaista said:
Must I execute additional .jar/task in the synology to execute this example?

I have added the task

B4X:

nohup /var/packages/Java8/target/j2sdk-image/bin/java -jar volume1/web/webapp/HelloWorld/WebAppHelloWorld.jar > /volume1/web/webapp/HelloWorld/nohup.out

I am running another web Server in port 80/443
nohup.out is empty

I am also interested in this question. Is DSM multitasking? The nohup command, is it able to maintain alive 2 different programs?

B4J Question [SOLVED][Server] How I can compile/build HelloWorld example for Synology NAS?

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