Merge pull request #3118 from rgrig/master

Fix in RedissonExecutorService

redisson/src/main/java/org/redisson/RedissonExecutorService.java

@@ -422,6 +422,8 @@ public class RedissonExecutorService implements RScheduledExecutorService {
                 try {
                     ObjectOutput oo = new ObjectOutputStream(os);
                     oo.writeObject(task);
+                    oo.flush();
+                    oo.close();
                 } catch (Exception e) {
                     throw new IllegalArgumentException("Unable to serialize lambda", e);
                 }