Fix classpaths regarding slf4j versions

- Defined global slf4jVersion as '1.6.1' in the Gradle build.

 - Replaced dependencies on slf4j-log4j12 with slf4j-jcl where possible;
   however, spring-test-mvc still depends on jcl-over-slf4j and
   slf4j-log4j12 (see SPR-10070).

 - Reenabled HibernateSessionFlushingTests.

 - Verified that the following tests pass in the Gradle build and within
   Eclipse:
   - HibernateSessionFlushingTests
   - HibernateTransactionManagerTests (Hibernate 3)
   - HibernateTransactionManagerTests (Hibernate 4)
   - RequestResponseBodyMethodProcessorTests

Issue: SPR-9421, SPR-10066

build.gradle

@@ -10,11 +10,12 @@ buildscript {
 }
 
 configure(allprojects) {
-    ext.aspectjVersion = '1.6.12'
-    ext.easymockVersion='2.5.2'
-    ext.hsqldbVersion='1.8.0.10'
-    ext.junitVersion = '4.11.20120805.1225' // temporary use of snapshot; spring-test
-                                            // still builds against 4.10
+    ext.aspectjVersion  = '1.6.12'
+    ext.easymockVersion = '2.5.2'
+    ext.hsqldbVersion   = '1.8.0.10'
+    ext.junitVersion    = '4.11.20120805.1225' // temporary use of snapshot;
+                                               // spring-test still builds against 4.10
+    ext.slf4jVersion    = '1.6.1'
     ext.gradleScriptDir = "${rootProject.projectDir}/gradle"
 
     apply plugin: 'java'
@@ -256,7 +257,7 @@ project('spring-context') {
         compile("org.codehaus.groovy:groovy-all:1.8.8", optional)
         compile("org.jruby:jruby:1.6.5.1", optional)
         compile("joda-time:joda-time:2.1", optional)
-        compile("org.slf4j:slf4j-api:1.6.1", optional)
+        compile("org.slf4j:slf4j-api:${slf4jVersion}", optional)
         compile("org.hibernate:hibernate-validator:4.3.0.Final") { dep ->
             optional dep
             exclude group: 'org.slf4j', module: 'slf4j-api'
@@ -425,7 +426,7 @@ project('spring-orm') {
         compile("javax.jdo:jdo-api:3.0", optional)
         compile("org.apache.ibatis:ibatis-sqlmap:2.3.4.726", optional)
         testCompile "javax.servlet:servlet-api:2.5"
-        testCompile "org.slf4j:slf4j-jcl:1.6.1"
+        testCompile "org.slf4j:slf4j-jcl:${slf4jVersion}"
         testCompile "commons-dbcp:commons-dbcp:1.2.2"
         testCompile "org.eclipse.persistence:org.eclipse.persistence.asm:1.0.1"
         testCompile "org.eclipse.persistence:org.eclipse.persistence.antlr:1.0.1"
@@ -487,9 +488,7 @@ project('spring-webmvc') {
         compile("javax.servlet:jstl:1.1.2", provided)
         compile("org.apache.tomcat:tomcat-servlet-api:7.0.32", provided) // servlet-api 3.0
         testCompile project(":spring-aop")
-        testCompile("org.slf4j:slf4j-log4j12:1.6.1") {
-            exclude group: 'log4j', module: 'log4j'
-        }
+        testCompile "org.slf4j:slf4j-jcl:${slf4jVersion}"
         testCompile "rhino:js:1.7R1"
         testCompile "xmlunit:xmlunit:1.2"
         testCompile("dom4j:dom4j:1.6.1") {
@@ -570,7 +569,7 @@ project('spring-test') {
         compile("javax.servlet.jsp:jsp-api:2.1", optional)
         compile("javax.portlet:portlet-api:2.0", optional)
         compile("javax.activation:activation:1.0", provided)
-        testCompile "org.slf4j:slf4j-jcl:1.5.3"
+        testCompile "org.slf4j:slf4j-jcl:${slf4jVersion}"
     }
 }
 
@@ -587,8 +586,8 @@ project('spring-test-mvc') {
         compile("org.hamcrest:hamcrest-core:1.3", optional)
         compile("com.jayway.jsonpath:json-path:0.8.1", optional)
         compile("xmlunit:xmlunit:1.2", optional)
-        testCompile("org.slf4j:jcl-over-slf4j:1.6.1")
-        testCompile("org.slf4j:slf4j-log4j12:1.6.1") {
+        testCompile("org.slf4j:jcl-over-slf4j:${slf4jVersion}")
+        testCompile("org.slf4j:slf4j-log4j12:${slf4jVersion}") {
             exclude group: 'log4j', module: 'log4j'
         }
         testCompile("log4j:log4j:1.2.15") {

spring-test/src/test/java/org/springframework/test/context/junit4/orm/HibernateSessionFlushingTests.java

@@ -23,8 +23,10 @@ import static org.springframework.test.transaction.TransactionTestUtils.assertIn
 import org.hibernate.SessionFactory;
 import org.hibernate.exception.ConstraintViolationException;
 import org.hibernate.exception.GenericJDBCException;
+
 import org.junit.Before;
 import org.junit.Test;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.AbstractTransactionalJUnit4SpringContextTests;
@@ -39,7 +41,6 @@ import org.springframework.test.context.junit4.orm.service.PersonService;
  * @author Sam Brannen
  * @since 3.0
  */
-@org.junit.Ignore // TODO SPR-8116 (Hibernate classpath-related)
 @ContextConfiguration
 public class HibernateSessionFlushingTests extends AbstractTransactionalJUnit4SpringContextTests {