MessageBodyWriter not found StreamingBodyResponse - response-entity

Question

I am trying to make StreamResponseBody work with sample hardcoded data.
#POST
#Path("filetypecsv")
#Produces("text/plain")
public ResponseEntity<StreamingResponseBody> studentsFile() {
String name = "name";
String rollNo = "rollNo";
StreamingResponseBody stream = output -> {
Writer writer = new BufferedWriter(new OutputStreamWriter(output));
writer.write("name,rollNo"+"\n");
for (int i = 1; i <= 1000; i++) {
writer.write(name + i + " ," + rollNo + i + "\n");
writer.flush();
}
};
return ResponseEntity.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=students.csv")
.contentType(org.springframework.http.MediaType.TEXT_PLAIN)
.body(stream);
}
I am always getting this error :
SEVERE: MessageBodyWriter not found for media type=text/plain, type=class org.springframwork.http.ResponseEntity, genericType=org.springframework.http.ReponseEntity<StreamingResponseBody>.
I have added the dependency : jersey-media-json-jackson.
But I am still getting this error, please advise.

Answer 1

This solution applies if your code is using Jax.rs.core and not Spring #RestController. I have not seen a solution where you can use Springs StreamingResponseBody along with jax.rs
But instead you can use jax.rs StreamingOutput. You can return a jax.rs Response, and (MediaType.TEXT_PLAIN) or equivalent like an octet stream.
Please see this link - https://dzone.com/articles/jax-rs-streaming-response
StreamingOutput stream = new StreamingOutput() {
#Override
public void write(OutputStream os) throws IOException, WebApplicationException {
Writer writer = new BufferedWriter(new OutputStreamWriter(os));
for (org.neo4j.graphdb.Path path : paths) {
writer.write(path.toString() + "\n");
}
writer.flush();
}
};
return Response.ok(stream).build();