What is module-info and how to use it? Does it affect referenced libraries?

Question

I have just upgraded to newest Eclipse and met some trouble.

I want to use jSSC library in my project and perhaps I am doing something wrong. At first, I am setting classpath choosing "Add External Libraries";

Then I click Finish and Eclipse asks me for the module name (I have never met it before). Question 1: What is it about? What should be proper name here? Anyway, I type something and proceed with "Create".

Then I want to create Main class. This is how project looks like:

I am using sample code from: https://code.google.com/archive/p/java-simple-serial-connector/wikis/jSSC_Start_Working.wiki

As you can suspect, there is import error in both files...

The import jssc cannot be resolved

Question 2: What is causing the error? Why can't I import from the referenced library?

Question 3: Where should be module-info stored?

The module-info code:

/**
 * 
 */
/**
 * @author username
 *
 */
module somemodule {
}

Question 4: What should I put here? @Edit: After marking my question as possible duplicate. I have tried to add

requires jssc;

in module-info. Didn't work and now I have one more error;

The type java.lang.Object cannot be resolved. It is indirectly 
referenced from required .class files

@Edit: I tried with Java 8 and everything is fine. There is no module-info.