Use of non-Stax2-compatible Stax2 implementation fails when reading from `byte[]`

[cowtowncoder]

(note: inspired by #481)

Looks like there is one error mode when using JDK-bundled Stax implementation -- or more generally, anything that does not implement Stax2 extensions. Exception when reading from byte[] looks something like this:

java.lang.UnsupportedOperationException: Cannot create XMLStreamReader or XMLEventReader from a org.codehaus.stax2.io.Stax2ByteArraySource
	at com.sun.xml.stream.ZephyrParserFactory.jaxpSourcetoXMLInputSource(ZephyrParserFactory.java:304)
	at com.sun.xml.stream.ZephyrParserFactory.createXMLStreamReader(ZephyrParserFactory.java:151)
	at com.fasterxml.jackson.dataformat.xml.XmlFactory._createParser(XmlFactory.java:631)
	at com.fasterxml.jackson.dataformat.xml.XmlFactory._createParser(XmlFactory.java:1)
	at com.fasterxml.jackson.core.JsonFactory.createParser(JsonFactory.java:1122)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3636)	

It should be relatively easy to work around the issue, to provide input source non-Stax2 implementations can use instead.

[timja]

Thanks!

I verified this fixed our test (I cherry-picked the fix into 2.12):

https://github.com/jenkinsci/jackson2-api-plugin/blob/master/src/test/java/com/fasterxml/jackson/dataformat/xml/XmlMapperTest.java

cc @jglick @basil

diff --git a/pom.xml b/pom.xml
index 4eba2d1..500be94 100644
--- a/pom.xml
+++ b/pom.xml
@@ -67,7 +67,7 @@
     <revision>2.12.4</revision>
     <changelist>-SNAPSHOT</changelist>
     <java.level>8</java.level>
-    <jenkins.version>2.222.4</jenkins.version>
+    <jenkins.version>2.300</jenkins.version>
     <jackson.version>2.12.3</jackson.version>
     <jackson-databind.version>${jackson.version}</jackson-databind.version>
   </properties>
@@ -149,7 +149,7 @@
     <dependency>
       <groupId>com.fasterxml.jackson.dataformat</groupId>
       <artifactId>jackson-dataformat-xml</artifactId>
-      <version>${jackson.version}</version>
+      <version>2.12.4-SNAPSHOT</version>
     </dependency>

     <dependency>
diff --git a/src/test/java/com/fasterxml/jackson/dataformat/xml/XmlMapperTest.java b/src/test/java/com/fasterxml/jackson/dataformat/xml/XmlMapperTest.java
index a864ecd..825d5a4 100644
--- a/src/test/java/com/fasterxml/jackson/dataformat/xml/XmlMapperTest.java
+++ b/src/test/java/com/fasterxml/jackson/dataformat/xml/XmlMapperTest.java
@@ -10,8 +10,6 @@ import org.jvnet.hudson.test.RealJenkinsRule;

 import java.nio.charset.StandardCharsets;

-import javax.xml.stream.XMLInputFactory;
-
 public class XmlMapperTest {

     @Rule public RealJenkinsRule rr = new RealJenkinsRule();
@@ -22,11 +20,7 @@ public class XmlMapperTest {
     }

     private static void _smokes(JenkinsRule r) throws Throwable {
-        XMLInputFactory inputFactory =
-                XMLInputFactory.newFactory(
-                        XMLInputFactory.class.getName(), XmlFactory.class.getClassLoader());
-        XmlFactory factory = new XmlFactory(inputFactory);
-        XmlMapper mapper = new XmlMapper(factory);
+        XmlMapper mapper = new XmlMapper();
         String content = "<foo><bar><id>123</id></bar></foo>";
         Foo foo = mapper.readValue(content.getBytes(StandardCharsets.UTF_8), Foo.class);
         assertNotNull(foo.getBar());