Fix Multipart media type override by Jersey defaults.

Signed-off-by: jansupol <[email protected]>

media/multipart/src/main/java/org/glassfish/jersey/media/multipart/JerseyEntityPartBuilderProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2022 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
@@ -159,7 +159,7 @@ protected FormDataBodyPart build() {
                 final StreamDataBodyPart streamDataBodyPart = new StreamDataBodyPart();
                 streamDataBodyPart.setFilename(fileName);
                 fillFormData(streamDataBodyPart);
-                streamDataBodyPart.setStreamEntity(content);
+                streamDataBodyPart.setStreamEntity(content, mediaType);
                 return streamDataBodyPart;
             }
         }
@@ -173,7 +173,11 @@ protected FileMethodData(File content) {
             protected FormDataBodyPart build() {
                 final FileDataBodyPart fileDataBodyPart = new FileDataBodyPart();
                 fillFormData(fileDataBodyPart);
-                fileDataBodyPart.setFileEntity(content);
+                if (mediaType != null) {
+                    fileDataBodyPart.setFileEntity(content, mediaType);
+                } else {
+                    fileDataBodyPart.setFileEntity(content);
+                }
                 return fileDataBodyPart;
             }
         }

media/multipart/src/test/java/org/glassfish/jersey/media/multipart/MediaTypeTest.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2022 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;
+
+import jakarta.ws.rs.core.EntityPart;
+import jakarta.ws.rs.core.MediaType;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+
+public class MediaTypeTest {
+    @Test
+    public void testInputStreamDataMediaType() throws IOException {
+        ByteArrayInputStream bais = new ByteArrayInputStream("test".getBytes());
+        EntityPart entityPart = EntityPart.withName("textFile").fileName("test.txt")
+                .content(bais)
+                .mediaType(MediaType.TEXT_PLAIN_TYPE)
+                .build();
+        Assert.assertEquals(MediaType.TEXT_PLAIN_TYPE, entityPart.getMediaType());
+    }
+
+    @Test
+    public void testFileDataMediaType() throws IOException {
+        EntityPart entityPart = EntityPart.withName("textFile")
+                .content(new File("anyname"), File.class)
+                .mediaType(MediaType.TEXT_PLAIN_TYPE)
+                .build();
+        Assert.assertEquals(MediaType.TEXT_PLAIN_TYPE, entityPart.getMediaType());
+    }
+
+    @Test
+    public void testGenericDataMediaType() throws IOException {
+        EntityPart entityPart = EntityPart.withName("textFile")
+                .content("Hello", String.class)
+                .mediaType(MediaType.TEXT_PLAIN_TYPE)
+                .build();
+        Assert.assertEquals(MediaType.TEXT_PLAIN_TYPE, entityPart.getMediaType());
+    }
+
+    @Test
+    public void testInputStreamDataNullMediaType() throws IOException {
+        ByteArrayInputStream bais = new ByteArrayInputStream("test".getBytes());
+        EntityPart entityPart = EntityPart.withName("textFile").fileName("test.txt")
+                .content(bais)
+                .build();
+        Assert.assertEquals(MediaType.APPLICATION_OCTET_STREAM_TYPE, entityPart.getMediaType());
+    }
+
+    @Test
+    public void testGenericDataNullMediaType() throws IOException {
+        EntityPart entityPart = EntityPart.withName("textFile")
+                .content("Hello", String.class)
+                .build();
+        Assert.assertEquals(MediaType.TEXT_PLAIN_TYPE, entityPart.getMediaType());
+    }
+}