decompiling and editing craftbukkit

Hello - I read that craftbukkit is an open source project and i wanted to change something in it in order to add another feature to my plugin easily.
How do I do that? Is there a tutorial?
I tried the github, but when i try to load it into eclipse i get a lot of missing types - what library should i add to the build path?
Thanks

 

Normally if you load it with maven it should download everything.

 

and how do i make Maven do that? (I have maven installed on eclipse already)

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EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Import a maven project and point it at where you downloaded the CB files.

 

CraftBukkit and Bukkit (There is a difference) both use Maven which is made by Apache Software. It is fairly simple to use and install and requires little to no work.

From The Command Line: (instead of downloading the zip you could clone the repo with git.
git clone git://github.com/bukkit/<repo name>.git)

Code:

1 - You need to download Maven at (http://maven.apache.org/download.html)
2 - Open the contents of the folder you have just downloaded and read the README
3 - Drag all contents of the zip folder to a place of your choice and add the bin directory of maven to your path (ex. the directory i have installed Maven is C:\Tools\Apache\Maven\, So the PATH that i add is "C:\Tools\Apache\Maven\bin\"
4 - In order for maven to work you also must need to have javajdk installed and have it added to your PATH, as well as a "JAVA_HOME" PATH which is just the directory that JavaJDK is installed.
5 - If you have not downloaded CraftBukkit or Bukkit from github do it now and cd into the directory that you have downloaded CraftBukkit or Bukkit.
6 - From the command line do "mv clean package" without quotes and it should download all necessary packages in order for you to build and run your modified version.
7 - Now you can edit like crazy from and IDE or text editor of your choice but in order to build CraftBukkit or Bukkit you must do "mv clean package" every time.

From Eclipse:

Code:

1 - You first need to install Maven & EGIT for Eclipse to do this go to "Help > Install New Software". Where it says work with select the drop down arrow then "All Available sites". Then where it says "Type filter text" type in "Maven" select both option then search for "Egit" you want to select both "Eclipse EGIT" and Eclipse EGIT Mylyn GitHub Feature" then click next twice and then accept the terms of the license agreement. You will need to restart Eclipse.
2 - Now you need to download the repository. to do this go to "File > Import > Git > Repositories from GitHub" then "File > Import > Maven > Existing Maven Projects" from there go to your Users folder (ex. C:\Users\Goblom\) once in there select the folder named "git" it will search for the main pom.xml file. Press select all then click finish. Now you chould have a new project named either craftbukkit or bukkit. After you click finish Eclipse will download everything needed to build that project.
3 - You can now edit and build CraftBukkit and/or Bukkit.

Hope That Helps

 

Goblom
It sure did, thanks! Just a quick question - how do i compile it correctly with the manifest file? Currently im getting errors about the main class (Kind of new to java generally, only done plugins and mini softwares so far)

 

Compile with maven, Megolas

 

mbaxter
There's no maven option in the export (Eclipse) - do I have to use the non-Eclipse maven?

 

Run maven separately from eclipse.

 

If you did everything exactly as i said earlier then all you need to do is select the project "Export > Java > Jar File"
If you have correctly edited craftbukkit or bukkit it should compile and export into a jar file ready to be run. If it does not compile please check your syntax and look for any errors, if you think you have done everything correctly but it still does not compile post the errors that you have here and i will help you fix them.

Also, Make sure you never used the "Tab" button. Java hates it and it will always produce errors. Use "Space" instead.


If you do prefer the command line which mbaxter has said to use all you need to do is cd into the directory and /mvn clean package

 

With a default eclipse install you cannot simply "export" craftbukkit. It won't run as it won't shade all the required dependencies.

Java doesn't care if you use tabs or spaces. At all. It's purely a programmer's choice (spaces are better!)

 

hmmm... learned something new. So everytime you want to build bukkit or craftbukkit you have to do it from the command line?

 

They do have a Maven plugin for Eclipse if you don't feel like running to the command line when you wish to compile.

 

Thanks, but i already solved this