Polish Generics and Update Spring Version

We needed to update Spring Version to avoid
https://jira.spring.io/browse/SPR-11471

README.adoc

@@ -203,8 +203,8 @@ public class Config {
     }
 
     @Bean
-    public SessionRepositoryFilter<RedisSession> sessionFilter(SessionRepository<RedisSession> sessionRepository) {
-        return new SessionRepositoryFilter<RedisSession>(sessionRepository);
+    public <S extends ExpiringSession> SessionRepositoryFilter<? extends ExpiringSession> sessionFilter(SessionRepository<S> sessionRepository) {
+        return new SessionRepositoryFilter<S>(sessionRepository);
     }
 }
 

gradle/java.gradle

@@ -11,7 +11,7 @@ group = 'org.springframework.session'
 ext.jstlVersion = '1.2.1'
 ext.servletApiVersion = '3.0.1'
 ext.springSecurityVersion = '3.2.4.RELEASE'
-ext.springVersion = '4.0.2.RELEASE'
+ext.springVersion = '4.1.0.RELEASE'
 ext.groovyVersion = '2.0.5'
 ext.seleniumVersion = '2.33.0'
 ext.spockVersion = '0.7-groovy-2.0'
@@ -40,6 +40,13 @@ repositories {
     maven { url 'http://clojars.org/repo' }
 }
 
+configurations.all {
+    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
+            if (details.requested.group == 'org.springframework') {
+                details.useVersion springVersion
+            }
+    }
+}
 // Integration test setup
 configurations {
     integrationTestCompile {

samples/web/src/main/java/Config.java

@@ -25,7 +25,6 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
 import org.springframework.session.ExpiringSession;
 import org.springframework.session.SessionRepository;
 import org.springframework.session.data.redis.RedisOperationsSessionRepository;
-import org.springframework.session.data.redis.RedisOperationsSessionRepository.RedisSession;
 import org.springframework.session.web.http.SessionRepositoryFilter;
 
 import redis.clients.jedis.Protocol;
@@ -80,7 +79,7 @@ public class Config {
     }
 
     @Bean
-    public SessionRepositoryFilter<RedisSession> sessionFilter(SessionRepository<RedisSession> sessionRepository) {
-        return new SessionRepositoryFilter<RedisSession>(sessionRepository);
+    public <S extends ExpiringSession> SessionRepositoryFilter<? extends ExpiringSession> sessionFilter(SessionRepository<S> sessionRepository) {
+        return new SessionRepositoryFilter<S>(sessionRepository);
     }
 }

spring-session/src/main/java/org/springframework/session/data/redis/RedisOperationsSessionRepository.java

@@ -233,7 +233,7 @@ public class RedisOperationsSessionRepository implements SessionRepository<Redis
      * @since 1.0
      * @author Rob Winch
      */
-    public final class RedisSession implements ExpiringSession {
+    final class RedisSession implements ExpiringSession {
         private final MapSession cached;
         private Map<String, Object> delta = new HashMap<String,Object>();