InputStream closed unexpectedly while using Jersey MultiPart file upload & Server-Sent Events (SSE) - asynchronous

Question

I'm using Jersey Multipart for uploading file to the server via Rest API. In the resource method, I accessed the file content via InputStream. I want to return the uploaded file size to the client with EventOutput using SSE so the client easily get the uploaded file size directly from upload resource method.
I'm using Jersey as JAX-RS implementation in java with Grizzly Http server. Here is my code:
#POST
#Path("upload")
#Produces(SseFeature.SERVER_SENT_EVENTS)
#Consumes("multipart/form-data;charset=utf-8")
public EventOutput upload(#FormDataParam("file") InputStream file,
#FormDataParam("file") FormDataContentDisposition fileDisposition) {
final EventOutput eventOutput = new EventOutput();
try {
new Thread(new Runnable() {
#Override
public void run() {
try {
int read = -1;
byte[] buffer = new byte[1024];
OutboundEvent.Builder eventBuilder
= new OutboundEvent.Builder();
OutboundEvent event = null;
long totalRead = 0, lastReadMB = 0;
while ((read = file.read(buffer)) != -1) {
totalRead += read;
if (lastReadMB != (totalRead / (1024 * 1024))) {
lastReadMB = totalRead / (1024 * 1024);
event = eventBuilder.name("uploaded").data(Long.class, totalRead).build();
eventOutput.write(event);
}
}
event = eventBuilder.name("uploaded").data(Long.class, totalRead).build();
eventOutput.write(event);
} catch (Exception e) {
throw new RuntimeException(
"Error when writing the event.", e);
} finally {
try {
eventOutput.close();
} catch (Exception ioClose) {
throw new RuntimeException(
"Error when closing the event output.", ioClose);
}
}
}
}).start();
return eventOutput;
} catch (Exception e) {
logger.error(e.toString(), e);
}
throw new WebApplicationException(Response.status(Response.Status.INTERNAL_SERVER_ERROR).
entity("something happened").build());
}
​
The problem is when my resource method return EventOutput as a response and request processing thread back to the I/O container, the InputStream closed and the processing thread can't access to the uploaded file. Here is the exception:
Exception in thread "Thread-1" java.lang.RuntimeException: Error when writing the event.
at com.WebService.ContentService$1.run(ContentService.java:192)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.jvnet.mimepull.MIMEParsingException: java.io.IOException: Stream Closed
at org.jvnet.mimepull.WeakDataFile.read(WeakDataFile.java:115)
at org.jvnet.mimepull.DataFile.read(DataFile.java:77)
at org.jvnet.mimepull.FileData.read(FileData.java:69)
at org.jvnet.mimepull.DataHead$ReadMultiStream.fetch(DataHead.java:265)
at org.jvnet.mimepull.DataHead$ReadMultiStream.read(DataHead.java:219)
at java.io.InputStream.read(InputStream.java:101)
at com.WebService.ContentService$1.run(ContentService.java:181)
... 1 more
Caused by: java.io.IOException: Stream Closed
at java.io.RandomAccessFile.seek0(Native Method)
at java.io.RandomAccessFile.seek(RandomAccessFile.java:557)
at org.jvnet.mimepull.WeakDataFile.read(WeakDataFile.java:112)
... 7 more
​
1- What's the problem in the code? Why InputStream is closed in the middle of the file transfer?
2- Is there any alternative way to return the uploaded file size to the client in server side? (REQUIREMENT: the upload resource method must handle upload file asynchronously in different thread)