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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import org.apache.commons.codec.binary;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String message = "Test";
 
		int charCount = message.length() + 4;
		String hexInitiator = Integer.toHexString(charCount);
		String hexMessage = Hex.encodeHexString(message.getBytes());
 
		System.out.print(hexInitiator);
		System.out.print(hexMessage);
	}
}

Main.java:6: error: package org.apache.commons.codec does not exist
import org.apache.commons.codec.binary;
                               ^
Main.java:17: error: cannot find symbol
		String hexMessage = Hex.encodeHexString(message.getBytes());
		                    ^
  symbol:   variable Hex
  location: class Ideone
2 errors

Standard output is empty