Validating schema java

Let’s first look at a simple example validating “Hello, World” using a JSON schema.

The data that we want to validate is: “Hello, World” This schema will do the job: This schema invalidates all strings shorter than 12 characters and longer than 12 characters (there are 12 characters in the data set).

In this tutorial we look at how to use the SAXBuilder that validates against an XSD.

The example below shows how to use an internally defined XSD.

In fact, if you have ever written an XML schema, then JSON schema should be quite familiar to you. At Constant Contact we are mostly a Java shop, and the validator from Francis Galliegue (aka fge) works quite well for us.

It is popular with Java developers, and is available on Git Hub here.

In the earlier tutorials we saw how to build a JDOM2 document using SAXBuilder. Now lets look at an example that shows how to specify an XSD externally.

Activating validation allows the application to tell whether the XML document contains the right tags or whether those tags are in the right sequence.

Validating input is one of those programming necessities that we sometimes like to put off.

In fact it is much easier to take on faith that the input is correct than to spend many lines-of-code trying to guard against all the ways the input can be wrong.

There are several excellent tutorials available to get you more acquainted with these concepts.

A good starting point is the excellent guide given here: Principal Software Engineer @Constant Contact.

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