Upgrade to Objenesis 2.5

(plus Groovy 2.4.8, Jackson 2.8.6, Netty 4.1.7)

Issue: SPR-15146

build.gradle

@@ -40,7 +40,7 @@ configure(allprojects) { project ->
 	ext.ejbVersion           = "3.0"
 	ext.fileuploadVersion    = "1.3.2"
 	ext.freemarkerVersion    = "2.3.23"
-	ext.groovyVersion        = "2.4.7"
+	ext.groovyVersion        = "2.4.8"
 	ext.gsonVersion          = "2.8.0"
 	ext.guavaVersion         = "20.0"
 	ext.hamcrestVersion      = "1.3"
@@ -52,7 +52,7 @@ configure(allprojects) { project ->
 	ext.hsqldbVersion        = "2.3.4"
 	ext.httpasyncVersion     = "4.1.2"
 	ext.httpclientVersion    = "4.5.2"
-	ext.jackson2Version      = "2.8.5"
+	ext.jackson2Version      = "2.8.6"
 	ext.jasperreportsVersion = "6.2.1"  // our tests fail with JR-internal NPEs against 6.2.2 and higher
 	ext.javamailVersion      = "1.5.6"
 	ext.jettyVersion         = "9.3.14.v20161028"  // as of 9.3.15, Jetty has hard Servlet 3.1 requirement
@@ -62,7 +62,7 @@ configure(allprojects) { project ->
 	ext.jtaVersion           = "1.2"
 	ext.junitVersion         = "4.12"
 	ext.log4jVersion         = "1.2.17"
-	ext.nettyVersion         = "4.1.6.Final"
+	ext.nettyVersion         = "4.1.7.Final"
 	ext.okhttpVersion        = "2.7.5"
 	ext.okhttp3Version       = "3.5.0"
 	ext.openjpaVersion       = "2.4.1"
@@ -294,7 +294,7 @@ project("spring-core") {
 	// further transformed by the JarJar task to depend on org.springframework.asm; this
 	// avoids including two different copies of asm unnecessarily.
 	def cglibVersion = "3.2.4"
-	def objenesisVersion = "2.4"
+	def objenesisVersion = "2.5"
 
 	configurations {
 		jarjar