KAFKA-3286: Add plugin to quickly check for outdated dependencies

Adds a gradle task to generate a report of outdate release dependencies:
`gradle dependencyUpdates`

Updates a few minor versions.

Author: Grant Henke <granthenke@gmail.com>

Reviewers: Ismael Juma, Gwen Shapira

Closes #973 from granthenke/outdated-deps

README.md

@@ -114,6 +114,9 @@ Please note for this to work you should create/update `~/.gradle/gradle.properti
 ### Determining how transitive dependencies are added ###
     ./gradlew core:dependencies --configuration runtime
 
+### Determining if any dependencies could be updated ###
+    ./gradlew dependencyUpdates
+
 ### Running checkstyle on the java code ###
     ./gradlew checkstyleMain checkstyleTest
 

build.gradle

@@ -18,12 +18,14 @@ import org.ajoberstar.grgit.Grgit
 buildscript {
   repositories {
     mavenCentral()
+    jcenter()
   }
   apply from: file('gradle/buildscript.gradle'), to: buildscript
 
   dependencies {
     // For Apache Rat plugin to ignore non-Git files
     classpath "org.ajoberstar:grgit:1.5.0"
+    classpath 'com.github.ben-manes:gradle-versions-plugin:0.12.0'
   }
 }
 
@@ -33,6 +35,24 @@ allprojects {
   repositories {
     mavenCentral()
   }
+
+  apply plugin: 'com.github.ben-manes.versions'
+
+  dependencyUpdates {
+    revision="release"
+    resolutionStrategy = {
+      componentSelection { rules ->
+        rules.all { ComponentSelection selection ->
+          boolean rejected = ['snap', 'alpha', 'beta', 'rc', 'cr', 'm'].any { qualifier ->
+            selection.candidate.version ==~ /(?i).*[.-]${qualifier}[.\d-]*/
+          }
+          if (rejected) {
+            selection.reject('Release candidate')
+          }
+        }
+      }
+    }
+  }
 }
 
 ext {

gradle/dependencies.gradle

@@ -28,8 +28,8 @@ versions += [
   hadoop: "2.7.2",
   easymock: "3.4",
   jackson: "2.6.3",
-  jetty: "9.2.14.v20151106",
-  jersey: "2.22.1",
+  jetty: "9.2.15.v20160210",
+  jersey: "2.22.2",
   jopt: "4.9",
   junit: "4.12",
   lz4: "1.3.0",
@@ -39,7 +39,7 @@ versions += [
   rocksDB: "4.1.0",
   scalaTest: "2.2.6",
   scalaParserCombinators: "1.0.4",
-  slf4j: "1.7.15",
+  slf4j: "1.7.18",
   snappy: "1.1.2.1",
   zkclient: "0.7",
   zookeeper: "3.4.6",