[Java Jersey3] fix missing dependency for java jersey3 withXml option

modules/openapi-generator/src/main/resources/Java/libraries/jersey3/pom.mustache

@@ -359,6 +359,21 @@
             <artifactId>jersey-media-jaxb</artifactId>
             <version>${jersey-version}</version>
         </dependency>
+        {{^useJackson3}}
+        <dependency>
+            <groupId>com.fasterxml.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>${jackson-version}</version>
+        </dependency>
+        {{/useJackson3}}
+        {{#useJackson3}}
+        <!-- TODO: adjust model template to fix compilation errors for jackson3 in combination with xml support -->
+        <dependency>
+            <groupId>tools.jackson.dataformat</groupId>
+            <artifactId>jackson-dataformat-xml</artifactId>
+            <version>${jackson3-version}</version>
+        </dependency>
+        {{/useJackson3}}
         {{/withXml}}
         {{#joda}}
         {{^useJackson3}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jersey3/JavaJersey3WithXmlTest.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.openapitools.codegen.java.jersey3;
+
+import org.openapitools.codegen.DefaultGenerator;
+import org.openapitools.codegen.config.CodegenConfigurator;
+import org.openapitools.codegen.languages.JavaClientCodegen;
+import org.testng.annotations.Test;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+
+import static org.testng.Assert.assertTrue;
+
+/**
+ * Verifies that the jersey3 library supports the withXml option
+ * when {@code withXml=true} is set.
+ */
+public class JavaJersey3WithXmlTest {
+
+    private static final String PETSTORE_SPEC = "src/test/resources/3_0/petstore.yaml";
+
+    @Test
+    public void jersey3WithXmlDoesNotThrow() throws Exception {
+        Path output = Files.createTempDirectory("jersey3-withXml-positive");
+        output.toFile().deleteOnExit();
+
+        List<File> files = generateWithXml(output);
+        assertTrue(!files.isEmpty(), "Generation should produce files");
+    }
+
+    @Test
+    public void pomReferencesXmlArtifacts_Jackson2() throws Exception {
+        Path output = Files.createTempDirectory("jersey3-jackson2-xml-pom");
+        output.toFile().deleteOnExit();
+        generateWithXml(output);
+
+        String pom = Files.readString(output.resolve("pom.xml"));
+        //xml jackson2 libs
+        assertTrue(pom.contains("<groupId>com.fasterxml.jackson.dataformat</groupId>"),
+                "pom.xml should contain com.fasterxml.jackson.dataformat group");
+        assertTrue(pom.contains("<artifactId>jackson-dataformat-xml</artifactId>"),
+                "pom.xml should contain jackson-dataformat-xml artifact");
+    }
+
+    private List<File> generateWithXml(Path outputDir) {
+        CodegenConfigurator configurator = new CodegenConfigurator()
+                .setGeneratorName("java")
+                .setLibrary(JavaClientCodegen.JERSEY3)
+                .setInputSpec(PETSTORE_SPEC)
+                .setOutputDir(outputDir.toAbsolutePath().toString());
+        configurator.addAdditionalProperty(JavaClientCodegen.WITH_XML, true);
+        DefaultGenerator generator = new DefaultGenerator();
+        generator.setGenerateMetadata(false);
+        return generator.opts(configurator.toClientOptInput()).generate();
+    }
+
+}