Fix #482 (related to #481 and #480) for 2.12(.4)

Author: cowtowncoder

pom.xml

@@ -109,6 +109,15 @@ alternative support for serializing POJOs as XML and deserializing XML as pojos.
       <version>2.3.2</version>
       <scope>test</scope>
     </dependency>
+    <!-- 03-Jul-2021, tatu: For sanity checking of non-Woodstox impl usage
+        need, say, Sjsxp
+      -->
+    <dependency>
+      <groupId>com.sun.xml.stream</groupId>
+      <artifactId>sjsxp</artifactId>
+      <version>1.0.2</version>
+      <scope>test</scope>
+    </dependency>
 
     <dependency>
       <groupId>junit</groupId>

release-notes/CREDITS-2.x

@@ -155,3 +155,8 @@ Westin Miller (westinrm@github)
 
 * Contributed #456: Fix JsonAlias with unwrapped lists
  (2.12.3)
+
+Tim Jacomb (timja@github)
+
+* Reported #482: Use of non-Stax2-compatible Stax2 implementation fails when reading
+ (2.12.4)

release-notes/VERSION-2.x

@@ -11,6 +11,9 @@ Project: jackson-dataformat-xml
 #473: Parsing of `null` Integer fields changed behavior between versions
    2.11.4 and 2.12.X
  (reported by Steviep@github)
+#482: Use of non-Stax2-compatible Stax2 implementation fails when reading
+  from byte[]
+ (reported by Tim J)
 
 2.12.3 (12-Apr-2021)
 

src/main/java/com/fasterxml/jackson/dataformat/xml/XmlFactory.java

@@ -4,6 +4,7 @@
 
 import javax.xml.stream.*;
 
+import org.codehaus.stax2.XMLInputFactory2;
 import org.codehaus.stax2.io.Stax2ByteArraySource;
 import org.codehaus.stax2.io.Stax2CharArraySource;
 
@@ -610,7 +611,13 @@ protected FromXmlParser _createParser(char[] data, int offset, int len, IOContex
         //    is always same as if 'false' was passed
         XMLStreamReader sr;
         try {
-            sr = _xmlInputFactory.createXMLStreamReader(new Stax2CharArraySource(data, offset, len));
+            // 03-Jul-2021, tatu: [dataformat-xml#482] non-Stax2 impls unlikely to
+            //    support so avoid:
+            if (_xmlInputFactory instanceof XMLInputFactory2) {
+                sr = _xmlInputFactory.createXMLStreamReader(new Stax2CharArraySource(data, offset, len));
+            } else {
+                sr = _xmlInputFactory.createXMLStreamReader(new CharArrayReader(data, offset, len));
+            }
         } catch (XMLStreamException e) {
             return StaxUtil.throwAsParseException(e, null);
         }
@@ -628,7 +635,13 @@ protected FromXmlParser _createParser(byte[] data, int offset, int len, IOContex
     {
         XMLStreamReader sr;
         try {
-            sr = _xmlInputFactory.createXMLStreamReader(new Stax2ByteArraySource(data, offset, len));
+            // 03-Jul-2021, tatu: [dataformat-xml#482] non-Stax2 impls unlikely to
+            //    support so avoid:
+            if (_xmlInputFactory instanceof XMLInputFactory2) {
+                sr = _xmlInputFactory.createXMLStreamReader(new Stax2ByteArraySource(data, offset, len));
+            } else {
+                sr = _xmlInputFactory.createXMLStreamReader(new ByteArrayInputStream(data, offset, len));
+            }
         } catch (XMLStreamException e) {
             return StaxUtil.throwAsParseException(e, null);
         }

src/test/java/com/fasterxml/jackson/dataformat/xml/interop/NonWoodstoxStaxImpl482Test.java

@@ -0,0 +1,49 @@
+package com.fasterxml.jackson.dataformat.xml.interop;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.ObjectReader;
+import com.fasterxml.jackson.dataformat.xml.XmlFactory;
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import com.fasterxml.jackson.dataformat.xml.XmlTestBase;
+import com.sun.xml.stream.ZephyrParserFactory;
+import com.sun.xml.stream.ZephyrWriterFactory;
+
+// to verify issue behind [dataformat-xml#482]
+public class NonWoodstoxStaxImpl482Test extends XmlTestBase
+{
+    static class Root {
+        public int value = 3;
+    }
+
+    private final XmlMapper SJSXP_MAPPER = XmlMapper.builder(
+            XmlFactory.builder()
+                .inputFactory(new ZephyrParserFactory())
+                .outputFactory(new ZephyrWriterFactory())
+            .build())
+            .build();
+ 
+    // [dataformat-xml#482]
+    public void testSjsxpFromByteArray() throws Exception
+    {
+        byte[] xml0 = SJSXP_MAPPER.writeValueAsBytes(new Root());
+        // and just for fun, ensure offset handling works:
+        byte[] xml = new byte[xml0.length + 10];
+        System.arraycopy(xml0, 0, xml, 5, xml0.length);
+        Root result = SJSXP_MAPPER.readValue(xml, 5, xml0.length, Root.class);
+        assertNotNull(result);
+    }
+
+    // [dataformat-xml#482]
+    public void testSjsxpFromCharArray() throws Exception
+    {
+        char[] xml0 = SJSXP_MAPPER.writeValueAsString(new Root()).toCharArray();
+        // add offset
+        char[] xml = new char[xml0.length + 10];
+        System.arraycopy(xml0, 0, xml, 5, xml0.length);
+        ObjectReader r = SJSXP_MAPPER.readerFor(Root.class);
+        JsonParser p = r.createParser(xml, 5, xml0.length);
+        Root result =  r.readValue(p);
+        p.close();
+        assertNotNull(result);
+    }
+}