Can not upload files with MobileFoundation Adapter - ibm-mobilefirst

Question

We create an Java Adapter that calls the API to upload files via MobileFoundation. However, when the application calls the Adapter, it will result in a server error and will not work.
In addition, I have created a JavaScript Adapter, but the same error occurred.
Please tell me how to resolve.
Adapter that was created is as follows.
#POST
#Path("/uploadimage")
#Produces(MediaType.APPLICATION_JSON)
#Consumes(MediaType.MULTIPART_FORM_DATA)
#OAuthSecurity(enabled=false)
public void postFileUpload(#Context HttpServletResponse response,
#FormParam("image_type") #DefaultValue("") String image_type,
#Encoded #FormParam("file") File file
)
throws IOException, IllegalStateException, SAXException {
(Since it is an error before reaching the logic inside, method contents are omitted.)
The error is as follows.
[12/5/17 6:09:38:687 UTC] 0000af3f SystemErr R java.lang.RuntimeException: Invalid URL encoding: not a valid digit (radix 16): 14
[12/5/17 6:09:38:688 UTC] 0000af3f SystemErr R at org.apache.cxf.common.util.UrlUtils.digit16(UrlUtils.java:114)
[12/5/17 6:09:38:688 UTC] 0000af3f SystemErr R at org.apache.cxf.common.util.UrlUtils.urlDecode(UrlUtils.java:94)
[12/5/17 6:09:38:689 UTC] 0000af3f SystemErr R at org.apache.cxf.common.util.UrlUtils.urlDecode(UrlUtils.java:66)
[12/5/17 6:09:38:689 UTC] 0000af3f SystemErr R at org.apache.cxf.common.util.UrlUtils.urlDecode(UrlUtils.java:121)
[12/5/17 6:09:38:689 UTC] 0000af3f SystemErr R at org.apache.cxf.jaxrs.utils.HttpUtils.urlDecode(HttpUtils.java:94)
[12/5/17 6:09:38:689 UTC] 0000af3f SystemErr R at org.apache.cxf.jaxrs.utils.FormUtils.populateMapFromMultipart(FormUtils.java:223)
[12/5/17 6:09:38:689 UTC] 0000af3f SystemErr R at org.apache.cxf.jaxrs.utils.JAXRSUtils.processFormParam(JAXRSUtils.java:956)
[12/5/17 6:09:38:691 UTC] 0000af3f SystemErr R at org.apache.cxf.jaxrs.utils.JAXRSUtils.createHttpParameterValue(JAXRSUtils.java:877)
[12/5/17 6:09:38:692 UTC] 0000af3f SystemErr R at org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameter(JAXRSUtils.java:837)
[12/5/17 6:09:38:692 UTC] 0000af3f SystemErr R at org.apache.cxf.jaxrs.utils.JAXRSUtils.processParameters(JAXRSUtils.java:787)
......
Dummy JavaScript Adapter that was created is as follows.
function postImage() {
var input = {
method : 'post',
returnedContentType : 'json',
path : "test/"
};
return MFP.Server.invokeHttp(input);}
The request is as follows.
POST https://*****.mybluemix.net/mfp/api/adapters/JsAdapter/postImage
POST data:
--4ds9bnG-WijS3-W773egmV2-qxb8LBZeUfEr
Content-Disposition: form-data; name="timestamp"
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
2017-11-20 14:55:22.128000
--4ds9bnG-WijS3-W773egmV2-qxb8LBZeUfEr
Content-Disposition: form-data; name="file"; filename="button_no.png"
Content-Type: image/png
Content-Transfer-Encoding: binary
--4ds9bnG-WijS3-W773egmV2-qxb8LBZeUfEr
Content-Disposition: form-data; name="thumbnail"; filename="button_yes.png"
Content-Type: image/png
Content-Transfer-Encoding: binary
--4ds9bnG-WijS3-W773egmV2-qxb8LBZeUfEr--
[no cookies]
Request Headers:
Connection: close
Content-Length: 107452
Content-Type: multipart/form-data; boundary=4ds9bnG-WijS3-W773egmV2-qxb8LBZeUfEr
Host: *****.mybluemix.net
User-Agent: Apache-HttpClient/4.5.3 (Java/1.8.0_151)