Merge pull request #2070 from jchobantonov/master

when using findSession check if the session exists in Redis first before creating a new one - a fix for #2019

redisson-tomcat/redisson-tomcat-6/src/main/java/org/redisson/tomcat/RedissonSessionManager.java

@@ -187,6 +187,11 @@ public class RedissonSessionManager extends ManagerBase implements Lifecycle {
                 } catch (Exception e) {
                     log.error("Can't read session object by id: " + id, e);
                 }
+
+                if (attrs.isEmpty()) {	
+                    log.info("Session " + id + " can't be found");
+                    return null;	
+                }
                 
                 RedissonSession session = (RedissonSession) createEmptySession();
                 session.load(attrs);

redisson-tomcat/redisson-tomcat-7/src/main/java/org/redisson/tomcat/RedissonSessionManager.java

@@ -166,6 +166,11 @@ public class RedissonSessionManager extends ManagerBase {
                 } catch (Exception e) {
                     log.error("Can't read session object by id: " + id, e);
                 }
+
+                if (attrs.isEmpty()) {	
+                    log.info("Session " + id + " can't be found");
+                    return null;	
+                }
                 
                 RedissonSession session = (RedissonSession) createEmptySession();
                 session.load(attrs);

redisson-tomcat/redisson-tomcat-8/src/main/java/org/redisson/tomcat/RedissonSessionManager.java

@@ -165,7 +165,12 @@ public class RedissonSessionManager extends ManagerBase {
                 } catch (Exception e) {
                     log.error("Can't read session object by id: " + id, e);
                 }
-                
+
+                if (attrs.isEmpty()) {	
+                    log.info("Session " + id + " can't be found");
+                    return null;	
+                }
+
                 RedissonSession session = (RedissonSession) createEmptySession();
                 session.load(attrs);
                 session.setId(id);

redisson-tomcat/redisson-tomcat-9/src/main/java/org/redisson/tomcat/RedissonSessionManager.java

@@ -165,6 +165,11 @@ public class RedissonSessionManager extends ManagerBase {
                 } catch (Exception e) {
                     log.error("Can't read session object by id: " + id, e);
                 }
+
+                if (attrs.isEmpty()) {	
+                    log.info("Session " + id + " can't be found");
+                    return null;	
+                }
                 
                 RedissonSession session = (RedissonSession) createEmptySession();
                 session.load(attrs);