Importing Apache poi in Intellij - java

This is my first time trying to use external libraries and I'm having trouble getting it to work. I tried following this tutorial and got to this step and as a result I got an empty library. If anyone could point out what I'm doing wrong that would be great.

easy way to manage Your externals libraries in Maven or Gradle. Use one of this and all Your problems will gone.

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How to properly add craftbukkit/spigot/paper as an external library in Eclipse?

I'm having issues including bukkit/spigot/paper into my Eclipse since when I try "extends JavaPlugin" in my Class it does not seem able to import the file
I have tried versions of craftbukkit, spigot and paper on several occasions but it just does not seem to work:
From all the online tutorials I have seen, I have noticed that on their versions of eclipse the "Modulepath" and "Classpath" headings do not seem to be there, but for me they are right there:
Could someone please tell me how to fix this issue?
I'm using Intellij IDEA and there is a plugin that create all the file on it, if you really want a clean environment use this to create your project and go back on eclipse after, i can create it and send you the main folder if you can provide you paper version that you want
You cannot use paper as a External JAR. Instead download Bukkit or Spigot from the internet (or use BuildTools to compile your own jar file), and use those instead of paper.

How to use Java Deep Library within Eclipse

I'm trying to install Java Deep Library. There seem to be about a million different ways to accomplish this. I am using the Eclipse IDE. Thus far I have tried to import the project using Gradle, however I am unfamiliar with Gradle and I do not know which folder to specify from the list of folders.
I have also tried adding Maven dependencies, but I do not know what any of this actually means and I don't know how to actually use them.
I've only just started using Java. I don't really understand how to get a Java project from github and start using it, which is why I'm having so much trouble.

java.lang.module.FindException: Unable to derive module descriptor for cucumber-core-7.3.4.jar

I initially created a plain Java project that followed the steps mentioned here and here but unfortunately, my project didn't work, I am getting this above error. I have not reached the step where it talks about integrating selenium.
Just to mention I used all the latest versions of the jar files as shown below.
I also got other various problems also, and to resolve them when I searched on the internet everyone was talking about the configuration inside the pom.xml file. But this file comes in the Maven project! so I converted my project to a Maven project. But that too didn't resolve my issues so I "disabled the Maven nature". No luck even after that.
currently, it is a Maven project but when I am following this step it is giving me the subject error.
This is how my package explorer look like:-
The trick is to start small with something working. And then after each change check if it still works. This will help you build an understanding of what each component and change does without overwhelming you.
Unfortunately you are following tutorials that do a whole lot at once. Try to break this down a bit. First learn about Maven, with plain Java and maybe a unit test. Then learn about how Eclipse works with Maven projects. Then use Cucumber with Maven, then add Selenium.
This may seem like a lot more work but it is faster because you'll only have to solve one problem at a time.
I don't have any tutorials for Maven or Eclipse but for Cucumber you use:
https://docs.cucumber.io/docs/guides/10-minute-tutorial/

Getting QueryDSL JAR files without Maven

Please excuse a newbie such as I for this silly question.
I am trying to install QueryDSL in my Java project in Eclipse Mars to use it for SQL querying. I do not use Maven yet, and don't know how to use it, though it's definitely on my to learn list.
The QueryDSL page points to their GitHub repository, but it's not clear to me how to add it to my project. Please advise on how can I get the full list of JAR files to add to my Eclipse Java project, without using Maven. Thanks!
Go to querydsl.com and click "Downloads" under "Documentation".

How do I download and build code of Eclipse IDE for Java?

Is there any manual on this? I can't find any.
What are necessary packages and where is their repo, what is the project structure and build process?
UPD the ultimate goal I'm trying to achieve is to debug Eclipse on Windows
Check these links
http://wiki.eclipse.org/Development_Resources
https://wiki.eclipse.org/Eclipse_Corner#Eclipse_Platform_Technical_Overview
https://wiki.eclipse.org/Platform_UI/How_to_Contribute#Setting_up_your_SDK
http://wiki.eclipse.org/Platform
There is a new tool called oomph Try this its easy to setup development environment. Check this video
Unable to comment so posting as answer
Please check this link should get you started
http://archive.eclipse.org/eclipse/downloads/drops/R-3.1.2-200601181600/srcIncludedBuildInstructions.html
I agree with the comment from #user3159253 . Cannot really understand the need to go through this trouble. Use RPM.

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