diff --git a/indexing-service/src/main/java/io/druid/indexing/common/actions/RemoteTaskActionClient.java b/indexing-service/src/main/java/io/druid/indexing/common/actions/RemoteTaskActionClient.java
index 40ab0936488..08d4033b6ae 100644
--- a/indexing-service/src/main/java/io/druid/indexing/common/actions/RemoteTaskActionClient.java
+++ b/indexing-service/src/main/java/io/druid/indexing/common/actions/RemoteTaskActionClient.java
@@ -36,6 +36,7 @@ import io.druid.indexing.common.task.Task;
 import org.jboss.netty.channel.ChannelException;
 import org.joda.time.Duration;
 
+import javax.ws.rs.core.MediaType;
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -94,7 +95,7 @@ public class RemoteTaskActionClient implements TaskActionClient
 
         try {
           response = httpClient.post(serviceUri.toURL())
-                               .setContent("application/json", dataToSend)
+                               .setContent(MediaType.APPLICATION_JSON, dataToSend)
                                .go(new StatusResponseHandler(Charsets.UTF_8))
                                .get();
         }
diff --git a/indexing-service/src/main/java/io/druid/indexing/overlord/http/OverlordResource.java b/indexing-service/src/main/java/io/druid/indexing/overlord/http/OverlordResource.java
index 9f51d86762d..050a5620856 100644
--- a/indexing-service/src/main/java/io/druid/indexing/overlord/http/OverlordResource.java
+++ b/indexing-service/src/main/java/io/druid/indexing/overlord/http/OverlordResource.java
@@ -58,6 +58,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
 import java.io.InputStream;
@@ -100,8 +101,8 @@ public class OverlordResource
 
   @POST
   @Path("/task")
-  @Consumes("application/json")
-  @Produces("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
+  @Produces(MediaType.APPLICATION_JSON)
   public Response taskPost(final Task task)
   {
     return asLeaderWith(
@@ -127,7 +128,7 @@ public class OverlordResource
 
   @GET
   @Path("/task/{taskid}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTaskPayload(@PathParam("taskid") String taskid)
   {
     return optionalTaskResponse(taskid, "payload", taskStorageQueryAdapter.getTask(taskid));
@@ -135,7 +136,7 @@ public class OverlordResource
 
   @GET
   @Path("/task/{taskid}/status")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTaskStatus(@PathParam("taskid") String taskid)
   {
     return optionalTaskResponse(taskid, "status", taskStorageQueryAdapter.getStatus(taskid));
@@ -143,7 +144,7 @@ public class OverlordResource
 
   @GET
   @Path("/task/{taskid}/segments")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTaskSegments(@PathParam("taskid") String taskid)
   {
     final Set<DataSegment> segments = taskStorageQueryAdapter.getInsertedSegments(taskid);
@@ -152,7 +153,7 @@ public class OverlordResource
 
   @POST
   @Path("/task/{taskid}/shutdown")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response doShutdown(@PathParam("taskid") final String taskid)
   {
     return asLeaderWith(
@@ -171,7 +172,7 @@ public class OverlordResource
 
   @GET
   @Path("/worker")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getWorkerConfig()
   {
     if (workerConfigRef == null) {
@@ -183,7 +184,7 @@ public class OverlordResource
 
   @POST
   @Path("/worker")
-  @Consumes("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
   public Response setWorkerConfig(
       final WorkerBehaviorConfig workerBehaviorConfig
   )
@@ -201,7 +202,7 @@ public class OverlordResource
   @Deprecated
   @GET
   @Path("/worker/setup")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getWorkerSetupData()
   {
     if (workerSetupDataRef == null) {
@@ -214,7 +215,7 @@ public class OverlordResource
   @Deprecated
   @POST
   @Path("/worker/setup")
-  @Consumes("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
   public Response setWorkerSetupData(
       final WorkerSetupData workerSetupData
   )
@@ -230,7 +231,7 @@ public class OverlordResource
 
   @POST
   @Path("/action")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public <T> Response doAction(final TaskActionHolder<T> holder)
   {
     return asLeaderWith(
@@ -264,7 +265,7 @@ public class OverlordResource
 
   @GET
   @Path("/waitingTasks")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getWaitingTasks()
   {
     return workItemsResponse(
@@ -311,7 +312,7 @@ public class OverlordResource
 
   @GET
   @Path("/pendingTasks")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getPendingTasks()
   {
     return workItemsResponse(
@@ -328,7 +329,7 @@ public class OverlordResource
 
   @GET
   @Path("/runningTasks")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getRunningTasks()
   {
     return workItemsResponse(
@@ -345,7 +346,7 @@ public class OverlordResource
 
   @GET
   @Path("/completeTasks")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getCompleteTasks()
   {
     final List<TaskResponseObject> completeTasks = Lists.transform(
@@ -370,7 +371,7 @@ public class OverlordResource
 
   @GET
   @Path("/workers")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getWorkers()
   {
     return asLeaderWith(
@@ -388,7 +389,7 @@ public class OverlordResource
 
   @GET
   @Path("/scaling")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getScalingState()
   {
     // Don't use asLeaderWith, since we want to return 200 instead of 503 when missing an autoscaler.
diff --git a/indexing-service/src/main/java/io/druid/indexing/worker/http/WorkerResource.java b/indexing-service/src/main/java/io/druid/indexing/worker/http/WorkerResource.java
index 1bf4936f8e0..dbecb5361c3 100644
--- a/indexing-service/src/main/java/io/druid/indexing/worker/http/WorkerResource.java
+++ b/indexing-service/src/main/java/io/druid/indexing/worker/http/WorkerResource.java
@@ -39,6 +39,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.InputStream;
 
@@ -72,7 +73,7 @@ public class WorkerResource
 
   @POST
   @Path("/disable")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response doDisable()
   {
     try {
@@ -86,7 +87,7 @@ public class WorkerResource
 
   @POST
   @Path("/enable")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response doEnable()
   {
     try {
@@ -100,7 +101,7 @@ public class WorkerResource
 
   @GET
   @Path("/enabled")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response isEnabled()
   {
     try {
@@ -115,7 +116,7 @@ public class WorkerResource
 
   @GET
   @Path("/tasks")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTasks()
   {
     try {
@@ -142,7 +143,7 @@ public class WorkerResource
 
   @POST
   @Path("/task/{taskid}/shutdown")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response doShutdown(@PathParam("taskid") String taskid)
   {
     try {
diff --git a/server/src/main/java/io/druid/client/indexing/IndexingServiceClient.java b/server/src/main/java/io/druid/client/indexing/IndexingServiceClient.java
index c345bdb2669..07114c247f1 100644
--- a/server/src/main/java/io/druid/client/indexing/IndexingServiceClient.java
+++ b/server/src/main/java/io/druid/client/indexing/IndexingServiceClient.java
@@ -32,6 +32,7 @@ import io.druid.guice.annotations.Global;
 import io.druid.timeline.DataSegment;
 import org.joda.time.Interval;
 
+import javax.ws.rs.core.MediaType;
 import java.io.InputStream;
 import java.net.URL;
 import java.util.Iterator;
@@ -94,7 +95,7 @@ public class IndexingServiceClient
   {
     try {
       return client.post(new URL(String.format("%s/task", baseUrl())))
-                   .setContent("application/json", jsonMapper.writeValueAsBytes(queryObject))
+                   .setContent(MediaType.APPLICATION_JSON, jsonMapper.writeValueAsBytes(queryObject))
                    .go(RESPONSE_HANDLER)
                    .get();
     }
diff --git a/server/src/main/java/io/druid/segment/realtime/firehose/EventReceiverFirehoseFactory.java b/server/src/main/java/io/druid/segment/realtime/firehose/EventReceiverFirehoseFactory.java
index 80de1c3b152..c791c41324e 100644
--- a/server/src/main/java/io/druid/segment/realtime/firehose/EventReceiverFirehoseFactory.java
+++ b/server/src/main/java/io/druid/segment/realtime/firehose/EventReceiverFirehoseFactory.java
@@ -38,6 +38,7 @@ import io.druid.data.input.impl.MapInputRowParser;
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
 import java.util.Collection;
@@ -125,7 +126,7 @@ public class EventReceiverFirehoseFactory implements FirehoseFactory<MapInputRow
 
     @POST
     @Path("/push-events")
-    @Produces("application/json")
+    @Produces(MediaType.APPLICATION_JSON)
     public Response addAll(Collection<Map<String, Object>> events)
     {
       log.debug("Adding %,d events to firehose: %s", events.size(), serviceName);
diff --git a/server/src/main/java/io/druid/server/ClientInfoResource.java b/server/src/main/java/io/druid/server/ClientInfoResource.java
index cbd253525bb..2018611f9d7 100644
--- a/server/src/main/java/io/druid/server/ClientInfoResource.java
+++ b/server/src/main/java/io/druid/server/ClientInfoResource.java
@@ -36,6 +36,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -73,7 +74,7 @@ public class ClientInfoResource
   }
 
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Iterable<String> getDataSources()
   {
     return getSegmentsForDatasources().keySet();
@@ -81,7 +82,7 @@ public class ClientInfoResource
 
   @GET
   @Path("/{dataSourceName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Map<String, Object> getDatasource(
       @PathParam("dataSourceName") String dataSourceName,
       @QueryParam("interval") String interval
@@ -95,7 +96,7 @@ public class ClientInfoResource
 
   @GET
   @Path("/{dataSourceName}/dimensions")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Iterable<String> getDatasourceDimensions(
       @PathParam("dataSourceName") String dataSourceName,
       @QueryParam("interval") String interval
@@ -127,7 +128,7 @@ public class ClientInfoResource
 
   @GET
   @Path("/{dataSourceName}/metrics")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Iterable<String> getDatasourceMetrics(
       @PathParam("dataSourceName") String dataSourceName,
       @QueryParam("interval") String interval
diff --git a/server/src/main/java/io/druid/server/StatusResource.java b/server/src/main/java/io/druid/server/StatusResource.java
index 44aa50a0ee7..10fccf383ab 100644
--- a/server/src/main/java/io/druid/server/StatusResource.java
+++ b/server/src/main/java/io/druid/server/StatusResource.java
@@ -27,6 +27,7 @@ import io.druid.initialization.Initialization;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -37,7 +38,7 @@ import java.util.List;
 public class StatusResource
 {
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Status doGet()
   {
     return new Status(Initialization.getLoadedModules(DruidModule.class));
diff --git a/server/src/main/java/io/druid/server/bridge/BridgeQuerySegmentWalker.java b/server/src/main/java/io/druid/server/bridge/BridgeQuerySegmentWalker.java
index ee17781d5ac..dcc825758bc 100644
--- a/server/src/main/java/io/druid/server/bridge/BridgeQuerySegmentWalker.java
+++ b/server/src/main/java/io/druid/server/bridge/BridgeQuerySegmentWalker.java
@@ -38,6 +38,7 @@ import io.druid.query.QuerySegmentWalker;
 import io.druid.query.SegmentDescriptor;
 import org.joda.time.Interval;
 
+import javax.ws.rs.core.MediaType;
 import java.net.URL;
 import java.util.List;
 import java.util.Map;
@@ -102,7 +103,7 @@ public class BridgeQuerySegmentWalker implements QuerySegmentWalker
 
           StatusResponseHolder response = httpClient.post(new URL(url))
                                                     .setContent(
-                                                        "application/json",
+                                                        MediaType.APPLICATION_JSON,
                                                         jsonMapper.writeValueAsBytes(query)
                                                     )
                                                     .go(responseHandler)
diff --git a/server/src/main/java/io/druid/server/http/CoordinatorDynamicConfigsResource.java b/server/src/main/java/io/druid/server/http/CoordinatorDynamicConfigsResource.java
index 675818122e6..11b1ba4e5be 100644
--- a/server/src/main/java/io/druid/server/http/CoordinatorDynamicConfigsResource.java
+++ b/server/src/main/java/io/druid/server/http/CoordinatorDynamicConfigsResource.java
@@ -28,6 +28,7 @@ import javax.ws.rs.GET;
 import javax.ws.rs.POST;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 /**
@@ -46,7 +47,7 @@ public class CoordinatorDynamicConfigsResource
   }
 
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getDynamicConfigs()
   {
     return Response.ok(
@@ -58,7 +59,7 @@ public class CoordinatorDynamicConfigsResource
   }
 
   @POST
-  @Consumes("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
   public Response setDynamicConfigs(final CoordinatorDynamicConfig dynamicConfig)
   {
     if (!manager.set(CoordinatorDynamicConfig.CONFIG_KEY, dynamicConfig)) {
diff --git a/server/src/main/java/io/druid/server/http/CoordinatorResource.java b/server/src/main/java/io/druid/server/http/CoordinatorResource.java
index 6fbff039707..e661d31b17f 100644
--- a/server/src/main/java/io/druid/server/http/CoordinatorResource.java
+++ b/server/src/main/java/io/druid/server/http/CoordinatorResource.java
@@ -32,6 +32,7 @@ import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 /**
@@ -51,7 +52,7 @@ public class CoordinatorResource
 
   @GET
   @Path("/leader")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getLeader()
   {
     return Response.ok(coordinator.getCurrentLeader()).build();
@@ -59,7 +60,7 @@ public class CoordinatorResource
 
   @GET
   @Path("/loadstatus")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getLoadStatus(
       @QueryParam("simple") String simple,
       @QueryParam("full") String full
@@ -77,7 +78,7 @@ public class CoordinatorResource
 
   @GET
   @Path("/loadqueue")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getLoadQueue(
       @QueryParam("simple") String simple,
       @QueryParam("full") String full
diff --git a/server/src/main/java/io/druid/server/http/DatasourcesResource.java b/server/src/main/java/io/druid/server/http/DatasourcesResource.java
index cb44dad8338..6d88f1d8eae 100644
--- a/server/src/main/java/io/druid/server/http/DatasourcesResource.java
+++ b/server/src/main/java/io/druid/server/http/DatasourcesResource.java
@@ -47,6 +47,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.Comparator;
 import java.util.List;
@@ -76,7 +77,7 @@ public class DatasourcesResource
   }
 
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getQueryableDataSources(
       @QueryParam("full") String full,
       @QueryParam("simple") String simple
@@ -122,7 +123,7 @@ public class DatasourcesResource
 
   @GET
   @Path("/{dataSourceName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTheDataSource(
       @PathParam("dataSourceName") final String dataSourceName,
       @QueryParam("full") final String full
@@ -142,7 +143,7 @@ public class DatasourcesResource
 
   @POST
   @Path("/{dataSourceName}")
-  @Consumes("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
   public Response enableDataSource(
       @PathParam("dataSourceName") final String dataSourceName
   )
@@ -156,7 +157,7 @@ public class DatasourcesResource
 
   @DELETE
   @Path("/{dataSourceName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response deleteDataSource(
       @PathParam("dataSourceName") final String dataSourceName,
       @QueryParam("kill") final String kill,
@@ -190,7 +191,7 @@ public class DatasourcesResource
 
   @GET
   @Path("/{dataSourceName}/intervals")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getSegmentDataSourceIntervals(
       @PathParam("dataSourceName") String dataSourceName,
       @QueryParam("simple") String simple,
@@ -250,7 +251,7 @@ public class DatasourcesResource
 
   @GET
   @Path("/{dataSourceName}/intervals/{interval}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getSegmentDataSourceSpecificInterval(
       @PathParam("dataSourceName") String dataSourceName,
       @PathParam("interval") String interval,
@@ -317,7 +318,7 @@ public class DatasourcesResource
 
   @GET
   @Path("/{dataSourceName}/segments")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getSegmentDataSourceSegments(
       @PathParam("dataSourceName") String dataSourceName,
       @QueryParam("full") String full
@@ -350,7 +351,7 @@ public class DatasourcesResource
 
   @GET
   @Path("/{dataSourceName}/segments/{segmentId}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getSegmentDataSourceSegment(
       @PathParam("dataSourceName") String dataSourceName,
       @PathParam("segmentId") String segmentId
@@ -388,7 +389,7 @@ public class DatasourcesResource
 
   @POST
   @Path("/{dataSourceName}/segments/{segmentId}")
-  @Consumes("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
   public Response enableDatasourceSegment(
       @PathParam("dataSourceName") String dataSourceName,
       @PathParam("segmentId") String segmentId
@@ -403,7 +404,7 @@ public class DatasourcesResource
 
   @GET
   @Path("/{dataSourceName}/tiers")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getSegmentDataSourceTiers(
       @PathParam("dataSourceName") String dataSourceName
   )
diff --git a/server/src/main/java/io/druid/server/http/HistoricalResource.java b/server/src/main/java/io/druid/server/http/HistoricalResource.java
index a4f5956a0cc..f5326919fcf 100644
--- a/server/src/main/java/io/druid/server/http/HistoricalResource.java
+++ b/server/src/main/java/io/druid/server/http/HistoricalResource.java
@@ -7,6 +7,7 @@ import javax.inject.Inject;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
 @Path("/druid/historical/v1")
@@ -24,7 +25,7 @@ public class HistoricalResource
 
   @GET
   @Path("/loadstatus")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getLoadStatus()
   {
     return Response.ok(ImmutableMap.of("cacheInitialized", coordinator.isStarted())).build();
diff --git a/server/src/main/java/io/druid/server/http/MetadataResource.java b/server/src/main/java/io/druid/server/http/MetadataResource.java
index b14b341e2ce..f9d51e5194e 100644
--- a/server/src/main/java/io/druid/server/http/MetadataResource.java
+++ b/server/src/main/java/io/druid/server/http/MetadataResource.java
@@ -32,6 +32,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.Collections;
 import java.util.List;
@@ -53,7 +54,7 @@ public class MetadataResource
 
   @GET
   @Path("/datasources")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getDatabaseDataSources(
       @QueryParam("full") String full,
       @QueryParam("includeDisabled") String includeDisabled
@@ -88,7 +89,7 @@ public class MetadataResource
 
   @GET
   @Path("/datasources/{dataSourceName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getDatabaseSegmentDataSource(
       @PathParam("dataSourceName") final String dataSourceName
   )
@@ -103,7 +104,7 @@ public class MetadataResource
 
   @GET
   @Path("/datasources/{dataSourceName}/segments")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getDatabaseSegmentDataSourceSegments(
       @PathParam("dataSourceName") String dataSourceName,
       @QueryParam("full") String full
@@ -136,7 +137,7 @@ public class MetadataResource
 
   @GET
   @Path("/datasources/{dataSourceName}/segments/{segmentId}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getDatabaseSegmentDataSourceSegment(
       @PathParam("dataSourceName") String dataSourceName,
       @PathParam("segmentId") String segmentId
diff --git a/server/src/main/java/io/druid/server/http/RulesResource.java b/server/src/main/java/io/druid/server/http/RulesResource.java
index 03996463077..31dd63d4593 100644
--- a/server/src/main/java/io/druid/server/http/RulesResource.java
+++ b/server/src/main/java/io/druid/server/http/RulesResource.java
@@ -30,6 +30,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.List;
 
@@ -49,7 +50,7 @@ public class RulesResource
   }
 
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getRules()
   {
     return Response.ok(databaseRuleManager.getAllRules()).build();
@@ -57,7 +58,7 @@ public class RulesResource
 
   @GET
   @Path("/{dataSourceName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getDatasourceRules(
       @PathParam("dataSourceName") final String dataSourceName,
       @QueryParam("full") final String full
@@ -74,7 +75,7 @@ public class RulesResource
 
   @POST
   @Path("/{dataSourceName}")
-  @Consumes("application/json")
+  @Consumes(MediaType.APPLICATION_JSON)
   public Response setDatasourceRules(
       @PathParam("dataSourceName") final String dataSourceName,
       final List<Rule> rules
diff --git a/server/src/main/java/io/druid/server/http/ServersResource.java b/server/src/main/java/io/druid/server/http/ServersResource.java
index 3a7b325d202..cd51f4d5c44 100644
--- a/server/src/main/java/io/druid/server/http/ServersResource.java
+++ b/server/src/main/java/io/druid/server/http/ServersResource.java
@@ -35,6 +35,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.Map;
 
@@ -66,7 +67,7 @@ public class ServersResource
   }
 
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getClusterServers(
       @QueryParam("full") String full,
       @QueryParam("simple") String simple
@@ -113,7 +114,7 @@ public class ServersResource
 
   @GET
   @Path("/{serverName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getServer(
       @PathParam("serverName") String serverName,
       @QueryParam("simple") String simple
@@ -136,7 +137,7 @@ public class ServersResource
 
   @GET
   @Path("/{serverName}/segments")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getServerSegments(
       @PathParam("serverName") String serverName,
       @QueryParam("full") String full
@@ -169,7 +170,7 @@ public class ServersResource
 
   @GET
   @Path("/{serverName}/segments/{segmentId}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getServerSegment(
       @PathParam("serverName") String serverName,
       @PathParam("segmentId") String segmentId
diff --git a/server/src/main/java/io/druid/server/http/TiersResource.java b/server/src/main/java/io/druid/server/http/TiersResource.java
index 97810a7cd70..b90a5d5b4a7 100644
--- a/server/src/main/java/io/druid/server/http/TiersResource.java
+++ b/server/src/main/java/io/druid/server/http/TiersResource.java
@@ -39,6 +39,7 @@ import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
 import javax.ws.rs.Produces;
 import javax.ws.rs.QueryParam;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.util.Map;
 import java.util.Set;
@@ -59,7 +60,7 @@ public class TiersResource
   }
 
   @GET
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTiers(
       @QueryParam("simple") String simple
   )
@@ -95,7 +96,7 @@ public class TiersResource
 
   @GET
   @Path("/{tierName}")
-  @Produces("application/json")
+  @Produces(MediaType.APPLICATION_JSON)
   public Response getTierDatasources(
       @PathParam("tierName") String tierName,
       @QueryParam("simple") String simple
diff --git a/server/src/main/java/io/druid/server/sql/SQLRunner.java b/server/src/main/java/io/druid/server/sql/SQLRunner.java
index ca16426721f..2fde8adb8bd 100644
--- a/server/src/main/java/io/druid/server/sql/SQLRunner.java
+++ b/server/src/main/java/io/druid/server/sql/SQLRunner.java
@@ -50,6 +50,7 @@ import org.apache.commons.cli.HelpFormatter;
 import org.apache.commons.cli.Options;
 
 import javax.annotation.Nullable;
+import javax.ws.rs.core.MediaType;
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.net.URL;
@@ -143,7 +144,7 @@ public class SQLRunner
 
     URL url = new URL(String.format("http://%s/druid/v2/?pretty", hostname));
     final URLConnection urlConnection = url.openConnection();
-    urlConnection.addRequestProperty("content-type", "application/json");
+    urlConnection.addRequestProperty("content-type", MediaType.APPLICATION_JSON);
     urlConnection.getOutputStream().write(queryStr.getBytes(Charsets.UTF_8));
     BufferedReader stdInput = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), Charsets.UTF_8));
 
diff --git a/server/src/test/java/io/druid/server/initialization/JettyTest.java b/server/src/test/java/io/druid/server/initialization/JettyTest.java
index 710844d4d5d..917a9abfdb0 100644
--- a/server/src/test/java/io/druid/server/initialization/JettyTest.java
+++ b/server/src/test/java/io/druid/server/initialization/JettyTest.java
@@ -63,6 +63,7 @@ import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.Context;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
 import java.io.InputStream;
@@ -275,7 +276,7 @@ public class JettyTest
 
     @GET
     @Path("/hello")
-    @Produces("application/json")
+    @Produces(MediaType.APPLICATION_JSON)
     public Response hello()
     {
       try {
@@ -293,7 +294,7 @@ public class JettyTest
   {
     @GET
     @Path("/exception")
-    @Produces("application/json")
+    @Produces(MediaType.APPLICATION_JSON)
     public Response exception(
         @Context HttpServletResponse resp
     ) throws IOException