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Replace XMLReaderFactory with SAXParserFactory #27239

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Frederick888 wants to merge 2 commits into spring-projects:main from Frederick888:migrate-xml-reader

Commits on Aug 4, 2021

Replace XMLReaderFactory with SAXParserFactory

XMLReaderFactory has been marked as deprecated and without additional
configuration, and it's slower than SAXParserFactory.

Previously `XMLReaderFactory.createXMLReader()` is called upon every
request. This is an anti-pattern as mentioned in [1] and it can be very
slow since it loads the jar service file unless a parser has been
pre-assigned [2] (e.g. by setting org.xml.sax.driver).

SAXParserFactory uses a FactoryFinder [3] instead, which takes advantage
of a thread-local cache provided by ServiceLoader. Developers can still
pre-assign a factory by setting javax.xml.parsers.SAXParserFactory to
make it faster.

[1] https://bugs.openjdk.java.net/browse/JDK-6925410
[2] https://github.com/openjdk/jdk/blob/c8add223a10030e40ccef42e081fd0d8f00e0593/src/java.xml/share/classes/org/xml/sax/helpers/XMLReaderFactory.java#L144-L148
[3] https://github.com/openjdk/jdk/blob/66c653c561b3b5e904579af62e23ff94952bca05/src/java.xml/share/classes/javax/xml/parsers/SAXParserFactory.java#L181-L185

Frederick888 committed Aug 4, 2021

Replace XMLReaderFactory globally

Frederick888 committed Aug 4, 2021
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