SpringBoot application starts org.apache.catalina.LifecycleException

Table of Contents SpringBoot application starts org.apache.catalina.LifecycleException Problem Description Cause Analysis Solution 1. Check the resources that the application depends on 2. Check application configuration 3. Check port occupancy 4. Check dependent component version compatibility 5. Check the log files Application scenario example: org.apache.catalina.LifecycleExceptionexception caused by database connection exception SpringBoot application starts org.apache.catalina.LifecycleException When developing […]

Golang standard library: bytes package – byte slice byte array convenient operation

2.2 bytes – byte slice convenient operation This package defines some convenience operations for manipulating byte slices. Because strings can be represented as []byte, the functions and methods defined by the bytes package are very similar to the strings package, so the explanation will be similar to the strings package and can even be referred […]

Word2Vec word vector analysis (word similarity) based on the character story of Genshin Impact character Keqing

First get the character text of Keqing: raw_texts = [ “Emperor Yanwang brought prosperity to Liyue Port, and his reputation for governing the world was turned into novels and biographies that people talked about. However, as one of the people closest to God, Keqing seems to be the one who lacks the least awe. \ […]

PureEdgeSim -locationmanager package -MobilityModel file

MobilityModel The main class of the mobility manager module, which generates mobility paths for different edge devices. Current device location protected Location currentLocation; Is the device moving? protected boolean isMobile = false; Minimum pause duration protected double minPauseDuration; Maximum pause duration protected double maxPauseDuration; Maximum movement duration protected double maxMobilityDuration; Minimum movement duration protected double […]

Develop your own R package

This content is excerpted from the R language special section of “Gene Academy VIP Course (Season 2)”. An R package is a collection of functions, documentation and data saved in a standard format. Packages allow us to organize our functions in a well-defined and fully documented way, and make it easy for us to share […]

recycleView (2) Grid, there is spacing in the middle, left, right, top, and bottom have no spacing

1. Function 1. Renderings The top, bottom, right and left of item are all 0 2. Code 1. Key code //Set the spacing between RecycleView items. The upper and lower spacing is 20 for sorting, and the left and right spacing is 20 for sorting. binding.rv.addItemDecoration(object : RecyclerView.ItemDecoration() {<!– –> override fun getItemOffsets(outRect: Rect, view: […]

I am learning OpenCV color space conversion in Vscode

Article directory color 【1】Color space (color gamut) (1) **RGB color space** Conversion to xyz color space Convert RGB color space to XYZ color space Convert XYZ color space to RGB color space (2) **CMYK color space** (3) **HSV** (**Hue, Saturation, Value**) color space (4) **YUV and YCbCr color space** 【2】Color space conversion 2.1 GRAY color […]

Data structure – time complexity and space complexity

1. Algorithm efficiency 1.1 Complexity of algorithm After the algorithm is written into an executable program, it takes time, resources and space to run. ( Memory ) resource . therefore Measuring the quality of an algorithm, generally Measured from two dimensions: time and space , namely time complexity and space complexity. Time complexity mainly measures […]