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From: eitch (@eitch) <[email protected]>
To: pgjdbc/pgjdbc <[email protected]>
Subject: Re: [pgjdbc/pgjdbc] issue #3221: Performance degradation of XML operations under Java 21 with custom parsers/transformers
Date: Tue, 29 Jul 2025 13:23:10 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

I'm running into a similar issue, as it seems a client has issues with their infrastructure where these frequent reloads leads to slow transactions. I've now tried to add a customer factory but i am running into a bug where it says my implementation is not implementing the interface. This is my class:

```java

import org.postgresql.xml.EmptyStringEntityResolver;
import org.postgresql.xml.NullErrorHandler;
import org.postgresql.xml.PGXmlFactoryFactory;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXTransformerFactory;

public class CachingPGXmlFactoryFactory implements PGXmlFactoryFactory {

	@Override
	public DocumentBuilder newDocumentBuilder() throws ParserConfigurationException {
		return this.documentBuilder;
	}

	@Override
	public TransformerFactory newTransformerFactory() {
		return this.transformerFactory;
	}

	@Override
	public SAXTransformerFactory newSAXTransformerFactory() {
		return this.saxTransformerFactory;
	}

	@Override
	public XMLInputFactory newXMLInputFactory() {
		return this.xmlInputFactory;
	}

	@Override
	public XMLOutputFactory newXMLOutputFactory() {
		return this.xmlOutputFactory;
	}

	@Override
	public XMLReader createXMLReader() throws SAXException {
		return this.xmlReader;
	}
}
```

and i get the following exception when using the class:
```
Connection property xmlFactoryFactory must implement PGXmlFactoryFactory: li.strolch.persistence.postgresql.CachingPGXmlFactoryFactory
```

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  To: github://pgjdbc/pgjdbc
  Cc: [email protected], [email protected]
  Subject: Re: [pgjdbc/pgjdbc] issue #3221: Performance degradation of XML operations under Java 21 with custom parsers/transformers
  In-Reply-To: <<[email protected]>>

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