Runtime error showing in running .wav audio

import java.awt.event.*;
import javax.swing.*;
import javax.sound.sampled.*;
import java.net.URL;
import java.io.*;

class SoundTest
{
	public static void main(String[] args) throws Exception
	{
		URL file = new URL("file:C:/Users/a/Documents/My/baby.wav");

		AudioInputStream ais = AudioSystem.getAudioInputStream(file);
		Clip clip = AudioSystem.getClip();
		clip.open(ais);

		JButton button = new JButton("Play Clip");
		button.addActionListener( new ActionListener()
		{
			@Override
			public void actionPerformed(ActionEvent ae)
			{
				clip.setFramePosition(0);
				clip.start();
			}
		});

		JOptionPane.showMessageDialog(null, button);
	}
}

I'm trying this code but when I am trying to run it is showing error -

javax.sound.sampled.UnsupportedAudioFileException:
    could not get audio input stream from input URL (in javax.sound.sampled.AudioSystem) 

Please anyone solve my problem

It seems most likely that one (or both!) of two things could be happening. One is that the addressing of the file is not working. The other is that the file is a format that Java does not support.

I'd put a request for info in the comments but things are getting quite cluttered there!

Can you tell us the format of the wav file? Try checking it's properties. For sure, Java will support 16-bit, 44100 fps, mono or stereo, little endian, which is the most common format. You can check properties using Audacity if the properties from your OS are incomplete. There are a lot more files these days that are 24-bit or 32-bit, or 48000fps or even 92000fps, and Java doesn't support them yet, afaik.

A "safe" test sound would be this thunder clap at Freesound.org. You can see on the specs on the right side of the page it's 16-bit, 44100 fps stereo. I would download it and add it to your program rather than trying to play it from its web location.

To help test if the addressing is a problem, I would put the sound in the same folder as your SoundTest.java file. Then, use the following line to get the file's URL.

URL url = this.getClass().getResource("soundfilename.wav");

This will search in the project folder for the resource. There are other addressing modes for different purposes, but this should help with getting the basic code working. Having your program read directly from a disc location, if truly needed, can be worked out after verifying that you have a working sound file.

The string for the URL you're inputting is incorrect, try this instead:

C:\\Users\\a\\Documents\\My\\baby.wav

I also recommend reading files form a resources folder instead of from anywhere on your system, this blog post does a decent job explaining resources.

If you would like an easier way to access different files, I see that you're using the Swing library so consider using the JFileChooser component.

Edit: Changed URL path