added jaxb-jakarta module on the basis of jaxb module

jaxb-jakarta/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright 2012-2023 The Feign Authors
+
+    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
+
+    http://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.
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>io.github.openfeign</groupId>
+        <artifactId>parent</artifactId>
+        <version>12.4-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>feign-jaxb-jakarta</artifactId>
+    <name>Feign JAXB Jakarta</name>
+    <description>Feign JAXB Jakarta</description>
+
+    <properties>
+        <main.basedir>${project.basedir}/..</main.basedir>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>feign-core</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>feign-core</artifactId>
+            <type>test-jar</type>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.xml.bind</groupId>
+            <artifactId>jakarta.xml.bind-api</artifactId>
+            <version>4.0.0</version>
+        </dependency>
+
+        <!-- Test -->
+        <dependency>
+            <groupId>com.sun.xml.bind</groupId>
+            <artifactId>jaxb-impl</artifactId>
+            <version>4.0.0</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

jaxb-jakarta/src/main/java/feign/jaxb/JAXBContextCacheKey.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-2023 The Feign Authors
+ *
+ * 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
+ *
+ * http://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 feign.jaxb;
+
+/**
+ * Encapsulate data used to build the cache key of JAXBContext.
+ */
+interface JAXBContextCacheKey {
+}

jaxb-jakarta/src/main/java/feign/jaxb/JAXBContextClassCacheKey.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2012-2023 The Feign Authors
+ *
+ * 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
+ *
+ * http://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 feign.jaxb;
+
+import java.util.Objects;
+
+/**
+ * Encapsulate data used to build the cache key of JAXBContext when created using class mode.
+ */
+final class JAXBContextClassCacheKey implements JAXBContextCacheKey {
+
+  private final Class<?> clazz;
+
+  JAXBContextClassCacheKey(Class<?> clazz) {
+    this.clazz = clazz;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o)
+      return true;
+    if (o == null || getClass() != o.getClass())
+      return false;
+    JAXBContextClassCacheKey that = (JAXBContextClassCacheKey) o;
+    return clazz.equals(that.clazz);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(clazz);
+  }
+}

jaxb-jakarta/src/main/java/feign/jaxb/JAXBContextFactory.java

@@ -0,0 +1,196 @@
+/*
+ * Copyright 2012-2023 The Feign Authors
+ *
+ * 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
+ *
+ * http://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 feign.jaxb;
+
+import jakarta.xml.bind.*;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Creates and caches JAXB contexts as well as creates Marshallers and Unmarshallers for each
+ * context. Since JAXB contexts creation can be an expensive task, JAXB context can be preloaded on
+ * factory creation otherwise they will be created and cached dynamically when needed.
+ */
+public final class JAXBContextFactory {
+
+  private final ConcurrentHashMap<JAXBContextCacheKey, JAXBContext> jaxbContexts =
+      new ConcurrentHashMap<>(64);
+  private final Map<String, Object> properties;
+  private final JAXBContextInstantationMode jaxbContextInstantationMode;
+
+  private JAXBContextFactory(Map<String, Object> properties,
+      JAXBContextInstantationMode jaxbContextInstantationMode) {
+    this.properties = properties;
+    this.jaxbContextInstantationMode = jaxbContextInstantationMode;
+  }
+
+  /**
+   * Creates a new {@link jakarta.xml.bind.Unmarshaller} that handles the supplied class.
+   */
+  public Unmarshaller createUnmarshaller(Class<?> clazz) throws JAXBException {
+    return getContext(clazz).createUnmarshaller();
+  }
+
+  /**
+   * Creates a new {@link jakarta.xml.bind.Marshaller} that handles the supplied class.
+   */
+  public Marshaller createMarshaller(Class<?> clazz) throws JAXBException {
+    Marshaller marshaller = getContext(clazz).createMarshaller();
+    setMarshallerProperties(marshaller);
+    return marshaller;
+  }
+
+  private void setMarshallerProperties(Marshaller marshaller) throws PropertyException {
+    for (Entry<String, Object> en : properties.entrySet()) {
+      marshaller.setProperty(en.getKey(), en.getValue());
+    }
+  }
+
+  private JAXBContext getContext(Class<?> clazz) throws JAXBException {
+    JAXBContextCacheKey cacheKey = jaxbContextInstantationMode.getJAXBContextCacheKey(clazz);
+    JAXBContext jaxbContext = this.jaxbContexts.get(cacheKey);
+
+    if (jaxbContext == null) {
+      jaxbContext = jaxbContextInstantationMode.getJAXBContext(clazz);
+      this.jaxbContexts.putIfAbsent(cacheKey, jaxbContext);
+    }
+    return jaxbContext;
+  }
+
+  /**
+   * Will preload factory's cache with JAXBContext for provided classes
+   * 
+   * @param classes
+   * @throws jakarta.xml.bind.JAXBException
+   */
+  private void preloadContextCache(List<Class<?>> classes) throws JAXBException {
+    if (classes != null && !classes.isEmpty()) {
+      for (Class<?> clazz : classes) {
+        getContext(clazz);
+      }
+    }
+  }
+
+  /**
+   * Creates instances of {@link JAXBContextFactory}.
+   */
+  public static class Builder {
+
+    private final Map<String, Object> properties = new HashMap<>(10);
+
+    private JAXBContextInstantationMode jaxbContextInstantationMode =
+        JAXBContextInstantationMode.CLASS;
+
+    /**
+     * Sets the jaxb.encoding property of any Marshaller created by this factory.
+     */
+    public Builder withMarshallerJAXBEncoding(String value) {
+      properties.put(Marshaller.JAXB_ENCODING, value);
+      return this;
+    }
+
+    /**
+     * Sets the jaxb.schemaLocation property of any Marshaller created by this factory.
+     */
+    public Builder withMarshallerSchemaLocation(String value) {
+      properties.put(Marshaller.JAXB_SCHEMA_LOCATION, value);
+      return this;
+    }
+
+    /**
+     * Sets the jaxb.noNamespaceSchemaLocation property of any Marshaller created by this factory.
+     */
+    public Builder withMarshallerNoNamespaceSchemaLocation(String value) {
+      properties.put(Marshaller.JAXB_NO_NAMESPACE_SCHEMA_LOCATION, value);
+      return this;
+    }
+
+    /**
+     * Sets the jaxb.formatted.output property of any Marshaller created by this factory.
+     */
+    public Builder withMarshallerFormattedOutput(Boolean value) {
+      properties.put(Marshaller.JAXB_FORMATTED_OUTPUT, value);
+      return this;
+    }
+
+    /**
+     * Sets the jaxb.fragment property of any Marshaller created by this factory.
+     */
+    public Builder withMarshallerFragment(Boolean value) {
+      properties.put(Marshaller.JAXB_FRAGMENT, value);
+      return this;
+    }
+
+    /**
+     * Sets the given property of any Marshaller created by this factory.
+     * 
+     * <p>
+     * Example : <br>
+     * <br>
+     * <code>
+     *    new JAXBContextFactory.Builder()
+     *      .withProperty("com.sun.xml.internal.bind.xmlHeaders", "&lt;!DOCTYPE Example SYSTEM \&quot;example.dtd\&quot;&gt;")
+     *      .build();
+     * </code>
+     * </p>
+     */
+    public Builder withProperty(String key, Object value) {
+      properties.put(key, value);
+      return this;
+    }
+
+    /**
+     * Provide an instantiation mode for JAXB Contexts, can be class or package, default is class if
+     * this method is not called.
+     *
+     * <p>
+     * Example : <br>
+     * <br>
+     * <code>
+     *    new JAXBContextFactory.Builder()
+     *      .withJAXBContextInstantiationMode(JAXBContextInstantationMode.PACKAGE)
+     *      .build();
+     * </code>
+     * </p>
+     */
+    public Builder withJAXBContextInstantiationMode(JAXBContextInstantationMode jaxbContextInstantiationMode) {
+      this.jaxbContextInstantationMode = jaxbContextInstantiationMode;
+      return this;
+    }
+
+    /**
+     * Creates a new {@link JAXBContextFactory} instance with a lazy loading cached context
+     */
+    public JAXBContextFactory build() {
+      return new JAXBContextFactory(properties, jaxbContextInstantationMode);
+    }
+
+    /**
+     * Creates a new {@link JAXBContextFactory} instance. Pre-loads context cache with given classes
+     *
+     * @param classes
+     * @return ContextFactory with a pre-populated JAXBContext cache
+     * @throws jakarta.xml.bind.JAXBException if provided classes can't be used for JAXBContext
+     *         generation most likely due to missing JAXB annotations
+     */
+    public JAXBContextFactory build(List<Class<?>> classes) throws JAXBException {
+      JAXBContextFactory factory = new JAXBContextFactory(properties, jaxbContextInstantationMode);
+      factory.preloadContextCache(classes);
+      return factory;
+    }
+  }
+}

jaxb-jakarta/src/main/java/feign/jaxb/JAXBContextInstantationMode.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2012-2023 The Feign Authors
+ *
+ * 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
+ *
+ * http://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 feign.jaxb;
+
+
+import jakarta.xml.bind.JAXBContext;
+import jakarta.xml.bind.JAXBException;
+
+/**
+ * Provides differents ways to instantiate a JAXB Context.
+ */
+public enum JAXBContextInstantationMode {
+
+  CLASS {
+    @Override
+    JAXBContextCacheKey getJAXBContextCacheKey(Class<?> clazz) {
+      return new JAXBContextClassCacheKey(clazz);
+    }
+
+    @Override
+    JAXBContext getJAXBContext(Class<?> clazz) throws JAXBException {
+      return JAXBContext.newInstance(clazz);
+    }
+  },
+
+  PACKAGE {
+    @Override
+    JAXBContextCacheKey getJAXBContextCacheKey(Class<?> clazz) {
+      return new JAXBContextPackageCacheKey(clazz.getPackage().getName(), clazz.getClassLoader());
+    }
+
+    @Override
+    JAXBContext getJAXBContext(Class<?> clazz) throws JAXBException {
+      return JAXBContext.newInstance(clazz.getPackage().getName(), clazz.getClassLoader());
+    }
+  };
+
+  abstract JAXBContextCacheKey getJAXBContextCacheKey(Class<?> clazz);
+
+  abstract JAXBContext getJAXBContext(Class<?> clazz) throws JAXBException;
+}