Enable @FormParam EntityPart injection to fields

core-server/src/main/java/org/glassfish/jersey/server/internal/inject/FormParamValueParamProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2021 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2023 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -91,6 +91,15 @@ public FormParamValueParamProvider(Provider<MultivaluedParameterExtractorProvide
             return null;
         }
 
+        if (EntityPart.class == parameter.getType()) {
+            return new Function<ContainerRequest, Object>() {
+                @Override
+                public Object apply(ContainerRequest containerRequest) {
+                    return multipartProvider.getEntityPart(containerRequest, parameter);
+                }
+            };
+        }
+
         MultivaluedParameterExtractor e = get(parameter);
         if (e == null) {
             return null;
@@ -259,14 +268,11 @@ private MultipartFormParamValueProvider(InjectionManager injectionManager) {
             });
         }
 
-
         @Override
         public Object apply(ContainerRequest containerRequest, Parameter parameter) {
             Object entity = null;
-            if (entityPartProvider.get() != null) { // else jersey-multipart module is missing
-                final Function<ContainerRequest, ?> valueSupplier = entityPartProvider.get().getValueProvider(
-                        new WrappingFormParamParameter(entityPartParameter, parameter));
-                final EntityPart entityPart = (EntityPart) valueSupplier.apply(containerRequest);
+            final EntityPart entityPart = getEntityPart(containerRequest, parameter);
+            if (entityPart != null) { // else jersey-multipart module is missing
                 try {
                     entity = parameter.getType() != parameter.getRawType()
                             ? entityPart.getContent(genericType(parameter.getRawType(), parameter.getType()))
@@ -279,6 +285,16 @@ public Object apply(ContainerRequest containerRequest, Parameter parameter) {
             return entity;
         }
 
+        private EntityPart getEntityPart(ContainerRequest containerRequest, Parameter parameter) {
+            final ValueParamProvider valueParamProvider = entityPartProvider.get();
+            if (valueParamProvider != null) { // else jersey-multipart module is missing
+                final Function<ContainerRequest, ?> valueSupplier = valueParamProvider.getValueProvider(
+                        new WrappingFormParamParameter(entityPartParameter, parameter));
+                return (EntityPart) valueSupplier.apply(containerRequest);
+            }
+            return null;
+        }
+
         private GenericType genericType(Type rawType, Type genericType) {
             return new GenericType(new ParameterizedType() {
                 @Override

media/multipart/src/test/java/org/glassfish/jersey/media/multipart/internal/EntityPartBeansTest.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0, which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the
+ * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+ * version 2 with the GNU Classpath Exception, which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+
+package org.glassfish.jersey.media.multipart.internal;
+
+import jakarta.ws.rs.Consumes;
+import jakarta.ws.rs.FormParam;
+import jakarta.ws.rs.POST;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.client.Entity;
+import jakarta.ws.rs.client.WebTarget;
+import jakarta.ws.rs.core.Application;
+import jakarta.ws.rs.core.EntityPart;
+import jakarta.ws.rs.core.GenericEntity;
+import jakarta.ws.rs.core.MediaType;
+import org.glassfish.jersey.server.ResourceConfig;
+import org.glassfish.jersey.test.JerseyTest;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EntityPartBeansTest extends JerseyTest {
+
+    @Path("/form-field-injected")
+    public static class MultiPartFieldInjectedResource {
+        @FormParam("string")
+        EntityPart stringEntityPart;
+
+        @POST
+        @Path("xml-jaxb-part")
+        @Consumes(MediaType.MULTIPART_FORM_DATA)
+        public String post() throws IOException {
+            return stringEntityPart.getContent(String.class) + ":" + stringEntityPart.getFileName().get();
+        }
+    }
+
+    @Override
+    protected Application configure() {
+        return new ResourceConfig(MultiPartFieldInjectedResource.class);
+    }
+
+    @Test
+    public void testInjectedEntityPartBeans() throws IOException {
+        final WebTarget target = target().path("/form-field-injected/xml-jaxb-part");
+
+        final EntityPart entityPart = EntityPart.withName("string").fileName("string")
+                .content("STRING", String.class)
+                .build();
+
+        final GenericEntity<List<EntityPart>> genericEntity = new GenericEntity<>(List.of(entityPart)) {};
+
+        final String s = target.request().post(Entity.entity(genericEntity, MediaType.MULTIPART_FORM_DATA_TYPE), String.class);
+        assertEquals("STRING:string", s);
+    }
+}