How to Load a class file base on .class file name???

Question

Hi,
Can anyone help me?
1) Based on filename (d:\temp\bla.class), I want to load this bla.class and get the actual package of this class.
example:
package something.temp;
public class bla
I want to load the file base on filename and get the package of the class. Is it possible ?
Thank you.

Answer 1

Hi nikki96,
It will not work. I will get java.lang.NoClassDefFoundError eventhough I extends classloader to use the findClass(String filename);
Example:
import java.security.*;
import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
import sun.misc.Resource;
import sun.misc.URLClassPath;
public class MyURLClassLoader extends ClassLoader
String host;
int port;
public Class findClass(String name)
               try
     byte[] b = loadClassData(name);
     return defineClass(name, b, 0, b.length);
               } catch(Exception e)
                    e.printStackTrace();
               return null;
private byte[] loadClassData(String name) throws Exception
               // load the class data from the connection
               File file = new File(name);
               InputStream is = new FileInputStream(file);
               long length = file.length();
               // You cannot create an array using a long type.
               // It needs to be an int type.
               // Before converting to an int type, check
               // to ensure that file is not larger than Integer.MAX_VALUE.
               if (length > Integer.MAX_VALUE) {
                    // File is too large
               // Create the byte array to hold the data
               byte[] bytes = new byte[(int)length];
               // Read in the bytes
               int offset = 0;
               int numRead = 0;
               while (offset < bytes.length
                    && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
                    offset += numRead;
               // Ensure all the bytes have been read in
               if (offset < bytes.length) {
                    throw new IOException("Could not completely read file "+file.getName());
               // Close the input stream and return bytes
               is.close();
               return bytes;
Problem: The class file is not in the proper package (d:\temp\bla.class) where the proper package is d:\something\temp\bla.class.
Objective: I just want to base on the bla.class (no matter where is it located), then get the package of the classfile (bla.class) like example something.temp.
Simple as that but I don't know how to do :(.