added java/undertow-jersey-hikaricp plaintext support (#2187)

frameworks/Java/undertow-jersey-hikaricp/benchmark_config.json

@@ -7,6 +7,7 @@
      "db_url": "/db?single=true",
      "query_url": "/db?queries=",
      "fortune_url": "/fortunes",
      "plaintext_url": "/plaintext",
      "port": 8080,
      "approach": "Realistic",
      "classification": "Micro",

frameworks/Java/undertow-jersey-hikaricp/src/main/java/hello/JerseyWebServer.java

@@ -35,7 +35,7 @@ public static void main(final String[] args) throws Exception
    final int dbPort = Integer.parseInt(cmd.getOptionValue("dbport", "3306"));

    ResourceConfig config = new ResourceConfig(DbResource.class,
        FortunesResource.class, JsonResource.class,
        FortunesResource.class, JsonResource.class, PlaintextResource.class,
        JsonMessageBodyWriter.class, ServerResponseFilter.class, RequestExceptionMapper.class);

    config.setProperties(new HashMap<String, Object>()

frameworks/Java/undertow-jersey-hikaricp/src/main/java/hello/PlaintextResource.java

@@ -0,0 +1,18 @@
package hello;

import javax.inject.*;
import javax.ws.rs.*;
import java.util.*;

@Singleton
@Path("/plaintext")
public class PlaintextResource
{

  @GET
  @Produces("text/plain")
  public String plaintext()
  {
    return "Hello, World!";
  }
}