My application is running for months and working very well. Then suddenly I get the following error: com.hazelcast.core.HazelcastInstanceNotActiveException: Hazelcast instance is not active! at c...

I am using redis for pub/sub as well as for server side cache. I mean my app server has redis server running as one process (functioning as a cache as well) . I have several thin clients (running r...

I recently upgraded a spring boot application from 1.5 to 2.0.1. I also migrated the prometheus integration to the new actuator approach using micrometer. Most things work now - including some cust...

Using Hazelcast version 4.2.5 in a webapp deployed on Tomcat on Kubernetes. We're frequently("every 5 seconds") seeing ClassCastException with a stacktrace in the application logs. Here's...

I am trying to implement distributed cache using Hazelcast in my application. I am using Hazelcast’s IMap. The problem I have is every time I get a value from a map and update the value, I need to ...

I am using Hazelcast cluster cache with spring boot. I am using the 4.2 version of hazelcast. Caching is working fine but it doesn't evict the data from the cache map after TTL. Always keeping the ...

I don't get to work REST API of Hazelcast, receiving always : at client side : ERR_EMPTY_RESPONSE via Browser or java.net.SocketException: Unexpected end of file from server via a Java Test Progr...

Suppose I have instance of Hazelcast running somewhere on remote machine and it executed in official Docker image. So I wolud like to see some data that Hazelcast stores just like in the first vide...

I wanted to upgrade to Java 11 and tomcat 9 my spring boot application that uses Hazelcast 3.12.9 as cashing mechanism. When I deployed locally everything looks to work fine and the caching success...

I am using hazel cast in a 2 node cluster following is my configuration: <hz:hazelcast id="hazelcast_instance"> <hz:config> <hz:instance-name>hazelcastinstance</hz:instance-...

Question is clear as you see in the title, it would be appreciated to hear your ideas about adv./disadv. differences between them. UPDATE: I have decided to use Hazelcast because of the advantages...

I'm trying to set up a 2 machine Hazelcast cluster, and can't use multicasting. Here's my xml file I'm using for configuration: <hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/co...

I have installed HazelCast 2.5. I want to persist my records into disk. I learned that MapStore does this job. However i'm not sure how to implement MapStore. Code I've written so far: public cla...

I've found different zookeeper definitions across multiple resources. Maybe some of them are taken out of context, but look at them pls: A canonical example of Zookeeper usage is distributed-me...

I am getting below error in prod mode for (Java8+Oauth2+MySql+Hazelcast+no clustered http sessions) combination. Dev mode has worked fine. Unable to register MBean [HikariDataSource (HikariPool-0)...

We have a spring boot application running in physical boxes. Planning to migrate to EKS (AWS). We have hazelcast used for multiple purposes listed below. Is it possible to use hazelcast itself in...

Am running a OSGI plugin project (with N no of bundles), I have integrated hazel cast in it, i. When I try to add the data as map of string and test bean, It is getting added in hazel cast map bu...

Currently I have three instances registered in the CPSubsystem. ----- | I1* | * Leader ----- ---- ---- | I2 | | I3 | ---- ---- When all instances are up an running, all registered and...

I see that Hazelcast 3.12 has introduced the CPSubsystem() for systems with 3-7 nodes. I understand the reasoning. However, if I am trying to design a solution that can run with anywhere between 1-...

I am following this tutorial Vaadin microservices - High availability in order to buiild a Vaadin frontend with multiple instances providing high availability with session replication. The problem...

Hi I looking for In memory data grid or similar one. My use case. Data griding in memory. scale out available. backup node available. persistent backup available. (optional) free or openso...

I am working with Spring 4 and Hazelcast 3.2. I am trying to add a new record to existing cache with below code. somehow cache is not getting updated and at the same time I don't see any errors als...

Anyone with real-world experience of Vertx cluster managers other than Hazelcast have advice on our requirement below? For our (real time sensor data) system we have hundreds of verticles in multi...

Now we building a realtime analytics system and it should be highly distributed. We plan to use distributed locks and counters to ensure data consistency, and we need a some kind of distributed map...

We are connecting to an external Hazelcast cluster (version 3.7.2) using the Java Hazelcast client but are having issues reconnecting if the cluster goes down. We are creating our client with Haze...