Sanitize User Input to Prevent XML Injection

My application is written in Java and uses some XML code.

I am now looking into how to prevent XML Injection.

How do I validate or sanitize user input before incorporating it into an XML document or SOAP

Is it possible to block any input containing XML metacharacters such as < and >?

Can they be replaced with the corresponding entities: < and > somehow?

Can anyone point to example code that I could follow?
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Mark OlsenSr. DeveloperCommented:
You can use the Apache commons library "StringEscapeUtils" to escape the string.

example: (psuedo-code)

import org.apache.commons.lang.StringEscapeUtils;

String unescapedString = "This is < than that";

String escapedString = StringEscapeUtils.escapeXml(unescapedString);

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