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jersey-all is a rebundled verison of Jersey as one OSGi bundle.
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package org.glassfish.jersey.media.sse;

import java.io.InputStream;
import java.lang.annotation.Annotation;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

import org.glassfish.jersey.client.ChunkParser;
import org.glassfish.jersey.client.ChunkedInput;
import org.glassfish.jersey.internal.PropertiesDelegate;
import org.glassfish.jersey.message.MessageBodyWorkers;

/**
 * Inbound Server-Sent Events channel.
 *
 * The input channel lets you serially read & consume SSE events as they arrive.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class EventInput extends ChunkedInput {
    /**
     * SSE event chunk parser - SSE chunks are delimited with a fixed "\n\n" delimiter in the response stream.
     */
    private static final ChunkParser SSE_EVENT_PARSER = ChunkedInput.createParser("\n\n");

    /**
     * Package-private constructor used by the {@link org.glassfish.jersey.client.ChunkedInputReader}.
     *
     * @param inputStream        response input stream.
     * @param annotations        annotations associated with response entity.
     * @param mediaType          response entity media type.
     * @param headers            response headers.
     * @param messageBodyWorkers message body workers.
     * @param propertiesDelegate properties delegate for this request/response.
     */
    EventInput(InputStream inputStream,
               Annotation[] annotations,
               MediaType mediaType,
               MultivaluedMap headers,
               MessageBodyWorkers messageBodyWorkers,
               PropertiesDelegate propertiesDelegate) {
        super(InboundEvent.class, inputStream, annotations, mediaType, headers, messageBodyWorkers, propertiesDelegate);

        super.setParser(SSE_EVENT_PARSER);
    }
}