cellular iot fundamentals - lesson 5 / exercise 1

RE: cellular iot fundamentals - lesson 5 / exercise 1

Priyanka — Fri, 13 Mar 2026 13:05:06 GMT

Hi Vivek,

This error could be because you are either in the wrong folder, or you are entering something wrong.

In your folder, is the file named cf-browser-3.6.0.jar ?

And you are opening the cmd window in the correct folder?

Also, could you tell me what you type into the cmd window?

what do you see when you type dir?

What do you see when you type java -version ?

-Priyanka

RE: cellular iot fundamentals - lesson 5 / exercise 1

Vivek01 — Wed, 11 Mar 2026 22:50:45 GMT

hi,

i install the JAVA 8 JDK and run this command in cmd but i got this Error: Could not find or load main class org.eclipse.californium.tools.GUIClientFX.

thanks

RE: cellular iot fundamentals - lesson 5 / exercise 1

Priyanka — Tue, 10 Mar 2026 12:48:06 GMT

Hi Vivek,

Apologies for the delay.

[quote user=""] but i can't open a cf-browser file on java(TM) platform SE binary (javaw)[/quote]

If you use different versions of java and javaFX, this can result in an error. I think newer versions of JAVA doesn't include JavaFX and maybe this might be the reason.

Could you make sure that you download and install the JAVA 8 JDK?

Then, go to the location where you cf browser was downloaded to, and open a terminal there, and try:

java -jar cf-browser-3.6.0.jar

-Priyanka