How can I ignore DTD references when parsing XML files with DocumentBuilder.parse?

Ignoring DTD References with DocumentBuilder.parse

When parsing XML files with references to external DTDs (Document Type Declarations), an error may occur if the DTD is not available or is inaccessible. To overcome this issue and ignore DTD references during parsing, set various features on the DocumentBuilderFactory:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

dbf.setValidating(false);
dbf.setNamespaceAware(true);
dbf.setFeature("http://xml.org/sax/features/namespaces", false);
dbf.setFeature("http://xml.org/sax/features/validation", false);
dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-dtd-grammar", false);
dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);

DocumentBuilder db = dbf.newDocumentBuilder();

With these features disabled, the DocumentBuilder will ignore DTD references and proceed with parsing the XML.

Specific feature options may vary depending on the parser implementation. For example, the Xerces2 parser documentation provides additional insights into disabling DTD loading and validation. By setting these features, you can parse XML files without the need for external DTDs, ensuring that processing errors are minimized.

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