January 2021 - Page 9 of 69

Jackson JSON Java Parser API Example Tutorial — step-by-step Programming tutorial on Progressive Robot

Jackson JSON Java Parser API Example Tutorial

URL: https://www.progressiverobot.com/jackson-json-java-parser-api-example-tutorial/ Jackson JSON Java Parser is very popular and used in Spring framework too. [Java JSON Processing API](/community/tutorials/java-json-example "Java JSON Processing API Example Tutorial") is not very user friendly and doesn't provide features for automatic transformation from Json to Java object and vice versa. Luckily we have some alternative APIs that we can use […]

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FreeBSD 12 — py39-rencode — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py39-rencode — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py39-rencode — infinite loop that could lead to Denial of Service Related CVEs: CVE-2021-40839 Upstream summary: NIST reports: The rencode package through 1.0.6 for Python allows an infinite loop in […]

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How To Configure Apache Using Ansible on Ubuntu 14.04 — step-by-step Linux tutorial on Progressive Robot

How To Configure Apache Using Ansible on Ubuntu 14.04

Ansible is an automation tool that allows you to remotely configure systems, install software, and perform complex tasks across a large fleet of servers without needing to manually log into each. This tutorial goes over how to configure Apache on a remote host using Ansible.

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How to Configure OPcache for PHP on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure OPcache for PHP on Oracle Linux 8

Introduction How to Configure OPcache for PHP on Oracle Linux 8 on Oracle Linux 8 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration […]

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Android Interview Questions And Answers — step-by-step DevOps tutorial on Progressive Robot

Android Interview Questions And Answers

Android is the most popular operating system for mobile phone. Android apps are very popular these days. Since Android is open source, it's very popular and anyone can create android apps. There are many companies working solely to create android apps. I have written a lot on Android tutorials, here I am listing some of […]

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IBM AIX 7.1 — CVE-2020-4657 — xss — patch and remediation guide — diagnosis and fix on IBM AIX 7.1

IBM AIX 7.1 — CVE-2020-4657 — xss — patch and remediation guide

🟡 Medium   ⏱ 15–45 min  Last verified: 25 May 2026 Affected versions: IBM AIX 7.1 📖 ~4 min read  •  Source: NVD CVE-2020-4657, IBM Support Bulletin CVE: CVE-2020-4657 NVD summary: IBM Sterling B2B Integrator 5.2.0.0 through 6.0.3.2 Standard Edition is vulnerable to cross-site scripting. This vulnerability allows users to embed arbitrary JavaScript code in […]

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Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2021-4356)

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4356 Related CVEs: CVE-2021-28950 CVE-2021-31916 CVE-2020-26146 CVE-2021-29646 CVE-2021-3732 CVE-2021-31829 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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