diff --git a/build.gradle b/build.gradle
index 9738411..e35d5a2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,17 +1,17 @@
 buildscript {
     repositories { jcenter() }
     dependencies {
-        classpath 'com.netflix.nebula:nebula-publishing-plugin:4.4.4'
+        classpath 'com.netflix.nebula:nebula-publishing-plugin:4.7.0'
     }
 }
 
 plugins {
-    id 'nebula.dependency-recommender' version '3.1.0'
-    id 'nebula.dependency-lock' version '4.2.0'
+    id 'nebula.dependency-recommender' version '3.3.0'
+    id 'nebula.dependency-lock' version '4.3.0'
     id 'nebula.nebula-release' version '4.0.1'
     id 'nebula.contacts' version '3.0.1'
-    id 'nebula.info' version '3.0.3'
-    id 'nebula.nebula-bintray' version '3.3.4'
+    id 'nebula.info' version '3.1.0'
+    id 'nebula.nebula-bintray' version '3.4.0'
     id "org.standardout.versioneye" version '1.4.0'
 }
 
@@ -30,6 +30,10 @@ apply plugin: 'build-dashboard'
 group 'com.github.kennedyoliveira'
 description = 'Implementation of a Metrics Event Stream using Vert.x'
 
+pmd {
+    toolVersion = '5.4.2'
+}
+
 def recomendationsFile = rootProject.file('dependencies-version.properties')
 
 dependencyRecommendations {
diff --git a/dependencies-version.properties b/dependencies-version.properties
index d0c0811..21eece6 100644
--- a/dependencies-version.properties
+++ b/dependencies-version.properties
@@ -5,8 +5,8 @@ VERTX_VERSION=3.2.+
 com.netflix.hystrix:hystrix-core=$HYSTRIX_VERSION
 
 # Json Deps
-org.codehaus.jackson:jackson-core-asl=1.9.+
-org.codehaus.jackson:jackson-mapper-asl=1.9.+
+org.codehaus.jackson:jackson-core-asl= 1.9.13
+org.codehaus.jackson:jackson-mapper-asl= 1.9.13
 
 # Vert.x
 io.vertx:vertx-core=$VERTX_VERSION
diff --git a/dependencies.lock b/dependencies.lock
index 1fb0fca..4d43b7f 100644
--- a/dependencies.lock
+++ b/dependencies.lock
@@ -10,10 +10,10 @@
             "locked": "3.2.1"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "compileClasspath": {
@@ -27,10 +27,10 @@
             "locked": "3.2.1"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "compileOnly": {
@@ -44,10 +44,10 @@
             "locked": "3.2.1"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "default": {
@@ -61,10 +61,10 @@
             "locked": "3.2.1"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "findbugs": {
@@ -74,7 +74,7 @@
     },
     "pmd": {
         "net.sourceforge.pmd:pmd-java": {
-            "locked": "5.2.3"
+            "locked": "5.4.2"
         }
     },
     "runtime": {
@@ -88,10 +88,10 @@
             "locked": "3.2.1"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "testCompile": {
@@ -111,10 +111,10 @@
             "locked": "4.12"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "testCompileClasspath": {
@@ -134,10 +134,10 @@
             "locked": "4.12"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "testCompileOnly": {
@@ -157,10 +157,10 @@
             "locked": "4.12"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     },
     "testRuntime": {
@@ -180,10 +180,10 @@
             "locked": "4.12"
         },
         "org.codehaus.jackson:jackson-core-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         },
         "org.codehaus.jackson:jackson-mapper-asl": {
-            "locked": "1.9.11"
+            "locked": "1.9.13"
         }
     }
 }
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..eacae00
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1 @@
+versioneye.projectid=56f0d26335630e0029daff48
\ No newline at end of file
diff --git a/src/main/java/com/github/kennedyoliveira/hystrix/contrib/vertx/metricsstream/JsonMappers.java b/src/main/java/com/github/kennedyoliveira/hystrix/contrib/vertx/metricsstream/JsonMappers.java
index 12fd025..112a1bd 100644
--- a/src/main/java/com/github/kennedyoliveira/hystrix/contrib/vertx/metricsstream/JsonMappers.java
+++ b/src/main/java/com/github/kennedyoliveira/hystrix/contrib/vertx/metricsstream/JsonMappers.java
@@ -174,12 +174,7 @@ static String toJson(final HystrixThreadPoolMetrics threadPoolMetrics) throws IO
     json.writeNumberField("currentTaskCount", threadPoolMetrics.getCurrentTaskCount().longValue());
     json.writeNumberField("rollingCountThreadsExecuted", threadPoolMetrics.getRollingCountThreadsExecuted());
     json.writeNumberField("rollingMaxActiveThreads", threadPoolMetrics.getRollingMaxActiveThreads());
-    safelyWriteNumberField(json, "rollingCountCommandsRejected", new Func0<Long>() {
-      @Override
-      public Long call() {
-        return threadPoolMetrics.getRollingCount(HystrixRollingNumberEvent.THREAD_POOL_REJECTED);
-      }
-    });
+    safelyWriteNumberField(json, "rollingCountCommandsRejected", () -> threadPoolMetrics.getRollingCount(HystrixRollingNumberEvent.THREAD_POOL_REJECTED));
     json.writeNumberField("propertyValue_queueSizeRejectionThreshold", threadPoolMetrics.getProperties().queueSizeRejectionThreshold().get());
     json.writeNumberField("propertyValue_metricsRollingStatisticalWindowInMilliseconds", threadPoolMetrics.getProperties().metricsRollingStatisticalWindowInMilliseconds().get());
 
@@ -201,24 +196,9 @@ static String toJson(final HystrixCollapserMetrics collapserMetrics) throws IOEx
     json.writeStringField("name", key.name());
     json.writeNumberField("currentTime", System.currentTimeMillis());
 
-    safelyWriteNumberField(json, "rollingCountRequestsBatched", new Func0<Long>() {
-      @Override
-      public Long call() {
-        return collapserMetrics.getRollingCount(HystrixRollingNumberEvent.COLLAPSER_REQUEST_BATCHED);
-      }
-    });
-    safelyWriteNumberField(json, "rollingCountBatches", new Func0<Long>() {
-      @Override
-      public Long call() {
-        return collapserMetrics.getRollingCount(HystrixRollingNumberEvent.COLLAPSER_BATCH);
-      }
-    });
-    safelyWriteNumberField(json, "rollingCountResponsesFromCache", new Func0<Long>() {
-      @Override
-      public Long call() {
-        return collapserMetrics.getRollingCount(HystrixRollingNumberEvent.RESPONSE_FROM_CACHE);
-      }
-    });
+    safelyWriteNumberField(json, "rollingCountRequestsBatched", () -> collapserMetrics.getRollingCount(HystrixRollingNumberEvent.COLLAPSER_REQUEST_BATCHED));
+    safelyWriteNumberField(json, "rollingCountBatches", () -> collapserMetrics.getRollingCount(HystrixRollingNumberEvent.COLLAPSER_BATCH));
+    safelyWriteNumberField(json, "rollingCountResponsesFromCache", () -> collapserMetrics.getRollingCount(HystrixRollingNumberEvent.RESPONSE_FROM_CACHE));
 
     // batch size percentiles
     json.writeNumberField("batchSize_mean", collapserMetrics.getBatchSizeMean());