Replace XMLReaderFactory with SAXParserFactory #27239
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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
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Sorry I should've replaced it outside spring-web as well. UPDATE Pushed. |
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@Frederick888 thanks for the PR and sorry it took so long to process it. With |
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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 See gh-27239
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XMLReaderFactory has been marked as deprecated and without additional
configuration, and it's slower than SAXParserFactory.
Previously
XMLReaderFactory.createXMLReader()is called upon everyrequest. 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
Related: #19055
Upstream discussion: https://mail.openjdk.java.net/pipermail/jdk-dev/2021-August/005853.html