Property ‘http://javax.xml.xmlconstants/property/accessexternaldtd’ is not recognized.

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Error Message:

The property ‘http://javax.xml.xmlconstants/property/accessexternaldtd‘ is not recognized.

Explanation:

The error message indicates that the property ‘http://javax.xml.xmlconstants/property/accessexternaldtd‘ is not recognized. This means that the specified property is either invalid or not supported by the XML parser you are using.

Example:

Let’s assume you are using the Java XML parser and attempting to set the ‘accessexternaldtd‘ property to control external DTD access. However, you mistakenly used the incorrect property value ‘http://javax.xml.xmlconstants/property/accessexternaldtd‘, which is not recognized by the parser. Here’s an example of how you might encounter this error: 


  import javax.xml.parsers.DocumentBuilderFactory;

  public class XMLParserExample {
      public static void main(String[] args) {
          try {
              DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
              factory.setFeature("http://javax.xml.xmlconstants/property/accessexternaldtd", true); // Setting the property
              // Rest of the code...
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  }

In the above example, if the property ‘http://javax.xml.xmlconstants/property/accessexternaldtd‘ is not recognized by the XML parser, it will throw an error similar to the one you encountered.

Solution:

To resolve this issue, you need to use the correct property value that is recognized by the XML parser you are working with. The correct value may vary depending on the parser implementation. Here’s an example of setting the ‘accessexternaldtd‘ property using the correct value for the Java XML parser: 


  import javax.xml.parsers.DocumentBuilderFactory;

  public class XMLParserExample {
      public static void main(String[] args) {
          try {
              DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
              factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", true); // Correct property value
              // Rest of the code...
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  }

In the above solution, we use the property ‘http://apache.org/xml/features/nonvalidating/load-external-dtd‘, which is the correct value recognized by the Java XML parser to control external DTD access. Make sure to consult the documentation of the specific XML parser you are using to find the correct property value for your case.

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