B4J Question Need Help Deploying B4J (jRDC2) on Ubuntu VPS – Not Starting Properly

[amarnath]

I’m trying to run a B4J server (jRDC2) on a Linux Managed Premium VPS with Ubuntu, but I haven’t been able to get it working after several attempts.

• VPS: Ubuntu 22.04 (16 CPU, 32GB RAM, 640GB SSD)

I’m not a Linux expert, so I’d really appreciate simple, step-by-step instructions that work on a managed Ubuntu VPS.

"Enhance Panel"
I’m ready to follow instructions precisely — I just need guidance that matches a non-Linux-expert using a managed VPS with a control panel.

 

[aeric]

Better remove your credentials.
To run the command, you need to use SSH client like Putty.

 

[Erel]

I've removed the credentials. I recommend you to replace the password.

I've updated the link for the java: https://www.b4x.com/android/forum/threads/server-run-a-server-on-a-vps.60378/#content

 

[teddybear]

I don't think you can deploy B4J (jRDC2) on Ubuntu VPS with a control panel.
As aeric said, you need to log on the vps via a terminal first and then deploy B4J (jRDC2) by running the command.

​

 

[aeric]

managed Ubuntu VPS

This means you get premium technical support from the hosting provider. I guess you can chat with them.
Even though I am using unmanaged VPS, they do provide chat bot and human support.

I’d really appreciate simple, step-by-step instructions

Even the hosting provides you a control panel, you still need to use the terminal to run some commands.
I guess there is a remote terminal run on browser but it is usually very slow.

Download:

WinSCP
I use WinSCP (FTP client) for transferring files between my desktop and the server.

Putty
You can install putty when installing WinSCP. You can click the icon (or Ctrl+P) to open putty.
I upload my server apps into /home directory.

 

[aeric]

Download JDK 21: https://www.oracle.com/java/technologies/downloads/#java21

Upload to: /usr/lib/jvm

Use putty, login as root.
cd to the /usr/lib/jvm directory.
unzip the archive file using tar command tar -xzf jdk-21_linux-x64_bin.tar.gz (you can type jdk then press tab for auto-complete)

If there is already existed an older version of JDK, type the following command to install a new version.
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-21.0.10/bin/java 100
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-21.0.10/bin/javac 100

Optional: Use the following command to configure the default version.
update-alternatives --config java

Check current default version:
java -version

Optional: Delete the tar.gz file

Upload the jar (and www folder if applicable)

Now you can run java server app using nohup as explained in this tutorial. (Rename result.jar as jrdc2.jar)
cd /home/jrdc2
nohup java -jar jrdc2.jar > nohup.out &

 

[amarnath]

This means you get premium technical support from the hosting provider. I guess you can chat with them.
Even though I am using unmanaged VPS, they do provide chat bot and human support.


Even the hosting provides you a control panel, you still need to use the terminal to run some commands.
I guess there is a remote terminal run on browser but it is usually very slow.

Download:

WinSCP
I use WinSCP (FTP client) for transferring files between my desktop and the server.

Putty
You can install putty when installing WinSCP. You can click the icon (or Ctrl+P) to open putty.
I upload my server apps into /home directory.

View attachment 169490

 

[aeric]

Are you sure the SSH/Linux username is your email, not "root" ?

 

[amarnath]

Are you sure the SSH/Linux username is your email, not "root" ?

 

[aeric]

View attachment 169497

I may be wrong but the username doesn't seem right.

Do you get email stated the SFTP login information (SFTP usually use port 22)? (not FTP with port 21)
How do you login to the control panel?
Which VPS provider is this?
Once you login to the dashboard you should found the SSH root password settings.
I think you should login using "root" and the SSH password in putty.

 

[amarnath]

 

[aeric]

View attachment 169499

View attachment 169500

View attachment 169501

Okay.
It seems this plan doesn't support SFTP.

Do you found the SSH settings any where in your dashboard panel or email?
If there is no SSH then this is probably not a VPS server.
It just a normal shared hosting.

 

[amarnath]

Okay. Do you found the SSH settings any where in your dashboard panel or email?

I’m not a expert. Please Help Me.

 

[aeric]

This is how a VPS dashboard panel should look like.
You should be able to choose to install an OS on a location and change the root access using SSH.
From what you have provided so far, you don't seem to login to a VPS.

 

[amarnath]

This is how a VPS dashboard panel should look like.
You should be able to choose to install an OS on a location and change the root access using SSH.
From what you have provided so far, you don't seem to login to a VPS.

View attachment 169505

I’m not an expert in Linux or server management, and I’m having trouble setting up my B4J jRDC2 server on my Ubuntu VPS.

I would really appreciate your guidance.


I am not an expert. Please help me.
I’m willing to provide my VPS login details (IP, username, and password) so you can set up the B4J server for me.
Could you please share your email address?

 

[aeric]

I’m having trouble setting up my B4J jRDC2 server on my Ubuntu VPS

You should be able to choose to install an OS on a location and change the root access using SSH.
From what you have provided so far, you don't seem to login to a VPS.

You need to get a real VPS plan.

 

[amarnath]

You need to get a real VPS plan.

Which is the best plan for VPS.
which Operating System (plain OS or OS with panel)
E.g. cPanel,

​

 

[aeric]

Which is the best plan for VPS.

Depends on your location.
I recommend hostinger which has servers available in many countries.
I only get the cheapest VPS with 1 vCPU and 4GB RAM. It is sufficient to run several B4J server apps.
I can post a referral link if you are interested.

 

[amarnath]

Depends on your location.
I recommend hostinger which has servers available in many countries.
I only get the cheapest VPS with 1 vCPU and 4GB RAM. It is sufficient to run several B4J server apps.
I can post a referral link if you are interested.

please send referral link

 

[aeric]

You can sign up using my referral link so I can also earn some credits while you can enjoy 20% discount:
https://hostinger.my?REFERRALCODE=C2CAERIC8GAF