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new 13dac20283ce [SPARK-57540][SQL] Instantiate Woodstox
`WstxOutputFactory` directly in `StaxXmlGenerator`
13dac20283ce is described below
commit 13dac20283ce7b0c682ed954f908cc3e725a69bb
Author: Tian Gao <[email protected]>
AuthorDate: Mon Jun 22 13:11:22 2026 -0700
[SPARK-57540][SQL] Instantiate Woodstox `WstxOutputFactory` directly in
`StaxXmlGenerator`
### What changes were proposed in this pull request?
In `StaxXmlGenerator`, the StAX `XMLOutputFactory` was obtained via
`XMLOutputFactory.newInstance()` and then configured with Woodstox-specific
properties from the shaded Hadoop Woodstox
(`org.apache.hadoop.shaded.com.ctc.wstx.api.WstxOutputProperties`).
This PR constructs the shaded Woodstox factory directly:
```scala
val factory = new
org.apache.hadoop.shaded.com.ctc.wstx.stax.WstxOutputFactory()
```
instead of relying on `XMLOutputFactory.newInstance()`.
### Why are the changes needed?
`XMLOutputFactory.newInstance()` resolves a concrete StAX implementation
through the JAXP/service-loader lookup. If any other (unshaded) StAX provider
happens to be on the classpath, it can win that lookup and return a factory
that is **not** the shaded Woodstox. That factory does not understand the
shaded `WstxOutputProperties.P_OUTPUT_VALIDATE_STRUCTURE` /
`P_OUTPUT_VALIDATE_NAMES` keys set immediately afterwards, and Woodstox/StAX
throws `IllegalArgumentException` for unknown prope [...]
By instantiating the shaded `WstxOutputFactory` directly, the factory
implementation and the property keys are guaranteed to come from the same
shaded Woodstox, eliminating the potential conflict regardless of what else is
on the classpath.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Existing `to_xml` / XML write tests in `XmlSuite` cover this code path. No
behavior change is expected; the factory used is the same shaded Woodstox that
the configured properties already targeted.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Opus 4.8)
Closes #56600 from gaogaotiantian/SPARK-wstx-output-factory.
Authored-by: Tian Gao <[email protected]>
Signed-off-by: Tian Gao <[email protected]>
---
.../org/apache/spark/sql/catalyst/xml/StaxXmlGenerator.scala | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/xml/StaxXmlGenerator.scala
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/xml/StaxXmlGenerator.scala
index 2a08a2e4d4b5..6e381a2974c7 100644
---
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/xml/StaxXmlGenerator.scala
+++
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/xml/StaxXmlGenerator.scala
@@ -19,11 +19,11 @@ package org.apache.spark.sql.catalyst.xml
import java.io.Writer
import java.sql.Timestamp
import java.util.Base64
-import javax.xml.stream.XMLOutputFactory
import scala.collection.Map
import org.apache.hadoop.shaded.com.ctc.wstx.api.WstxOutputProperties
+import org.apache.hadoop.shaded.com.ctc.wstx.stax.WstxOutputFactory
import org.apache.spark.SparkIllegalArgumentException
import org.apache.spark.sql.catalyst.InternalRow
@@ -72,7 +72,13 @@ class StaxXmlGenerator(
private val binaryFormatter = ToStringBase.getBinaryFormatter
private val gen = {
- val factory = XMLOutputFactory.newInstance()
+ // Instantiate the Woodstox factory directly from the shaded Hadoop
classes instead of
+ // using XMLOutputFactory.newInstance(). The latter resolves an
implementation via the
+ // service-loader mechanism, which could pick up a different (unshaded)
StAX provider on the
+ // classpath. Such a provider would not understand the shaded
WstxOutputProperties keys set
+ // below and would throw IllegalArgumentException. Constructing the shaded
factory directly
+ // guarantees the properties and the implementation always match.
+ val factory = new WstxOutputFactory()
// to_xml disables structure validation to allow multiple root tags
factory.setProperty(WstxOutputProperties.P_OUTPUT_VALIDATE_STRUCTURE,
validateStructure)
factory.setProperty(WstxOutputProperties.P_OUTPUT_VALIDATE_NAMES,
options.validateName)
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