71 posts
The entire organization can be commanded up and down through the mysterious API department. It speaks multiple official languages: REST API and GraphQL API. We'll start with REST. Before we begin, we need to apply for a token on JH GitLab — only a valid token lets you issue commands to this mysterious API department.
You're so eager to learn, fine, I'll tell you: our JH GitLab association can audit vulnerabilities for you too. In the Security Hall there are security masters who can scan the manual you wrote, covering Static Application Security Testing (SAST), Infrastructure as Code (IaC) scanning, Dynamic Application Security Testing (DAST), dependency scanning, container scanning, and more.
Xiaobai was strolling around JH GitLab when he ran into the Chief again and hurriedly stopped him: you said you'd teach me Docker cache optimization last time, tell me now. Chief: fine, you're eager to learn. Do you know our JH GitLab association has a Package Warehouse for managing artifacts? Xiaobai: of course, I've just never used it. How does it work?
Xiaobai has been wandering the jianghu for years. He heard that the leader of the Tianxia Hui is unmatched in martial arts, his Three-Part Return-to-Origin Qi (DevOps, DevSecOps, GitOps) invincible under heaven. One day he saw that JH GitLab Tianxia Hui was sending out hero invitations, recruiting Jihu heroes to join the internal testing hall and start training.
To understand why Optional exists, you first need to understand NPE. Many object-oriented languages have a null value: a pointer on the stack that points at a heap address that doesn't exist. Use that object and you get a NullPointerException. If you fail to anticipate the null case, your program crashes.
This post uses the IP2Location LITE database and queries it by reading the BIN file directly. The code is a trimmed-down version of the official sample, published to Maven Central.
Google has long supported proactive URL submission, but it's not a point-and-click UI for ordinary users — it's an API for programmers. Plenty of webmasters aren't developers, and since Google requires ownership verification, I can't just build a UI where people paste their own private key. Instead I wrapped Google's API to make it easier to use.
Last time we learned synchronized thread coordination, which is enough to build real things — the most classic being the producer-consumer model. One producer keeps making resources, one consumer keeps taking them, two threads simulating that relationship, like a chef and a server: the chef keeps cooking, and the server takes the dish away once it's plated.
Anyone who's touched multithreading has heard the synchronized keyword. We'll start with a broken example to show what happens without it, fix it with synchronized, and then let synchronized lead us into deadlock.
Let's be clear about this: Java threads have 6 states. Online — including the copy-paste crowd on CSDN who mindlessly repost who-knows-what — everyone says 5. I went and read the docs myself, and I'm certain it's 6.
