Upload documents with OPENTEXT REST API not working - rest

Question

I'm new to the OPENTEXT Rest API and while I'm able to authenticate/create folders using it, I can't get the document upload to work. The following is the code I've been using:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
URIBuilder builder = new URIBuilder(https://bla.com/<restapiroot/v2/nodes");
builder.setParameter("type", "144")
.setParameter("parent_id", "123456")
.setParameter("name", "bla.pdf")
.setParameter("file", "C:\\My_Data\\bla.pdf");
MultipartEntityBuilder multiPartBuilder = MultipartEntityBuilder.create();
multiPartBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
multiPartBuilder.addBinaryBody("ufile", new File (fullFileName), ContentType.DEFAULT_BINARY, fileName);
multiPartBuilder.setBoundary("aall12dk##Joey");
HttpPost httpPostRequest = new HttpPost(builder.build());
httpPostRequest.addHeader( "<auth code name>", "value" );
httpPostRequest.addHeader( HttpHeaders.CONTENT_TYPE, "multipart/form-data; boundary=aall12dk##Joey" );
httpPostRequest.addHeader( "Content-Disposition", "attachment;filename=" + "bla.pdf" );
httpPostRequest.setEntity(multiPartBuilder.build());
HttpResponse response = = httpClient.execute(httpPostRequest);
I get the following error:
00:47:47.694 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "{"error":"Could not process object, invalid action \u0027create\u0027"}"
00:47:47.695 [main] DEBUG org.apache.http.headers - http-outgoing-0 << HTTP/1.1 500 Internal Server Error
I'm not sure if I'm invoking the API wrong and/or whether I'm coding the file upload logic wrong entirely. Any help would be greatly appreciated.
Thank you

Answer 1

I got the solution for this. Basically, the answer is to use only a generic URIBuilder. Everything else goes to the multi-part builder:
URIBuilder builder = new URIBuilder("https://bla.com/<restapiroot>/v2/nodes");
MultipartEntityBuilder multiPartBuilder = MultipartEntityBuilder.create();
multiPartBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
multiPartBuilder.setBoundary("aall12dk##RandomBoundary2019"); //Random value basically.
multiPartBuilder.addPart("type", new StringBody(String.valueOf(LAPI_DOCUMENTS.DOCUMENTSUBTYPE), ContentType.MULTIPART_FORM_DATA));
multiPartBuilder.addPart("parent_id", new StringBody(String.valueOf(parentId), ContentType.MULTIPART_FORM_DATA));
multiPartBuilder.addPart("name", new StringBody(fileName, ContentType.MULTIPART_FORM_DATA));
multiPartBuilder.addPart("file", new FileBody(new File (fullFileName), ContentType.DEFAULT_BINARY));
multiPartBuilder.addPart("description", new StringBody(comments, ContentType.MULTIPART_FORM_DATA));
multiPartBuilder.addPart("external_create_date", new StringBody("2017-12-10", ContentType.MULTIPART_FORM_DATA));
multiPartBuilder.addPart("external_modify_date", new StringBody(LocalDate.now().toString(), ContentType.MULTIPART_FORM_DATA));
multiPartBuilder.addPart("external_source", new StringBody("ftp", ContentType.MULTIPART_FORM_DATA));
HttpPost httpPostRequest = new HttpPost(builder.build());
httpPostRequest.addHeader("<TicketHeaderName>", "<ticket value>");
httpPostRequest.setEntity(multiPartBuilder.build());
HttpResponse response = httpClient.execute(httpPostRequest); //need to assign response to variable or you'll end up with hanging connections.
if ( response.getStatusLine().getStatusCode() != 200 ) {
//Error handling logic
}