The last two nights of an online system crash, after opening the online error log immediately, only a meaningless stack of program calls (traceback) output was obtained, and the team members were caught in a lengthy and confusing problem-solving process.Fortunately, the problem was resolved, but I have been wondering why the call sta ...
Posted on Sat, 21 Sep 2019 10:04:14 -0700 by will
When I first came into contact with Cache, it was in WebForm. When I first came into contact with Cache, I never forgot that cache was the Pinyin for car cleaning.
Client Browser Cache https://blog.csdn.net/y874961524/article/details/61419716
CDN Caching Principle https://www.cnblogs.com/shijingxiang/articles/5179032.html
Aliyun CDN Open Set ...
Posted on Sat, 21 Sep 2019 07:43:45 -0700 by notsleepy
AC //this cannot be used in the static method, so D error; in the static initialization block, non-static members can not be directly accessed, so A is correct.
BC // non-static methods must be called by object. method name, which can not be called directly, so B erro ...
Posted on Sat, 21 Sep 2019 07:15:57 -0700 by spetstnelis
Python is one of the most popular languages. It is widely used in data science, machine learning, web development, scripting and automation. Its simplicity and ease of use make it so popular.
In this article, we will introduce 30 short code snippets that you can understand and learn in 30 seconds or less.
1. Check duplicate elements
The followi ...
Posted on Sat, 21 Sep 2019 03:46:55 -0700 by BVis
Database Connection Pool Selection Algorithms
By default, database connections can be automatically configured using the DataSource pool. The following is an algorithm for selecting a specific implementation:
Because of the performance and concurrency of Tomcat's data source connection pool, we always give preference to Tomcat when it is avail ...
Posted on Sat, 21 Sep 2019 03:08:51 -0700 by bashaash
The main upgrades from 2.0 to 3.0 are:
Upgrading JDK 8 + Optimizing Performance Wrapper Support lambda Syntax
Modular MP allocates each package structure reasonably
Reconstructing injection method to support any method to simplify injection mode
Global Configuration Underline Conversion Eliminates Injection of AS Statements
Modify Wrapper to Q ...
Posted on Sat, 21 Sep 2019 03:06:18 -0700 by alconebay
I remember when I was in love with my wife, one day I came to cook for my wife with a whim, and did it step by step according to the recipe. As a result, I almost burned the kitchen!!! My wife still remembers this.
As mentioned in the previous article, the main process of AbstractBeanFactory.getBean. Today, let's talk about the createB ...
Posted on Sat, 21 Sep 2019 02:59:19 -0700 by boiy
Introduction to ReentrantLock
Basic knowledge paving
Thread Holder Properties
Queue usage in ReentrantLock
Demo & Principle Analysis
Fair lock() method
Vernacular Principles (Interview Oral)
Vernacular Pr ...
Posted on Sat, 21 Sep 2019 02:12:36 -0700 by stubarny
A common use of selenium is to skip login through cookie s and to verify images / text messages / validation codes, etc., to be in the login state directly.
It seems simple, but there are always problems with cookie s.
First of all, we tested it with bean flakes. The whole idea is:
1. First use se ...
Posted on Sat, 21 Sep 2019 01:12:51 -0700 by dubrubru
If the article is wrong, please comment downstairs, thank you for your positive correction! Learn together and become a big man!
2. Advanced mapping (mapping between entity classes and database table fields) allows you to manipulate entity classes in subsequent development without paying attention to the database. (In fa ...
Posted on Sat, 21 Sep 2019 00:41:32 -0700 by pramodv