Add JDK 17 test functionality (#672)

pom.xml

@@ -202,4 +202,58 @@ alternative support for serializing POJOs as XML and deserializing XML as pojos.
     </repository>
   </repositories>
 
+  <profiles>
+    <profile>
+      <!-- And different set up for JDK 17 -->
+      <id>java17</id>
+      <activation>
+        <jdk>17</jdk>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>build-helper-maven-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>add-test-source</id>
+                <phase>generate-test-sources</phase>
+                <goals>
+                  <goal>add-test-source</goal>
+                </goals>
+                <configuration>
+                  <sources>
+                    <source>src/test-jdk17/java</source>
+                  </sources>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-compiler-plugin</artifactId>
+            <inherited>true</inherited>
+            <configuration>
+              <!-- Enable Java 17 for all sources so that Intellij picks the right language level -->
+              <source>17</source>
+              <release>17</release>
+              <compilerArgs>
+                <arg>-parameters</arg>
+                <arg>--add-opens=java.base/java.lang=ALL-UNNAMED</arg>
+                <arg>--add-opens=java.base/java.util=ALL-UNNAMED</arg>
+              </compilerArgs>
+            </configuration>
+          </plugin>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <configuration>
+              <argLine>--add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED</argLine>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
 </project>

src/test-jdk17/java/com/fasterxml/jackson/dataformat/xml/jdk17/Java17CollectionsTest.java

@@ -0,0 +1,32 @@
+package com.fasterxml.jackson.dataformat.xml.jdk17;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import com.fasterxml.jackson.dataformat.xml.XmlTestBase;
+
+public class Java17CollectionsTest extends XmlTestBase
+{
+
+    private final XmlMapper _xmlMapper = new XmlMapper();
+
+    public void testStreamOf()
+            throws Exception
+    {
+        List<String> input = Stream.of("a", "b", "c").collect(Collectors.toList());
+
+        String ser = _xmlMapper.writeValueAsString(input);
+        assertEquals("<ArrayList><item>a</item><item>b</item><item>c</item></ArrayList>", ser);
+
+        List<?> deser = _xmlMapper.readValue(ser, List.class);
+        assertEquals(input, deser);
+
+        input = Stream.of("a", "b", "c").toList();
+        ser = _xmlMapper.writeValueAsString(input);
+        deser = _xmlMapper.readValue(ser, List.class);
+        assertEquals(input, deser);
+    }
+
+}