How to Fix java.net.MalformedURLException: No Protocol Error in Java

1. the java.net.MalformedURLException: no protocol Error in Java
2. Fix the java.net.MalformedURLException: no protocol Error

We are going to look into the error java.net.MalformedURLException: no protocol in Java. Why does it occur, and how we can solve the error.

the java.net.MalformedURLException: no protocol Error in Java

This java.net.MalformedURLException: no protocol occurs when there’s an issue with our URL. This is client-server programming; by giving a request, we receive the response.

The request would be the URL that we will use to establish the connection between the client and the server. If the URL used is not working properly or not correctly used in the string, then we will receive the java.net.MalformedURLException: no protocol error.

Fix the java.net.MalformedURLException: no protocol Error

Sometimes, the programmer does not understand how to implement this client-server relation. Hence, this error is shown.

This error occurs only in two cases. The first case is when the user uses the string directly to parse by declaring it, and the second case is when the URL used is not correct.

In the second case, the incorrect URL can be easily resolved by correcting it. In the first case, we have to use the source of the string text and use it as a URL or use a method like StringReader.

We will only use the StringReader to properly implement and establish the connection. The StringReader is a Reader that reads the string as it is.

Let’s have a code example that will return the java.net.MalformedURLException: no protocol error.

Code:

DocumentBuilderFactory DbuilderFac = DocumentBuilderFactory.newInstance();
DocumentBuilder Dbuilder = DbuilderFac.newDocumentBuilder();
String xml =
    "/paste your XML here" Dbuilder.parse(xml); // we can's pass a direct XML string in it, because
                                                // this particular function takes URL as input

As mentioned above, we must use the StringReader() to fix the error. Take a look at the following code.

Code:

DocumentBuilderFactory DbuilderFac = DocumentBuilderFactory.newInstance();
DocumentBuilder Dbuilder = DbuilderFac.newDocumentBuilder();
String xml = "/paste your XML here" Dbuilder.parse(
    new InputSource(new StringReader(xml))); // StringReader() is being used here

All you need to do is to use the InputSource and the StringReader to resolve the java.net.MalformedURLException: no protocol error.