Hi, im playing round with a dead mod someone has asked to come back, and it has over 80 items to add, i cant be bothered defining all of them in the useual way so im writing a method that gets all the classes within a directory, the items directory and initializes them for me, GameRegistry and all.

 

now i am new to classloader, i did it in a test project like so:

 

/**** SampleClass.class ****/
private int numberz;
public SampleClass(int number)
{
    numberz = number;
}
public get()
{
    return numberz;
}

/**** Main Class ****/
File file = (ClassLoader.getSystemResource("test").getPath()); //the package
File[] files = file.listFiles();
for(File  : files)
    System.out.println(f.getName().replace(".class",""));
Class<?> claz = Class.forName("test.SampleClass"); 
Constructor<?> constr = claz.getConstructor(int.class);
Object object = constr.newInstance(5);
System.out.println(((SampleClass)object).get());

/**** Console ****/
file:/C:/****/eclipse/test/bin/test
App
SampleClass
5

 

so as you can see, it worked perfectly in that example. however when i applied it to the mod, it gets stuck on ClassLoader.getResource(classPath);

the exception is NullPointerException, but when i run it in debug mode, it clearly does get passed the directory of the item classes:

 

 

 

EDIT:

i found that i have to use FML's class loader, didnt realise there was more than one, its called: "LaunchClassLoader" and i did this:

 

private String[] searchClasspath(String classPath)
{ 
	URL url = LaunchClassLoader.getSystemResource(classPath);
	String path = url.getPath();
	File file = new File(path); 
	File[] files = file.listFiles();
	String[] names= new String[files.length];
	for(int i = 0; i<files.length; i++)
		names[i] = classPath+"."+(files[i].getName().replace(".class", ""));
	return names;
}

 

when it passes Url url = *

url is null, it didnt get anything, the class path i gave it is right, does any one know what im doing wrong, help would be apreciated.

i found an event i thought i could use, FMLConstructionEvent.

but when i use it, all the urls in it, get resource("") : Enumeration<URL>, geturls : URL[], findResource() : URL

all return null.

i found an event i thought i could use, FMLConstructionEvent.

but when i use it, all the urls in it, get resource("") : Enumeration<URL>, geturls : URL[], findResource() : URL

all return null.

 

For what you are trying to do, I don't think you need a classloader.

Curiosity, aswell as there being 80+ item classes, and initializing & registering them all is a pain, be even more of a pain when the next version comes round, the idea of this is to setup the item classes so they setup themselves (this.setunlololizedname();this.setTexture();this.setCreativeTab()), put them all in one package, get all the files within that package, build a class from each of them  and initialize/register them all in a loop, then add them to a hashmap, the key being the unlocolized name.

 

this means i can also easily use it in other mods aswell.

Or, you could write a small java program to automatically generate a text file containing the appropriate source code for registering all the items, then add that source code to your project.  Probably a lot faster...

 

-TGG

i dont think making a seperate program like that would be quicker.

 

and i got it working. it was only like 30 odd lines for code to do it, but works fune now.

 

thanks for then help.