I am planning to use Redis with Redisson as a caching layer between my Java app and a PostgreSQL DB. I have a table called Nodes looking like this: CREATE TABLE nodes ( node_id bigint GENERATED BY DEFAULT AS IDENTITY(START…
Is it possible to set size restriction for value in redis. For example, I want to store only values in which its size should be less than 2 MB to the redis key. value having size greater than 2 MB…
The G1GC old generation committed heap goes up over time (about 5 to 6 days on production) but the old generation used heap does not. The Eden and survivor heap is forced to decrease to the minimum (5% of the…
I'm working with Java + Spring + PHPmyadmin and pure HTML + JS on my first API and trying to understand how ajax works and the problem is that I succeded doing a POST, PUT and DELETE but when I'm…
I have a CentOS 7 VM. I recently installed 1.8.0_251 jdk version. Previous jdk version was 1.8.0_172. I inserted the following lines to a custom.sh script in /etc/profile.d/ to affect the new java version system-wide. export PATH=/usr/java/jdk1.8.0_251-amd64/bin:$PATH export JAVA_HOME="/usr/java/jdk1.8.0_251-amd64/" I…
I am on Debian 9 and am trying to install OpenJDK 8. When I enter the command sudo apt install openjdk-8-jre-headless, however, I get an error saying E: Package 'openjdk-8-jre-headless' has no installation candidate. I have installed build-essential and git,…
I am attempting to setup confluent kafka v5.4 and running the prometheus JMX exporter. I have found this blog for how to get this setup https://alex.dzyoba.com/blog/jmx-exporter/ . Kafka is setup and runs just fine but the endpoint on port 8080…
I'm very new to Java Technology (Normally working on NodeJs and PHP but got a requirement to work with Spring Boot). I just want to run 'Hello World' on Spring MVC. But I've already spent a day. I don't know…
I'm coding a little project in java, in which I want to compare the inserted password with stored sql input. Everything is hosted on my Raspberry Pi 3: Apache 2.4.37 Php 7.4.5 MariaDB 10.0 phpMyAdmin 5.0.2 The pc i'm conding…
I'm trying to use Spring Data Redis to consume a Redis Stream using consumer groups, but keep getting the following exception: Caused by: io.lettuce.core.RedisCommandExecutionException: NOGROUP No such key 'event-stream' or consumer group 'my-group' in XREADGROUP with GROUP option The message…