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New Java Articles, Especially From Red Hat

Submitted by Roy Schestowitz on Tuesday 19th of April 2022 12:47:02 PM Filed under
Development
Red Hat
  • 7 guides for developing applications on the cloud with Quarkus | Opensource.com

    Which programming language comes to your mind first for business applications development on the cloud?

    If you answered Java, I suggest you experience the benefits of Quarkus.

  • Best practices for Java in single-core containers | Red Hat Developer

    An increasing number of Java applications run in containers. The exact number is hard to determine, because adoption of containers depends upon the market segment and cloud maturity of each particular team or company. However, some data is available—for example, data from New Relic suggests that over 62% of their customers' Java workloads run in containers. Like all data points, this one is an imperfect proxy for the market as a whole, but the report demonstrates that a significant subset of the Java market has already moved to container-based environments. Anecdotal data also tells us that this migration trend is far from over.

    Teams using Java need to pay special attention to some aspects of container-based deployments and adopt a couple of best practices. This article focuses on the choice of garbage collector (GC) and how the default choice is based on available CPUs and memory.

  • Java 17: What’s new in OpenJDK's container awareness | Red Hat Developer

    OpenJDK has been aware of Linux containers (such as Docker and Podman, as well as container orchestration frameworks such as Kubernetes) for some time. By container awareness, we mean that OpenJDK detects when it is running inside a container. In this article, you'll learn why container awareness is useful, what has changed recently in that area of OpenJDK, and what diagnostic options are available to help developers gain insight into how the JVM determines settings.

    OpenJDK's container awareness detection uses Linux's control group (cgroup) filesystem to detect enforced resource quotas. As of this writing, Java 17 is the only long-term support release that supports both cgroups v1 and cgroups v2 configurations. Note, however, that there is currently work ongoing to backport cgroups v2 support to OpenJDK 11.

    OpenJDK detects whether certain resource quotas are in place when running in a container and, if so, uses those bounds for its operation. These resource limits affect, for example, the garbage collection (GC) algorithm selected by the JVM, the default size of the heap, the sizes of thread pools, and how default parallelism is determined for ForkJoinPool.

  • How to Sort an Array in Java

    In programming languages, sorting plays a very significant role as it reduces the complexities. In Java, the term sorting means arranging the elements/values in a particular order i.e. ascending or descending. If we talk about array sorting, it can be achieved using some built-in methods, user-defined methods, using loops, etc. These sorting approaches are capable of sorting any type of array such as numeric, or alphabetic.

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today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

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  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

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    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

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